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Changelog

All notable changes to anthropic-rs are documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Added

  • Optional tracing Cargo feature. When enabled, every HTTP call on the transport critical path emits an anthropic.http span with method, path, status, attempts, and duration_ms fields, plus a per-attempt debug! event carrying the attempt number, response status, and attempt duration. The dependency and every instrumentation point compile out entirely when the feature is off.
  • Per-call retry policy override via the new RetryPolicy type and the MessagesRequestBuilder::backoff / no_retries / retry_policy builder methods (plus the equivalents on CountTokensRequestBuilder and CreateBatchRequest). Interactive paths can opt out of retries with .no_retries(); background workers can stretch the retry budget with .backoff(ExponentialBackoff { .. }) — all without rebuilding the Client.
  • Pinned MSRV of 1.82 via package.rust-version in anthropic/Cargo.toml and a matching MSRV job in .github/workflows/ci.yml that reads the version from Cargo.toml so it stays in sync automatically.
  • Supply-chain CI: a new .github/workflows/supply-chain.yml runs cargo audit and cargo deny (checking advisories, bans, licenses, and sources) on every PR, every push to main, and on a daily schedule. Policy is configured in a committed deny.toml.
  • Fuzz targets for parse_error and parse_results_jsonl under fuzz/, wired to a Fuzz GitHub Actions workflow that smoke-runs each target on nightly. Both parsers sit on the transport critical path and consume attacker-controllable bytes, so the harness enforces the "never panic on arbitrary input" contract. A small regression corpus is baked into the library's __fuzz test module so the same invariants are checked in regular CI runs.
  • Client now derives Clone and implements Debug with the API key redacted, so clients can be safely shared across handlers and printed in diagnostic logs without leaking credentials.
  • MessagesRequestBuilder validates temperature and top_p against [0.0, 1.0] locally before sending the request.
  • ClientBuilder rejects empty api_key, api_base, and api_version values up front (previously they would surface as opaque API errors).
  • Client::from_env returns AnthropicError::InvalidRequest if ANTHROPIC_TIMEOUT_SECS cannot be parsed as a positive integer (previously the value was silently ignored).
  • 429 retries now honor the Retry-After response header (integer seconds form).
  • CLAUDE.md agent context file documenting workspace layout, conventions, build commands, and gotchas.
  • CHANGELOG.md (this file).

Changed

  • Streaming transport errors are now surfaced as AnthropicError::EventSource instead of being string-wrapped into AnthropicError::InvalidRequest. Callers can now match on the typed variant.
  • Client::messages / messages_stream / count_tokens / etc. share a single execute_bytes helper, removing the duplicated retry loop that previously lived in execute and execute_raw.
  • README clarifies that run_tool_loop executes tool callbacks sequentially (the previous wording incorrectly claimed parallel execution).
  • .env.example rewritten to match the variables actually read by Client::from_env (ANTHROPIC_API_KEY, ANTHROPIC_API_BASE, ANTHROPIC_API_VERSION, ANTHROPIC_BETA, ANTHROPIC_TIMEOUT_SECS).
  • Crate homepage / repository URLs in Cargo.toml updated to the current AbdelStark/anthropic-rs repository.

Removed

  • anthropic::stream::empty_response — unused outside its own test and trivially constructible by users who actually need an empty MessagesResponse.

[0.1.0]

Initial release of the modernized SDK. See git history for details.