commit 934566879ea9d9cbf0a050fd4e15716aa90b353f
Author: rob thijssen <grenade@rob.tn>
Date:   Mon Mar 9 10:15:33 2026 +0200

    chore: init

diff --git a/.gitignore b/.gitignore
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index 0000000..ea8c4bf
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diff --git a/Cargo.lock b/Cargo.lock
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+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b97154e67e32c85465826e8bcc1c59429aaaf107c1e4a9e53c8d8ccd5eff88d0"
+
+[[package]]
+name = "zerotrie"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a59c17a5562d507e4b54960e8569ebee33bee890c70aa3fe7b97e85a9fd7851"
+dependencies = [
+ "displaydoc",
+ "yoke",
+ "zerofrom",
+]
+
+[[package]]
+name = "zerovec"
+version = "0.11.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c28719294829477f525be0186d13efa9a3c602f7ec202ca9e353d310fb9a002"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eadce39539ca5cb3985590102671f2567e659fca9666581ad3411d59207951f3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..7b9cd43
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "scout"
+version = "0.1.0"
+edition = "2021"
+description = "Autonomous strategy search agent for swym backtesting platform"
+
+[dependencies]
+anyhow = "1"
+chrono = { version = "0.4", features = ["serde"] }
+clap = { version = "4", features = ["derive"] }
+reqwest = { version = "0.12", features = ["json", "rustls-tls"], default-features = false }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tokio = { version = "1", features = ["full"] }
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+uuid = { version = "1", features = ["serde"] }
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..387a5bd
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,93 @@
+# scout
+
+Autonomous strategy search agent for the [swym](https://swym.rs) backtesting platform.
+
+Runs a loop: asks Claude to generate trading strategies → submits backtests to swym →
+evaluates results → feeds learnings back → repeats. Promising strategies are automatically
+validated on out-of-sample data to filter overfitting.
+
+## Quick start
+
+```bash
+export ANTHROPIC_API_KEY="sk-ant-..."
+
+cargo run -- \
+  --swym-url https://dev.swym.hanzalova.internal/api/v1 \
+  --max-iterations 50 \
+  --instruments binance_spot:BTCUSDC,binance_spot:ETHUSDC,binance_spot:SOLUSDC \
+  --backtest-from 2025-01-01T00:00:00Z \
+  --backtest-to 2025-10-01T00:00:00Z \
+  --oos-from 2025-10-01T00:00:00Z \
+  --oos-to 2026-03-01T00:00:00Z
+```
+
+## How it works
+
+1. **Coverage check** — verifies candle data exists for all instruments and finds
+   common available intervals.
+
+2. **Strategy generation** — sends the DSL schema + prior results to Claude, which
+   produces a new strategy JSON each iteration.
+
+3. **In-sample backtest** — submits the strategy against all instruments for the
+   training period. Evaluates Sharpe ratio, profit factor, win rate, net PnL.
+
+4. **Out-of-sample validation** — if any instrument shows Sharpe > threshold with
+   enough trades, the strategy is re-tested on held-out data. Only strategies that
+   pass both phases are saved as "validated".
+
+5. **Learning loop** — all results (including failures) are fed back to Claude so
+   it can learn from what works and what doesn't. The conversation is trimmed to
+   avoid context exhaustion while the full results history is passed as structured
+   text.
+
+## Configuration
+
+All options are available as CLI flags and environment variables:
+
+| Flag | Env | Default | Description |
+|------|-----|---------|-------------|
+| `--swym-url` | `SWYM_API_URL` | `https://dev.swym.hanzalova.internal/api/v1` | Swym API base URL |
+| `--anthropic-key` | `ANTHROPIC_API_KEY` | required | Anthropic API key |
+| `--model` | `CLAUDE_MODEL` | `claude-sonnet-4-20250514` | Claude model |
+| `--max-iterations` | | `50` | Maximum search iterations |
+| `--min-sharpe` | | `1.0` | Minimum Sharpe for "promising" |
+| `--min-trades` | | `10` | Minimum trades for significance |
+| `--instruments` | | BTC,ETH,SOL vs USDC | Comma-separated exchange:SYMBOL |
+| `--backtest-from` | | `2025-01-01` | In-sample start |
+| `--backtest-to` | | `2025-10-01` | In-sample end |
+| `--oos-from` | | `2025-10-01` | Out-of-sample start |
+| `--oos-to` | | `2026-03-01` | Out-of-sample end |
+| `--initial-balance` | | `10000` | Starting USDC balance |
+| `--fees-percent` | | `0.001` | Fee per trade (0.1%) |
+| `--output-dir` | | `./results` | Where to save strategies and reports |
+
+## Output
+
+```
+results/
+├── strategy_001.json      # Every strategy attempted
+├── strategy_002.json
+├── ...
+├── validated_017.json     # Strategies that passed OOS validation
+├── validated_031.json     # (includes in-sample + OOS metrics)
+└── best_strategy.json     # Highest avg Sharpe across instruments
+```
+
+## Tips
+
+- **Start with Sonnet** (`claude-sonnet-4-20250514`) for cost efficiency during
+  exploration. Switch to Opus for refinement of promising strategies.
+
+- **50 iterations** is a reasonable starting point. The agent typically finds
+  interesting patterns within 20-30 iterations if they exist.
+
+- **Watch the logs** — the per-iteration summaries show you what the agent is
+  learning in real time.
+
+- **Adjust dates** to match your actual candle coverage. The agent checks coverage
+  at startup and will fail fast if data is missing.
+
+- **The OOS validation threshold is intentionally relaxed** (70% of in-sample
+  Sharpe, half the trade count) because out-of-sample degradation is expected.
+  Strategies that maintain edge through this filter are genuinely interesting.
diff --git a/src/agent.rs b/src/agent.rs
new file mode 100644
index 0000000..923a36e
--- /dev/null
+++ b/src/agent.rs
@@ -0,0 +1,420 @@
+use std::path::Path;
+use std::time::Duration;
+
+use anyhow::{Context, Result};
+use serde_json::Value;
+use tracing::{error, info, warn};
+
+use crate::claude::{self, ClaudeClient, Message};
+use crate::config::{Cli, Instrument};
+use crate::prompts;
+use crate::swym::{BacktestResult, SwymClient};
+
+/// A single iteration's record: strategy + results across instruments.
+#[derive(Debug)]
+struct IterationRecord {
+    iteration: u32,
+    strategy: Value,
+    results: Vec<BacktestResult>,
+}
+
+impl IterationRecord {
+    fn best_sharpe(&self) -> f64 {
+        self.results
+            .iter()
+            .filter_map(|r| r.sharpe_ratio)
+            .fold(f64::NEG_INFINITY, f64::max)
+    }
+
+    fn avg_sharpe(&self) -> f64 {
+        let sharpes: Vec<f64> = self.results.iter().filter_map(|r| r.sharpe_ratio).collect();
+        if sharpes.is_empty() {
+            return f64::NEG_INFINITY;
+        }
+        sharpes.iter().sum::<f64>() / sharpes.len() as f64
+    }
+
+    fn summary(&self) -> String {
+        let mut lines = vec![format!("=== Iteration {} ===", self.iteration)];
+        for r in &self.results {
+            lines.push(r.summary_line());
+        }
+        lines.push(format!(
+            "  avg_sharpe={:.3} best_sharpe={:.3}",
+            self.avg_sharpe(),
+            self.best_sharpe()
+        ));
+        lines.join("\n")
+    }
+}
+
+pub async fn run(cli: &Cli) -> Result<()> {
+    // Parse instruments
+    let instruments: Vec<Instrument> = cli
+        .instruments
+        .iter()
+        .map(|s| Instrument::parse(s))
+        .collect::<Result<_>>()?;
+
+    // Ensure output directory exists
+    std::fs::create_dir_all(&cli.output_dir)?;
+
+    // Init clients
+    let swym = SwymClient::new(&cli.swym_url)?;
+    let claude = ClaudeClient::new(&cli.anthropic_key, &cli.model);
+
+    // Check candle coverage for all instruments
+    info!(
+        "checking candle coverage for {} instruments...",
+        instruments.len()
+    );
+    let mut available_intervals: Vec<String> = Vec::new();
+    for inst in &instruments {
+        match swym.candle_coverage(&inst.exchange, &inst.symbol).await {
+            Ok(coverage) => {
+                let intervals: Vec<&str> = coverage.iter().map(|c| c.interval.as_str()).collect();
+                info!("{}: intervals {:?}", inst.symbol, intervals);
+                if available_intervals.is_empty() {
+                    available_intervals = coverage.iter().map(|c| c.interval.clone()).collect();
+                } else {
+                    // Intersect — only keep intervals available for ALL instruments
+                    available_intervals.retain(|iv| intervals.contains(&iv.as_str()));
+                }
+            }
+            Err(e) => {
+                warn!("could not check coverage for {}: {e}", inst.symbol);
+            }
+        }
+    }
+    if available_intervals.is_empty() {
+        anyhow::bail!("no common candle intervals available across all instruments");
+    }
+    info!("common intervals: {:?}", available_intervals);
+
+    // Load DSL schema for the system prompt
+    let schema = include_str!("dsl-schema.json");
+    let system = prompts::system_prompt(schema);
+
+    // Agent state
+    let mut history: Vec<IterationRecord> = Vec::new();
+    let mut conversation: Vec<Message> = Vec::new();
+    let mut best_strategy: Option<(f64, Value)> = None; // (avg_sharpe, strategy)
+    let mut consecutive_failures = 0u32;
+
+    let instrument_names: Vec<String> = instruments.iter().map(|i| i.symbol.clone()).collect();
+
+    for iteration in 1..=cli.max_iterations {
+        info!("━━━ iteration {}/{} ━━━", iteration, cli.max_iterations);
+
+        // Build the user prompt
+        let user_msg = if iteration == 1 {
+            prompts::initial_prompt(&instrument_names, &available_intervals)
+        } else {
+            let results_text = history
+                .iter()
+                .map(|r| r.summary())
+                .collect::<Vec<_>>()
+                .join("\n\n");
+
+            let best_json = best_strategy
+                .as_ref()
+                .map(|(_, v)| serde_json::to_string_pretty(v).unwrap());
+
+            prompts::iteration_prompt(iteration, &results_text, best_json.as_deref())
+        };
+
+        conversation.push(Message {
+            role: "user".to_string(),
+            content: user_msg,
+        });
+
+        // Ask Claude for a strategy
+        info!("requesting strategy from Claude...");
+        let (response_text, usage) = match claude.chat(&system, &conversation).await {
+            Ok(r) => r,
+            Err(e) => {
+                error!("Claude API error: {e}");
+                consecutive_failures += 1;
+                if consecutive_failures >= 3 {
+                    error!("3 consecutive failures, aborting");
+                    break;
+                }
+                // Remove the last user message so we can retry
+                conversation.pop();
+                continue;
+            }
+        };
+
+        if let Some(u) = &usage {
+            info!(
+                "tokens: in={} out={}",
+                u.input_tokens.unwrap_or(0),
+                u.output_tokens.unwrap_or(0)
+            );
+        }
+
+        // Add assistant response to conversation history
+        conversation.push(Message {
+            role: "assistant".to_string(),
+            content: response_text.clone(),
+        });
+
+        // Extract strategy JSON
+        let strategy = match claude::extract_json(&response_text) {
+            Ok(s) => s,
+            Err(e) => {
+                warn!("failed to extract strategy JSON: {e}");
+                warn!(
+                    "raw response: {}",
+                    &response_text[..response_text.len().min(500)]
+                );
+                consecutive_failures += 1;
+                if consecutive_failures >= 3 {
+                    error!("3 consecutive JSON extraction failures, aborting");
+                    break;
+                }
+                continue;
+            }
+        };
+
+        consecutive_failures = 0;
+
+        // Validate basic structure
+        if strategy.get("type").and_then(|v| v.as_str()) != Some("rule_based") {
+            warn!("strategy missing type=rule_based, skipping");
+            continue;
+        }
+
+        info!(
+            "strategy: interval={}, rules={}",
+            strategy["candle_interval"].as_str().unwrap_or("?"),
+            strategy["rules"].as_array().map(|r| r.len()).unwrap_or(0)
+        );
+
+        // Save the strategy JSON
+        let strat_path = cli.output_dir.join(format!("strategy_{iteration:03}.json"));
+        std::fs::write(&strat_path, serde_json::to_string_pretty(&strategy)?)?;
+
+        // Run backtests against all instruments (in-sample)
+        let mut results: Vec<BacktestResult> = Vec::new();
+
+        for inst in &instruments {
+            info!("backtesting {} on {}...", inst.symbol, cli.backtest_from);
+            match run_single_backtest(
+                &swym,
+                inst,
+                &strategy,
+                &cli.backtest_from,
+                &cli.backtest_to,
+                &cli.initial_balance,
+                &cli.fees_percent,
+                cli.poll_interval_secs,
+                cli.backtest_timeout_secs,
+            )
+            .await
+            {
+                Ok(result) => {
+                    info!("  {}", result.summary_line());
+                    results.push(result);
+                }
+                Err(e) => {
+                    warn!("  backtest failed for {}: {e}", inst.symbol);
+                    results.push(BacktestResult {
+                        run_id: uuid::Uuid::nil(),
+                        instrument: inst.symbol.clone(),
+                        status: "failed".to_string(),
+                        total_positions: None,
+                        winning_positions: None,
+                        losing_positions: None,
+                        win_rate: None,
+                        profit_factor: None,
+                        total_pnl: None,
+                        net_pnl: None,
+                        sharpe_ratio: None,
+                        total_fees: None,
+                        avg_bars_in_trade: None,
+                        error_message: Some(e.to_string()),
+                        condition_audit_summary: None,
+                    });
+                }
+            }
+        }
+
+        let record = IterationRecord {
+            iteration,
+            strategy: strategy.clone(),
+            results,
+        };
+
+        info!("{}", record.summary());
+
+        // Check if any result is promising → run out-of-sample validation
+        let promising_instruments: Vec<&BacktestResult> = record
+            .results
+            .iter()
+            .filter(|r| r.is_promising(cli.min_sharpe, cli.min_trades))
+            .collect();
+
+        if !promising_instruments.is_empty() {
+            info!(
+                "🎯 promising on {} instrument(s)! running out-of-sample validation...",
+                promising_instruments.len()
+            );
+
+            let mut oos_results: Vec<BacktestResult> = Vec::new();
+            for inst in &instruments {
+                match run_single_backtest(
+                    &swym,
+                    inst,
+                    &strategy,
+                    &cli.oos_from,
+                    &cli.oos_to,
+                    &cli.initial_balance,
+                    &cli.fees_percent,
+                    cli.poll_interval_secs,
+                    cli.backtest_timeout_secs,
+                )
+                .await
+                {
+                    Ok(result) => {
+                        info!("  OOS {}", result.summary_line());
+                        oos_results.push(result);
+                    }
+                    Err(e) => {
+                        warn!("  OOS backtest failed for {}: {e}", inst.symbol);
+                    }
+                }
+            }
+
+            // Check if out-of-sample results confirm the edge
+            let oos_promising: Vec<&BacktestResult> = oos_results
+                .iter()
+                .filter(|r| r.is_promising(cli.min_sharpe * 0.7, cli.min_trades / 2))
+                .collect();
+
+            if !oos_promising.is_empty() {
+                info!(
+                    "✅ OUT-OF-SAMPLE VALIDATED on {} instruments!",
+                    oos_promising.len()
+                );
+                save_validated_strategy(
+                    &cli.output_dir,
+                    iteration,
+                    &strategy,
+                    &record.results,
+                    &oos_results,
+                )?;
+            } else {
+                info!("❌ out-of-sample did not confirm edge (likely overfit)");
+            }
+        }
+
+        // Track best strategy by average Sharpe across instruments
+        let avg_sharpe = record.avg_sharpe();
+        if avg_sharpe
+            > best_strategy
+                .as_ref()
+                .map(|(s, _)| *s)
+                .unwrap_or(f64::NEG_INFINITY)
+        {
+            best_strategy = Some((avg_sharpe, strategy.clone()));
+            info!("new best avg_sharpe: {avg_sharpe:.3}");
+        }
+
+        history.push(record);
+
+        // Trim conversation to avoid context window exhaustion.
+        // Keep system + last 6 messages (3 exchanges).
+        if conversation.len() > 10 {
+            // Summarize old history in the next prompt via results_text instead
+            conversation.drain(..conversation.len() - 6);
+        }
+    }
+
+    // Final summary
+    info!("━━━ search complete: {} iterations ━━━", history.len());
+    if let Some((sharpe, ref strat)) = best_strategy {
+        info!("best avg_sharpe: {sharpe:.3}");
+        let path = cli.output_dir.join("best_strategy.json");
+        std::fs::write(&path, serde_json::to_string_pretty(strat)?)?;
+        info!("saved to {}", path.display());
+    } else {
+        info!("no strategies showed positive Sharpe across instruments");
+    }
+
+    Ok(())
+}
+
+async fn run_single_backtest(
+    swym: &SwymClient,
+    inst: &Instrument,
+    strategy: &Value,
+    starts_at: &str,
+    finishes_at: &str,
+    initial_balance: &str,
+    fees_percent: &str,
+    poll_interval_secs: u64,
+    timeout_secs: u64,
+) -> Result<BacktestResult> {
+    let resp = swym
+        .submit_backtest(
+            &inst.exchange,
+            &inst.symbol,
+            &inst.base(),
+            &inst.quote(),
+            strategy,
+            starts_at,
+            finishes_at,
+            initial_balance,
+            fees_percent,
+        )
+        .await
+        .context("submit")?;
+
+    let run_id = resp.id;
+
+    let final_resp = swym
+        .poll_until_done(
+            run_id,
+            Duration::from_secs(poll_interval_secs),
+            Duration::from_secs(timeout_secs),
+        )
+        .await
+        .context("poll")?;
+
+    Ok(BacktestResult::from_response(&final_resp, &inst.symbol))
+}
+
+fn save_validated_strategy(
+    output_dir: &Path,
+    iteration: u32,
+    strategy: &Value,
+    in_sample: &[BacktestResult],
+    out_of_sample: &[BacktestResult],
+) -> Result<()> {
+    let report = serde_json::json!({
+        "iteration": iteration,
+        "strategy": strategy,
+        "in_sample": in_sample.iter().map(|r| serde_json::json!({
+            "instrument": r.instrument,
+            "sharpe": r.sharpe_ratio,
+            "net_pnl": r.net_pnl,
+            "profit_factor": r.profit_factor,
+            "win_rate": r.win_rate,
+            "total_trades": r.total_positions,
+        })).collect::<Vec<_>>(),
+        "out_of_sample": out_of_sample.iter().map(|r| serde_json::json!({
+            "instrument": r.instrument,
+            "sharpe": r.sharpe_ratio,
+            "net_pnl": r.net_pnl,
+            "profit_factor": r.profit_factor,
+            "win_rate": r.win_rate,
+            "total_trades": r.total_positions,
+        })).collect::<Vec<_>>(),
+    });
+
+    let path = output_dir.join(format!("validated_{iteration:03}.json"));
+    std::fs::write(&path, serde_json::to_string_pretty(&report)?)?;
+    info!("saved validated strategy to {}", path.display());
+    Ok(())
+}
diff --git a/src/claude.rs b/src/claude.rs
new file mode 100644
index 0000000..eb37414
--- /dev/null
+++ b/src/claude.rs
@@ -0,0 +1,136 @@
+use anyhow::{Context, Result};
+use reqwest::Client;
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+
+pub struct ClaudeClient {
+    client: Client,
+    api_key: String,
+    model: String,
+}
+
+#[derive(Serialize)]
+struct MessagesRequest {
+    model: String,
+    max_tokens: u32,
+    system: String,
+    messages: Vec<Message>,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct Message {
+    pub role: String,
+    pub content: String,
+}
+
+#[derive(Deserialize)]
+struct MessagesResponse {
+    content: Vec<ContentBlock>,
+    usage: Option<Usage>,
+}
+
+#[derive(Deserialize)]
+struct ContentBlock {
+    text: Option<String>,
+}
+
+#[derive(Deserialize, Debug)]
+pub struct Usage {
+    pub input_tokens: Option<u64>,
+    pub output_tokens: Option<u64>,
+}
+
+impl ClaudeClient {
+    pub fn new(api_key: &str, model: &str) -> Self {
+        let client = Client::builder()
+            .timeout(std::time::Duration::from_secs(120))
+            .build()
+            .expect("build http client");
+        Self {
+            client,
+            api_key: api_key.to_string(),
+            model: model.to_string(),
+        }
+    }
+
+    /// Send a conversation to Claude and get the text response.
+    pub async fn chat(
+        &self,
+        system: &str,
+        messages: &[Message],
+    ) -> Result<(String, Option<Usage>)> {
+        let body = MessagesRequest {
+            model: self.model.clone(),
+            max_tokens: 4096,
+            system: system.to_string(),
+            messages: messages.to_vec(),
+        };
+
+        let resp = self
+            .client
+            .post("https://api.anthropic.com/v1/messages")
+            .header("x-api-key", &self.api_key)
+            .header("anthropic-version", "2023-06-01")
+            .header("content-type", "application/json")
+            .json(&body)
+            .send()
+            .await
+            .context("claude API request")?;
+
+        if !resp.status().is_success() {
+            let status = resp.status();
+            let body = resp.text().await.unwrap_or_default();
+            anyhow::bail!("Claude API {status}: {body}");
+        }
+
+        let parsed: MessagesResponse = resp.json().await.context("parse claude response")?;
+        let text = parsed
+            .content
+            .into_iter()
+            .filter_map(|b| b.text)
+            .collect::<Vec<_>>()
+            .join("\n");
+
+        Ok((text, parsed.usage))
+    }
+}
+
+/// Extract a JSON object from Claude's response text.
+/// Looks for the first `{` ... `}` block, handling markdown code fences.
+pub fn extract_json(text: &str) -> Result<Value> {
+    // Strip markdown fences if present
+    let cleaned = text
+        .replace("```json", "")
+        .replace("```", "");
+
+    // Find the outermost JSON object
+    let mut depth = 0i32;
+    let mut start = None;
+    let mut end = None;
+
+    for (i, ch) in cleaned.char_indices() {
+        match ch {
+            '{' => {
+                if depth == 0 {
+                    start = Some(i);
+                }
+                depth += 1;
+            }
+            '}' => {
+                depth -= 1;
+                if depth == 0 {
+                    end = Some(i + 1);
+                    break;
+                }
+            }
+            _ => {}
+        }
+    }
+
+    let (s, e) = match (start, end) {
+        (Some(s), Some(e)) => (s, e),
+        _ => anyhow::bail!("no JSON object found in Claude response"),
+    };
+
+    serde_json::from_str(&cleaned[s..e]).context("parse extracted JSON")
+}
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..d14c854
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,122 @@
+use std::path::PathBuf;
+
+use clap::Parser;
+
+/// Autonomous strategy search agent for the swym backtesting platform.
+///
+/// Runs a loop: ask Claude to generate/refine strategies → submit backtests to swym →
+/// evaluate results → feed learnings back to Claude → repeat.
+#[derive(Parser, Debug)]
+#[command(name = "scout", version)]
+pub struct Cli {
+    /// Swym API base URL (no trailing slash).
+    #[arg(long, default_value = "https://dev.swym.hanzalova.internal/api/v1")]
+    pub swym_url: String,
+
+    /// Anthropic API key.
+    #[arg(long)]
+    pub anthropic_key: String,
+
+    /// Claude model to use for strategy generation.
+    #[arg(long, default_value = "claude-sonnet-4-20250514")]
+    pub model: String,
+
+    /// Maximum agent iterations (generate → backtest → evaluate cycles).
+    #[arg(long, default_value_t = 50)]
+    pub max_iterations: u32,
+
+    /// Minimum Sharpe ratio to consider a strategy "interesting".
+    #[arg(long, default_value_t = 1.0)]
+    pub min_sharpe: f64,
+
+    /// Minimum number of trades for a result to be meaningful.
+    #[arg(long, default_value_t = 10)]
+    pub min_trades: u32,
+
+    /// Instruments to test against, as "EXCHANGE:SYMBOL" (e.g. "binance_spot:BTCUSDC").
+    /// Strategies are tested against all listed instruments.
+    #[arg(long, value_delimiter = ',', default_values_t = vec![
+        "binance_spot:BTCUSDC".to_string(),
+        "binance_spot:ETHUSDC".to_string(),
+        "binance_spot:SOLUSDC".to_string(),
+    ])]
+    pub instruments: Vec<String>,
+
+    /// Backtest start date (ISO-8601).
+    #[arg(long, default_value = "2025-01-01T00:00:00Z")]
+    pub backtest_from: String,
+
+    /// Backtest end date (ISO-8601).
+    #[arg(long, default_value = "2025-10-01T00:00:00Z")]
+    pub backtest_to: String,
+
+    /// Out-of-sample start (for validation of promising strategies).
+    #[arg(long, default_value = "2025-10-01T00:00:00Z")]
+    pub oos_from: String,
+
+    /// Out-of-sample end.
+    #[arg(long, default_value = "2026-03-01T00:00:00Z")]
+    pub oos_to: String,
+
+    /// Initial quote balance for backtests.
+    #[arg(long, default_value = "10000")]
+    pub initial_balance: String,
+
+    /// Trading fee as decimal (0.001 = 0.1%).
+    #[arg(long, default_value = "0.001")]
+    pub fees_percent: String,
+
+    /// Directory to persist promising strategies and results.
+    #[arg(long, default_value = "./results")]
+    pub output_dir: PathBuf,
+
+    /// Poll interval in seconds when waiting for backtest completion.
+    #[arg(long, default_value_t = 2)]
+    pub poll_interval_secs: u64,
+
+    /// Maximum seconds to wait for a single backtest to complete.
+    #[arg(long, default_value_t = 300)]
+    pub backtest_timeout_secs: u64,
+}
+
+/// Parsed instrument reference.
+#[derive(Debug, Clone)]
+pub struct Instrument {
+    pub exchange: String,
+    pub symbol: String,
+}
+
+impl Instrument {
+    pub fn parse(s: &str) -> anyhow::Result<Self> {
+        let (exchange, symbol) = s
+            .split_once(':')
+            .ok_or_else(|| anyhow::anyhow!("instrument must be 'exchange:SYMBOL', got '{s}'"))?;
+        Ok(Self {
+            exchange: exchange.to_string(),
+            symbol: symbol.to_string(),
+        })
+    }
+
+    /// Base asset, lowercase, derived from symbol convention (e.g. BTCUSDC → btc).
+    pub fn base(&self) -> String {
+        // Strip known quote suffixes
+        let s = &self.symbol;
+        for quote in ["USDC", "USDT", "BUSD"] {
+            if let Some(base) = s.strip_suffix(quote) {
+                return base.to_lowercase();
+            }
+        }
+        s.to_lowercase()
+    }
+
+    /// Quote asset, lowercase.
+    pub fn quote(&self) -> String {
+        let s = &self.symbol;
+        for quote in ["USDC", "USDT", "BUSD"] {
+            if s.ends_with(quote) {
+                return quote.to_lowercase();
+            }
+        }
+        "usdc".to_string()
+    }
+}
diff --git a/src/dsl-schema.json b/src/dsl-schema.json
new file mode 100644
index 0000000..150d379
--- /dev/null
+++ b/src/dsl-schema.json
@@ -0,0 +1,422 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "$id": "https://swym.internal/strategy/schema.json",
+  "title": "SwymRuleBasedStrategy",
+  "description": "Swym rules-based strategy DSL. Submit as the 'strategy' field of a paper run config. All decimal values must be JSON strings.",
+  "type": "object",
+  "required": ["type", "candle_interval", "rules"],
+  "additionalProperties": false,
+  "properties": {
+    "type": {
+      "const": "rule_based"
+    },
+    "candle_interval": {
+      "type": "string",
+      "enum": ["1m", "5m", "15m", "1h", "4h", "1d"],
+      "description": "Primary candle interval driving strategy evaluation cadence."
+    },
+    "rules": {
+      "type": "array",
+      "items": { "$ref": "#/definitions/Rule" },
+      "minItems": 1,
+      "description": "All rules whose 'when' is true on a primary candle close fire simultaneously."
+    }
+  },
+  "definitions": {
+    "DecimalString": {
+      "description": "A decimal number encoded as a JSON string, e.g. \"3.14\", \"-0.5\", \"0.001\".",
+      "type": "string",
+      "pattern": "^-?[0-9]+(\\.[0-9]+)?$"
+    },
+    "CandleField": {
+      "type": "string",
+      "enum": ["open", "high", "low", "close", "volume"]
+    },
+    "TimeframeInterval": {
+      "type": "string",
+      "enum": ["1m", "5m", "15m", "1h", "4h", "1d"],
+      "description": "An additional candle interval to read from. When absent, uses the primary candle_interval. Requires backfilled candle data for the backtest window."
+    },
+    "FuncName": {
+      "type": "string",
+      "enum": ["highest", "lowest", "sma", "ema", "wma", "rsi", "std_dev", "sum", "atr", "supertrend", "adx", "bollinger_upper", "bollinger_lower"],
+      "description": "Rolling-window function. atr/adx/supertrend ignore 'field' and use OHLC internally. bollinger_upper/bollinger_lower use multiplier for num_std_dev (default 2.0)."
+    },
+    "ApplyFuncName": {
+      "type": "string",
+      "enum": ["highest", "lowest", "sma", "ema", "wma", "std_dev", "sum", "bollinger_upper", "bollinger_lower"],
+      "description": "Subset of FuncName valid inside apply_func. atr, supertrend, adx, and rsi are excluded. bollinger_upper/bollinger_lower use fixed num_std_dev=2.0 in apply_func context."
+    },
+    "CmpOp": {
+      "type": "string",
+      "enum": [">", "<", ">=", "<=", "=="]
+    },
+    "ArithOp": {
+      "type": "string",
+      "enum": ["add", "sub", "mul", "div"]
+    },
+    "UnaryOpKind": {
+      "type": "string",
+      "enum": ["abs", "sqrt", "neg", "log"]
+    },
+    "Action": {
+      "type": "object",
+      "required": ["side", "quantity"],
+      "additionalProperties": false,
+      "properties": {
+        "side": { "type": "string", "enum": ["buy", "sell"] },
+        "quantity": {
+          "$ref": "#/definitions/DecimalString",
+          "description": "Per-order size in base asset units, e.g. \"0.001\" for BTC."
+        }
+      }
+    },
+    "Rule": {
+      "type": "object",
+      "required": ["when", "then"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": {
+          "type": "string",
+          "description": "Optional human-readable annotation. Included in the content hash so keep stable."
+        },
+        "when": { "$ref": "#/definitions/Condition" },
+        "then": { "$ref": "#/definitions/Action" }
+      }
+    },
+    "Condition": {
+      "description": "A boolean condition evaluated at candle close. Returns false (safe no-op) when there is insufficient history.",
+      "oneOf": [
+        { "$ref": "#/definitions/ConditionAllOf" },
+        { "$ref": "#/definitions/ConditionAnyOf" },
+        { "$ref": "#/definitions/ConditionNot" },
+        { "$ref": "#/definitions/ConditionPosition" },
+        { "$ref": "#/definitions/ConditionEmaCrossover" },
+        { "$ref": "#/definitions/ConditionEmaTrend" },
+        { "$ref": "#/definitions/ConditionRsi" },
+        { "$ref": "#/definitions/ConditionBollinger" },
+        { "$ref": "#/definitions/ConditionPriceLevel" },
+        { "$ref": "#/definitions/ConditionCompare" },
+        { "$ref": "#/definitions/ConditionCrossOver" },
+        { "$ref": "#/definitions/ConditionCrossUnder" },
+        { "$ref": "#/definitions/ConditionEventCount" }
+      ]
+    },
+    "ConditionComment": {
+      "description": "Optional human-readable annotation on any condition node. Ignored by the evaluator; serde drops unknown fields silently.",
+      "type": "string"
+    },
+    "ConditionAllOf": {
+      "type": "object",
+      "required": ["kind", "conditions"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "all_of" },
+        "conditions": {
+          "type": "array",
+          "items": { "$ref": "#/definitions/Condition" },
+          "minItems": 1
+        }
+      }
+    },
+    "ConditionAnyOf": {
+      "type": "object",
+      "required": ["kind", "conditions"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "any_of" },
+        "conditions": {
+          "type": "array",
+          "items": { "$ref": "#/definitions/Condition" },
+          "minItems": 1
+        }
+      }
+    },
+    "ConditionNot": {
+      "type": "object",
+      "required": ["kind", "condition"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "not" },
+        "condition": { "$ref": "#/definitions/Condition" }
+      }
+    },
+    "ConditionPosition": {
+      "type": "object",
+      "required": ["kind", "state"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "position" },
+        "state": { "type": "string", "enum": ["flat", "long", "short"] }
+      }
+    },
+    "ConditionEmaCrossover": {
+      "description": "True on the bar where fast EMA crosses above (or below) slow EMA. Fires once per cross event.",
+      "type": "object",
+      "required": ["kind", "fast_period", "slow_period", "direction"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "ema_crossover" },
+        "fast_period": { "type": "integer", "minimum": 1 },
+        "slow_period": { "type": "integer", "minimum": 1 },
+        "direction": { "type": "string", "enum": ["above", "below"] },
+        "timeframe": { "$ref": "#/definitions/TimeframeInterval" }
+      }
+    },
+    "ConditionEmaTrend": {
+      "description": "True while close price is above (or below) the EMA. Persistent condition, not a crossover event.",
+      "type": "object",
+      "required": ["kind", "period", "direction"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "ema_trend" },
+        "period": { "type": "integer", "minimum": 1 },
+        "direction": { "type": "string", "enum": ["above", "below"] },
+        "timeframe": { "$ref": "#/definitions/TimeframeInterval" }
+      }
+    },
+    "ConditionRsi": {
+      "description": "True while RSI (Wilder's method) is above or below the threshold.",
+      "type": "object",
+      "required": ["kind", "threshold", "comparison"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "rsi" },
+        "period": {
+          "type": "integer",
+          "minimum": 1,
+          "default": 14,
+          "description": "RSI period. Defaults to 14."
+        },
+        "threshold": { "$ref": "#/definitions/DecimalString" },
+        "comparison": { "type": "string", "enum": ["above", "below"] },
+        "timeframe": { "$ref": "#/definitions/TimeframeInterval" }
+      }
+    },
+    "ConditionBollinger": {
+      "description": "True when close breaks above the upper or below the lower Bollinger Band.",
+      "type": "object",
+      "required": ["kind", "band"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "bollinger" },
+        "period": {
+          "type": "integer",
+          "minimum": 1,
+          "default": 20
+        },
+        "num_std_dev": {
+          "$ref": "#/definitions/DecimalString",
+          "description": "Number of standard deviations. Defaults to \"2\"."
+        },
+        "band": { "type": "string", "enum": ["above_upper", "below_lower"] },
+        "timeframe": { "$ref": "#/definitions/TimeframeInterval" }
+      }
+    },
+    "ConditionPriceLevel": {
+      "description": "True while close is above or below a fixed price level.",
+      "type": "object",
+      "required": ["kind", "price", "direction"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "price_level" },
+        "price": { "$ref": "#/definitions/DecimalString" },
+        "direction": { "type": "string", "enum": ["above", "below"] },
+        "timeframe": { "$ref": "#/definitions/TimeframeInterval" }
+      }
+    },
+    "ConditionCompare": {
+      "description": "True when left op right holds. Use for any indicator comparison not covered by the legacy shortcuts.",
+      "type": "object",
+      "required": ["kind", "left", "op", "right"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "compare" },
+        "left": { "$ref": "#/definitions/Expr" },
+        "op": { "$ref": "#/definitions/CmpOp" },
+        "right": { "$ref": "#/definitions/Expr" }
+      }
+    },
+    "ConditionCrossOver": {
+      "description": "True on the single bar where left crosses above right (left was <= right, now > right).",
+      "type": "object",
+      "required": ["kind", "left", "right"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "cross_over" },
+        "left": { "$ref": "#/definitions/Expr" },
+        "right": { "$ref": "#/definitions/Expr" }
+      }
+    },
+    "ConditionCrossUnder": {
+      "description": "True on the single bar where left crosses below right (left was >= right, now < right).",
+      "type": "object",
+      "required": ["kind", "left", "right"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "cross_under" },
+        "left": { "$ref": "#/definitions/Expr" },
+        "right": { "$ref": "#/definitions/Expr" }
+      }
+    },
+    "Expr": {
+      "description": "A numeric expression evaluating to Option<Decimal>. Returns None (condition → false) when history is insufficient.",
+      "oneOf": [
+        { "$ref": "#/definitions/ExprLiteral" },
+        { "$ref": "#/definitions/ExprField" },
+        { "$ref": "#/definitions/ExprFunc" },
+        { "$ref": "#/definitions/ExprBinOp" },
+        { "$ref": "#/definitions/ExprApplyFunc" },
+        { "$ref": "#/definitions/ExprUnaryOp" },
+        { "$ref": "#/definitions/ExprBarsSince" }
+      ]
+    },
+    "ExprLiteral": {
+      "description": "A constant numeric value.",
+      "type": "object",
+      "required": ["kind", "value"],
+      "additionalProperties": false,
+      "properties": {
+        "kind": { "const": "literal" },
+        "value": { "$ref": "#/definitions/DecimalString" }
+      }
+    },
+    "ExprField": {
+      "description": "An OHLCV candle field, optionally from N bars ago and/or from a different timeframe.",
+      "type": "object",
+      "required": ["kind", "field"],
+      "additionalProperties": false,
+      "properties": {
+        "kind": { "const": "field" },
+        "field": { "$ref": "#/definitions/CandleField" },
+        "offset": {
+          "type": "integer",
+          "minimum": 0,
+          "default": 0,
+          "description": "Bars ago. 0 = current bar, 1 = previous bar."
+        },
+        "timeframe": { "$ref": "#/definitions/TimeframeInterval" }
+      }
+    },
+    "ExprFunc": {
+      "description": "A rolling-window function applied to a candle field over the trailing N bars, optionally on a different timeframe.",
+      "type": "object",
+      "required": ["kind", "name", "period"],
+      "additionalProperties": false,
+      "properties": {
+        "kind": { "const": "func" },
+        "name": { "$ref": "#/definitions/FuncName" },
+        "field": {
+          "$ref": "#/definitions/CandleField",
+          "description": "Which candle field to use. Defaults to 'close'. Ignored for atr, adx, supertrend."
+        },
+        "period": {
+          "type": "integer",
+          "minimum": 1,
+          "description": "Window size in bars. Minimum bars required: period (most funcs), period+1 (atr/rsi), 2*period+1 (adx), period+2 (supertrend)."
+        },
+        "offset": {
+          "type": "integer",
+          "minimum": 0,
+          "default": 0,
+          "description": "Shift the window back N bars. 0 = window ending on current bar."
+        },
+        "multiplier": {
+          "$ref": "#/definitions/DecimalString",
+          "description": "Numeric multiplier: ATR multiplier for supertrend (e.g. \"3.0\"); num_std_dev for bollinger_upper/bollinger_lower (e.g. \"2.0\", default). Omit for all other functions."
+        },
+        "timeframe": { "$ref": "#/definitions/TimeframeInterval" }
+      }
+    },
+    "ExprBinOp": {
+      "description": "Arithmetic combination of two sub-expressions. Division by zero returns None.",
+      "type": "object",
+      "required": ["kind", "op", "left", "right"],
+      "additionalProperties": false,
+      "properties": {
+        "kind": { "const": "bin_op" },
+        "op": { "$ref": "#/definitions/ArithOp" },
+        "left": { "$ref": "#/definitions/Expr" },
+        "right": { "$ref": "#/definitions/Expr" }
+      }
+    },
+    "ExprApplyFunc": {
+      "description": "Applies a rolling function to an arbitrary sub-expression evaluated at each bar in the window. Use for function composition: EMA-of-EMA, Hull MA, VWAP, etc. NOT valid with atr, adx, supertrend, or rsi.",
+      "type": "object",
+      "required": ["kind", "name", "input", "period"],
+      "additionalProperties": false,
+      "properties": {
+        "kind": { "const": "apply_func" },
+        "name": { "$ref": "#/definitions/ApplyFuncName" },
+        "input": { "$ref": "#/definitions/Expr" },
+        "period": { "type": "integer", "minimum": 1 },
+        "offset": {
+          "type": "integer",
+          "minimum": 0,
+          "default": 0
+        },
+        "timeframe": { "$ref": "#/definitions/TimeframeInterval" }
+      }
+    },
+    "ExprUnaryOp": {
+      "description": "Unary math operation. sqrt and log return None for invalid inputs (negative / non-positive).",
+      "type": "object",
+      "required": ["kind", "op", "operand"],
+      "additionalProperties": false,
+      "properties": {
+        "kind": { "const": "unary_op" },
+        "op": { "$ref": "#/definitions/UnaryOpKind" },
+        "operand": { "$ref": "#/definitions/Expr" }
+      }
+    },
+    "ConditionEventCount": {
+      "description": "Counts how many of the trailing `period` bars (offsets 1..=period, excluding the current bar) the sub-condition was true, then applies op against count. Returns false during warm-up. Only Compare, CrossOver, CrossUnder, AllOf, AnyOf, Not, and nested EventCount sub-conditions are offset-aware; Position/EmaCrossover/EmaTrend/Rsi/Bollinger return false at non-zero offsets.",
+      "type": "object",
+      "required": ["kind", "condition", "period", "op", "count"],
+      "additionalProperties": false,
+      "properties": {
+        "comment": { "$ref": "#/definitions/ConditionComment" },
+        "kind": { "const": "event_count" },
+        "condition": { "$ref": "#/definitions/Condition" },
+        "period": {
+          "type": "integer",
+          "minimum": 1,
+          "description": "Number of trailing bars to scan (not including the current bar)."
+        },
+        "op": { "$ref": "#/definitions/CmpOp" },
+        "count": {
+          "type": "integer",
+          "minimum": 0,
+          "description": "Integer threshold to compare the fire count against."
+        }
+      }
+    },
+    "ExprBarsSince": {
+      "description": "Scans back up to `period` bars and returns how many bars ago the sub-condition was last true (1 = previous bar). Returns None if the condition never fired within the window. Use inside compare to express recency constraints.",
+      "type": "object",
+      "required": ["kind", "condition", "period"],
+      "additionalProperties": false,
+      "properties": {
+        "kind": { "const": "bars_since" },
+        "condition": { "$ref": "#/definitions/Condition" },
+        "period": {
+          "type": "integer",
+          "minimum": 1,
+          "description": "Maximum bars to look back."
+        }
+      }
+    }
+  }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..065c1f3
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,31 @@
+mod agent;
+mod claude;
+mod config;
+mod prompts;
+mod swym;
+
+use clap::Parser;
+use tracing_subscriber::EnvFilter;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info")),
+        )
+        .with_target(false)
+        .init();
+
+    let cli = config::Cli::parse();
+
+    tracing::info!("scout starting");
+    tracing::info!("  swym API:    {}", cli.swym_url);
+    tracing::info!("  model:       {}", cli.model);
+    tracing::info!("  iterations:  {}", cli.max_iterations);
+    tracing::info!("  instruments: {:?}", cli.instruments);
+    tracing::info!("  in-sample:   {} → {}", cli.backtest_from, cli.backtest_to);
+    tracing::info!("  OOS:         {} → {}", cli.oos_from, cli.oos_to);
+    tracing::info!("  output:      {}", cli.output_dir.display());
+
+    agent::run(&cli).await
+}
diff --git a/src/prompts.rs b/src/prompts.rs
new file mode 100644
index 0000000..f7446ac
--- /dev/null
+++ b/src/prompts.rs
@@ -0,0 +1,180 @@
+/// System prompt for the strategy-generation Claude instance.
+///
+/// This is the most important part of the agent — it defines how Claude
+/// thinks about strategy design, what it knows about the DSL, and how
+/// it should interpret backtest results.
+pub fn system_prompt(dsl_schema: &str) -> String {
+    format!(
+        r##"You are a quantitative trading strategy researcher. Your task is to design,
+evaluate, and iteratively refine trading strategies expressed in the swym JSON DSL.
+
+## Your goal
+
+Find strategies with genuine statistical edge — not curve-fitted artifacts. A good
+strategy has:
+- Sharpe ratio > 1.0 (ideally > 1.5)
+- Profit factor > 1.3
+- At least 15+ trades (more is better — sparse strategies are unverifiable)
+- Positive net PnL after fees
+- Consistent performance across multiple instruments (BTC, ETH, SOL vs USDC)
+
+## Strategy DSL
+
+Strategies are JSON objects. Here is the complete JSON Schema:
+
+```json
+{dsl_schema}
+```
+
+## Key DSL capabilities
+
+### Indicators (func)
+sma, ema, wma, rsi, std_dev, sum, highest, lowest, atr, supertrend, adx,
+bollinger_upper, bollinger_lower — applied to any candle field (open/high/low/close/volume)
+with configurable period and optional offset.
+
+### Composed indicators (apply_func)
+Apply rolling functions to arbitrary expressions: EMA of EMA, Hull MA (WMA of expression),
+VWAP (sum of close*volume / sum of volume), standard deviation of returns, etc.
+
+### Conditions
+compare (>, <, >=, <=, ==), cross_over, cross_under — for event detection.
+all_of, any_of, not — boolean combinators.
+event_count — count how many times a condition fired in last N bars.
+bars_since — how many bars since a condition was last true.
+
+### Position state (Phase 1 — newly available)
+entry_price — average entry price of current position
+position_quantity — size of current position
+unrealised_pnl — current unrealised P&L
+bars_since_entry — complete bars elapsed since position was opened
+balance — free balance of a named asset (e.g. "usdt", "usdc")
+
+### Dynamic quantity
+Action quantity can be a fixed string ("0.001") or an Expr for dynamic sizing.
+ATR-based sizing, percent-of-balance, etc.
+
+### Multi-timeframe
+Any expression can reference a different timeframe via "timeframe" field.
+Use higher timeframes as trend filters, lower timeframes for entry precision.
+
+## Strategy families to explore
+
+1. **Trend-following**: Moving average crossovers, breakouts above N-bar highs,
+   ADX filter for trend strength. Risk: whipsaws in ranging markets.
+
+2. **Mean reversion**: RSI oversold/overbought, Bollinger band touches, deviation
+   from moving average. Risk: trending markets run against you.
+
+3. **Momentum**: Rate of change, volume confirmation, relative strength.
+   Risk: momentum exhaustion, late entry.
+
+4. **Volatility breakout**: ATR-based bands, Bollinger squeeze → expansion,
+   Supertrend flips. Risk: false breakouts.
+
+5. **Multi-timeframe filtered**: Higher TF trend filter + lower TF entry signal.
+   E.g. daily EMA trend + 4h RSI entry. Generally more robust than single-TF.
+
+6. **Composite / hybrid**: Combine families. Trend filter + mean-reversion entry.
+   Momentum confirmation + volatility sizing.
+
+## Risk management (always include)
+
+Every strategy MUST have:
+- A stop-loss: use entry_price with a percentage or ATR-based offset
+- A time-based exit: use bars_since_entry to avoid holding losers indefinitely
+- Reasonable position sizing: prefer ATR-based or percent-of-balance over fixed quantity
+
+## How to respond
+
+You must respond with ONLY a valid JSON object — the strategy config.
+No prose, no markdown explanation, no commentary.
+Just the raw JSON starting with {{ and ending with }}.
+
+The JSON must be a valid strategy with "type": "rule_based".
+Use "usdc" (not "usdt") as the quote asset for balance expressions.
+
+## Interpreting backtest results
+
+When I share results from previous iterations, use them to guide your next strategy:
+
+- **Zero trades**: The entry conditions are too restrictive or never co-occur.
+  Relax thresholds, simplify conditions, or check if the indicator periods make
+  sense for the candle interval.
+
+- **Many trades but negative PnL**: The entry signal has no edge, or the exit
+  logic is poor. Try different indicator combinations, add trend filters, or
+  improve stop-loss placement.
+
+- **Few trades, slightly positive**: Promising direction but not statistically
+  significant. Try to make the signal fire more often (lower thresholds, shorter
+  periods) while preserving the edge.
+
+- **Good Sharpe but low profit factor**: Wins are small relative to losses.
+  Tighten stop-losses or add a profit target.
+
+- **Good profit factor but negative Sharpe**: High variance. Add position sizing
+  or volatility filters to reduce exposure during chaotic periods.
+
+- **Condition audit shows one condition always true/false**: That condition is
+  redundant or broken. Remove it or adjust its parameters.
+
+## Anti-patterns to avoid
+
+- Don't use the same indicator for both entry and exit (circular logic)
+- Don't set RSI thresholds at extreme values (< 10 or > 90) — too rare to fire
+- Don't use very short periods (< 5) on high timeframes — noisy
+- Don't use very long periods (> 100) on low timeframes — too slow to react
+- Don't create strategies with more than 5-6 conditions — overfitting risk
+- Don't ignore fees — a strategy needs to overcome 0.1% per round trip
+- Always gate buy rules with position state "flat" and sell rules with "long"
+"##
+    )
+}
+
+/// Build the user message for the first iteration (no prior results).
+pub fn initial_prompt(instruments: &[String], candle_intervals: &[String]) -> String {
+    format!(
+        r#"Design a trading strategy for crypto spot markets.
+
+Available instruments: {}
+Available candle intervals: {}
+
+Start with a multi-timeframe trend-following approach with proper risk management
+(stop-loss, time exit, and ATR-based position sizing). Use "usdc" as the quote asset.
+
+Respond with ONLY the strategy JSON."#,
+        instruments.join(", "),
+        candle_intervals.join(", "),
+    )
+}
+
+/// Build the user message for subsequent iterations, including prior results.
+pub fn iteration_prompt(
+    iteration: u32,
+    results_history: &str,
+    best_so_far: Option<&str>,
+) -> String {
+    let best_section = match best_so_far {
+        Some(strat) => format!(
+            "\n\nBest strategy so far:\n```json\n{strat}\n```\n\n\
+             You may refine this strategy or try something completely different."
+        ),
+        None => String::from(
+            "\n\nNo promising strategies found yet. Try a different approach — \
+             different indicator family, different timeframe, different entry logic."
+        ),
+    };
+
+    format!(
+        r#"Iteration {iteration}. Here are the results from all previous backtests:
+
+{results_history}
+{best_section}
+
+Based on these results, design the next strategy to test. Learn from what worked
+and what didn't. If a strategy family consistently fails, try a different one.
+
+Respond with ONLY the strategy JSON."#,
+    )
+}
diff --git a/src/swym.rs b/src/swym.rs
new file mode 100644
index 0000000..a639c8a
--- /dev/null
+++ b/src/swym.rs
@@ -0,0 +1,249 @@
+use anyhow::{Context, Result};
+use reqwest::Client;
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use uuid::Uuid;
+
+/// Client for the swym backtesting API.
+pub struct SwymClient {
+    client: Client,
+    base_url: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct PaperRunResponse {
+    pub id: Uuid,
+    pub status: String,
+    pub result_summary: Option<Value>,
+    pub error_message: Option<String>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct PositionsResponse {
+    pub total: u32,
+    pub positions: Vec<Value>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct CandleCoverage {
+    pub interval: String,
+    pub first_open: String,
+    pub last_close: String,
+    pub count: u64,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct BacktestResult {
+    pub run_id: Uuid,
+    pub instrument: String,
+    pub status: String,
+    pub total_positions: Option<u32>,
+    pub winning_positions: Option<u32>,
+    pub losing_positions: Option<u32>,
+    pub win_rate: Option<f64>,
+    pub profit_factor: Option<f64>,
+    pub total_pnl: Option<f64>,
+    pub net_pnl: Option<f64>,
+    pub sharpe_ratio: Option<f64>,
+    pub total_fees: Option<f64>,
+    pub avg_bars_in_trade: Option<f64>,
+    pub error_message: Option<String>,
+    pub condition_audit_summary: Option<Value>,
+}
+
+impl BacktestResult {
+    pub fn from_response(resp: &PaperRunResponse, instrument: &str) -> Self {
+        let summary = resp.result_summary.as_ref();
+        Self {
+            run_id: resp.id,
+            instrument: instrument.to_string(),
+            status: resp.status.clone(),
+            total_positions: summary.and_then(|s| s["total_positions"].as_u64().map(|v| v as u32)),
+            winning_positions: summary.and_then(|s| s["winning_positions"].as_u64().map(|v| v as u32)),
+            losing_positions: summary.and_then(|s| s["losing_positions"].as_u64().map(|v| v as u32)),
+            win_rate: summary.and_then(|s| s["win_rate"].as_f64()),
+            profit_factor: summary.and_then(|s| s["profit_factor"].as_f64()),
+            total_pnl: summary.and_then(|s| s["total_pnl"].as_f64()),
+            net_pnl: summary.and_then(|s| s["net_pnl"].as_f64()),
+            sharpe_ratio: summary.and_then(|s| s["sharpe_ratio"].as_f64()),
+            total_fees: summary.and_then(|s| s["total_fees"].as_f64()),
+            avg_bars_in_trade: summary.and_then(|s| s["avg_bars_in_trade"].as_f64()),
+            error_message: resp.error_message.clone(),
+            condition_audit_summary: summary.and_then(|s| s.get("condition_audit_summary").cloned()),
+        }
+    }
+
+    /// One-line summary for logging and feeding back to Claude.
+    pub fn summary_line(&self) -> String {
+        if self.status == "failed" {
+            return format!(
+                "[{}] FAILED: {}",
+                self.instrument,
+                self.error_message.as_deref().unwrap_or("unknown error")
+            );
+        }
+        format!(
+            "[{}] trades={} win_rate={:.1}% pf={:.2} net_pnl={:.2} sharpe={:.2} avg_bars={:.1}",
+            self.instrument,
+            self.total_positions.unwrap_or(0),
+            self.win_rate.unwrap_or(0.0) * 100.0,
+            self.profit_factor.unwrap_or(0.0),
+            self.net_pnl.unwrap_or(0.0),
+            self.sharpe_ratio.unwrap_or(0.0),
+            self.avg_bars_in_trade.unwrap_or(0.0),
+        )
+    }
+
+    /// Is this result promising enough to warrant out-of-sample validation?
+    pub fn is_promising(&self, min_sharpe: f64, min_trades: u32) -> bool {
+        self.status == "complete"
+            && self.sharpe_ratio.unwrap_or(0.0) > min_sharpe
+            && self.total_positions.unwrap_or(0) >= min_trades
+            && self.net_pnl.unwrap_or(0.0) > 0.0
+    }
+}
+
+impl SwymClient {
+    pub fn new(base_url: &str) -> Result<Self> {
+        let client = Client::builder()
+            .danger_accept_invalid_certs(true) // internal TLS with self-signed certs
+            .timeout(std::time::Duration::from_secs(30))
+            .build()?;
+        Ok(Self {
+            client,
+            base_url: base_url.trim_end_matches('/').to_string(),
+        })
+    }
+
+    /// Check candle coverage for an instrument.
+    pub async fn candle_coverage(
+        &self,
+        exchange: &str,
+        symbol: &str,
+    ) -> Result<Vec<CandleCoverage>> {
+        let url = format!(
+            "{}/market-candles/coverage/{}/{}",
+            self.base_url, exchange, symbol
+        );
+        let resp = self
+            .client
+            .get(&url)
+            .send()
+            .await
+            .context("candle coverage request")?;
+        if !resp.status().is_success() {
+            let status = resp.status();
+            let body = resp.text().await.unwrap_or_default();
+            anyhow::bail!("candle coverage {status}: {body}");
+        }
+        resp.json().await.context("parse candle coverage")
+    }
+
+    /// Submit a backtest run.
+    pub async fn submit_backtest(
+        &self,
+        instrument_exchange: &str,
+        instrument_symbol: &str,
+        base_asset: &str,
+        quote_asset: &str,
+        strategy: &Value,
+        starts_at: &str,
+        finishes_at: &str,
+        initial_balance: &str,
+        fees_percent: &str,
+    ) -> Result<PaperRunResponse> {
+        let body = serde_json::json!({
+            "mode": "backtest",
+            "starts_at": starts_at,
+            "finishes_at": finishes_at,
+            "risk_free_return": "0.05",
+            "config": {
+                "instrument": {
+                    "exchange": instrument_exchange,
+                    "name_exchange": instrument_symbol,
+                    "underlying": { "base": base_asset, "quote": quote_asset },
+                    "quote": "underlying_quote",
+                    "kind": "spot"
+                },
+                "execution": {
+                    "mocked_exchange": instrument_exchange,
+                    "latency_ms": 100,
+                    "fees_percent": fees_percent,
+                    "initial_state": {
+                        "exchange": instrument_exchange,
+                        "balances": [{
+                            "asset": quote_asset,
+                            "balance": { "total": initial_balance, "free": initial_balance },
+                            "time_exchange": starts_at
+                        }],
+                        "instrument": {
+                            "instrument_name": instrument_symbol,
+                            "orders": []
+                        }
+                    }
+                },
+                "strategy": strategy,
+                "audit_conditions": true
+            }
+        });
+
+        let url = format!("{}/paper-runs", self.base_url);
+        let resp = self
+            .client
+            .post(&url)
+            .json(&body)
+            .send()
+            .await
+            .context("submit backtest")?;
+
+        if !resp.status().is_success() {
+            let status = resp.status();
+            let body_text = resp.text().await.unwrap_or_default();
+            anyhow::bail!("submit backtest {status}: {body_text}");
+        }
+        resp.json().await.context("parse backtest response")
+    }
+
+    /// Poll a run until it reaches a terminal state.
+    pub async fn poll_until_done(
+        &self,
+        run_id: Uuid,
+        poll_interval: std::time::Duration,
+        timeout: std::time::Duration,
+    ) -> Result<PaperRunResponse> {
+        let url = format!("{}/paper-runs/{}", self.base_url, run_id);
+        let deadline = tokio::time::Instant::now() + timeout;
+
+        loop {
+            let resp: PaperRunResponse = self
+                .client
+                .get(&url)
+                .send()
+                .await
+                .context("poll backtest")?
+                .json()
+                .await
+                .context("parse poll response")?;
+
+            match resp.status.as_str() {
+                "complete" | "failed" | "cancelled" => return Ok(resp),
+                _ => {
+                    if tokio::time::Instant::now() > deadline {
+                        anyhow::bail!("backtest {run_id} timed out after {}s", timeout.as_secs());
+                    }
+                    tokio::time::sleep(poll_interval).await;
+                }
+            }
+        }
+    }
+
+    /// Fetch condition audit summary for a completed run.
+    pub async fn condition_audit(&self, run_id: Uuid) -> Result<Value> {
+        let url = format!("{}/paper-runs/{}/condition-audit", self.base_url, run_id);
+        let resp = self.client.get(&url).send().await?;
+        if !resp.status().is_success() {
+            anyhow::bail!("condition audit {}: {}", resp.status(), resp.text().await?);
+        }
+        resp.json().await.context("parse condition audit")
+    }
+}