## What changed
Return consistent `Unable to perform operation:` messages for provider,
authentication, request construction, transport, and response parsing failures.
Do not include the underlying error details in these user-facing messages.
GitOrigin-RevId: c23fe7713f9d61e5f013ef217e1c0bdc2b824d83
## What changed
- Serialize each history and notes request's output truncation policy into the
`x-openai-tool-output-truncation-policy` header.
- Forward the invoking tool call's policy for tool requests and use the thread
hint byte limit for context-contributor requests.
GitOrigin-RevId: 9d4e61480397b325efdb033861893e88c708de3b
## What changed
- Mark history and notes search queries, appended note text, and replacement note text as encrypted in their tool schemas.
- Send `x-openai-encrypted-tool-arguments: true` for the corresponding backend routes without changing the JSON request body.
## Testing
- Cover encrypted schema fields and backend headers for history search, notes search, append, and write calls.
- Verify unrelated history and notes requests do not receive the encrypted-arguments header.
GitOrigin-RevId: 58263cff832c979b436ddb4013b5c27218aca678
## Why
Token-budget sessions need a way to recover prior conversation context and preserve working state across context-window transitions.
## What changed
- Add direct-model `history` tools for listing windows and items, reading items, and searching conversation contents.
- Add direct-model `notes` tools for listing, reading, searching, appending, and writing persistent notes.
- Route tool calls through the configured Codex backend with trusted session and agent context, bounded request arguments, and truncation-aware output handling.
- Expose the extension when `features.token_budget.use_history_notes_history` is enabled with an OpenAI provider and Codex backend authentication.
## Testing
- Cover tool registration, configuration changes, provider and authentication requirements, backend request context, encrypted output preservation, and request and response limits.
GitOrigin-RevId: 43b259f01014ba3f30803dd7cd5634942407a9bb
pmccrary-oai