release: v0.16.6 — Gemini thought_signature crash fix#8
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johnnichev merged 3 commits intomainfrom Mar 16, 2026
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Gemini 3.x returns thought_signature as opaque binary (protobuf/hash),
not UTF-8 text. The previous .decode("utf-8") crashed with
UnicodeDecodeError on non-UTF-8 bytes (e.g. 0xa4, 0xd5).
Replaced UTF-8 encode/decode with base64 encode/decode across all 5
affected locations in complete(), acomplete(), astream(), and
_format_contents(). Added regression tests with non-UTF-8 binary data.
Fix UnicodeDecodeError when Gemini 3.x returns non-UTF-8 binary thought_signature. Replaced UTF-8 encode/decode with base64 across all 5 affected code paths. 2 new regression tests (total: 1642). Also fixes stale version refs in docs/ARCHITECTURE.md (was 0.16.4), docs/README.md (was 0.16.0), and observer event count in docs/QUICKSTART.md (was 15, now 25).
- CONTRIBUTING.md: version 0.13.0→0.16.6, tests 938→1642, Python 3.9→3.13, models 120→146, tools 22→24, examples 27→38 - README.md: toolbox example description 22→24 - docs/modules/AGENT.md: observer event count 15→25
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Security: - Path traversal in JsonFileSessionStore — validate session_id (#9) - Unicode homoglyph bypass in injection screening — NFKD + zero-width strip + homoglyph map (#13) Data integrity: - FileKnowledgeStore._save_all() atomic write via tmp + os.replace (#10) - JsonFileSessionStore.save() atomic write (#31) Agent core: - astream() uses self._effective_model (was self.config.model) (#1) - Sync _check_policy rejects async confirm_action with clear error (#2) - Sync _streaming_call isinstance(chunk, str) guard (#18) Providers: - FallbackProvider stream()/astream() record success after consumption, not before — circuit breaker now works for streaming (#3) - Gemini response.text ValueError catch for tool-call-only responses (#4) Tools: - aexecute() uses run_in_executor(None) shared executor (#5) - execute() awaits coroutines from async tools via asyncio.run (#6) RAG: - Hybrid search O(n²) → O(1) via text_to_key dict lookup (#7) - SQLiteVectorStore thread safety + WAL mode (#8) Evals: - OutputEvaluator catches re.error on invalid regex (#11) - JsonValidityEvaluator respects expect_json=False (#12) 16 new regression tests. Full suite: 2000 passed.
johnnichev
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- Bug #2: async confirm_action guard in sync _check_policy (was overwritten by Batch 2) - Bug #8: SQLiteVectorStore WAL mode + threading.Lock (was overwritten by Batch 3) - Bug #10: FileKnowledgeStore atomic write via tmp + os.replace (was overwritten by Batch 3) - Fix SQLite test cleanup for WAL mode extra files
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Summary
UnicodeDecodeErrorwhen Gemini 3.x returns non-UTF-8 binarythought_signature— replaced UTF-8 encode/decode with base64 across all 5 affected code paths (complete(),acomplete(),astream(),_format_contents()x2)Test plan
pytest tests/ -x -q -k "ThoughtSignature"— 19 passedpytest tests/agent/test_regression.py -x -q -k "thought_signature"— 1 passedpytest tests/ -x -q -k "not e2e"— 1575 passed, 0 failedmkdocs build— no warnings (clean)black --check/isort --check/flake8— all clean🤖 Generated with Claude Code