diff --git a/codex-rs/execpolicy2/README.md b/codex-rs/execpolicy2/README.md
index ac2535e75f..e433f5e2cc 100644
--- a/codex-rs/execpolicy2/README.md
+++ b/codex-rs/execpolicy2/README.md
@@ -24,10 +24,10 @@ prefix_rule(
 {
   "match": {
     "decision": "allow|prompt|forbidden",
-    "matched_rules": [
+    "matchedRules": [
       {
         "prefixRuleMatch": {
-          "matched_prefix": ["<token>", "..."],
+          "matchedPrefix": ["<token>", "..."],
           "decision": "allow|prompt|forbidden"
         }
       }
@@ -41,7 +41,7 @@ prefix_rule(
 "noMatch"
 ```
 
-- `matched_rules` lists every rule whose prefix matched the command; `matched_prefix` is the exact prefix that matched.
+- `matchedRules` lists every rule whose prefix matched the command; `matchedPrefix` is the exact prefix that matched.
 - The effective `decision` is the strictest severity across all matches (`forbidden` > `prompt` > `allow`).
 
 ## CLI
diff --git a/codex-rs/execpolicy2/src/policy.rs b/codex-rs/execpolicy2/src/policy.rs
index 8b17d5add4..d453404b26 100644
--- a/codex-rs/execpolicy2/src/policy.rs
+++ b/codex-rs/execpolicy2/src/policy.rs
@@ -46,6 +46,7 @@ pub enum Evaluation {
     NoMatch,
     Match {
         decision: Decision,
+        #[serde(rename = "matchedRules")]
         matched_rules: Vec<RuleMatch>,
     },
 }
diff --git a/codex-rs/execpolicy2/src/rule.rs b/codex-rs/execpolicy2/src/rule.rs
index 191529dea3..20e23fe6a2 100644
--- a/codex-rs/execpolicy2/src/rule.rs
+++ b/codex-rs/execpolicy2/src/rule.rs
@@ -60,6 +60,7 @@ impl PrefixPattern {
 #[serde(rename_all = "camelCase")]
 pub enum RuleMatch {
     PrefixRuleMatch {
+        #[serde(rename = "matchedPrefix")]
         matched_prefix: Vec<String>,
         decision: Decision,
     },