Anthropic Python SDK 1.6.0 release notes, 15 Sep 2026

Full Changelog: v1.5.0...v1.6.0

api: add auto mode tool permissions for Managed Agents (909d92f)
api: add compaction parameter and signed compaction blocks (beta) (8689179)
api: add enum types for workspace data-residency geo fields (3dc6dbf)
api: add thinking_mismatch_allowed entries to input_transformations (beta) (14d1792)
api: add url_sources to the web fetch tool (4ba7115)
api: add workspace_id parameter to user profiles methods (1c359b2)
client: support async credential token providers (95e93f7)

api: mark usage iteration model as nullable (520d000)
api: use one input transformation type for message and delta event (ae86d7d)
client: honor Retry-After values above 60 seconds (2d03ba2)
client: ignore invalid Retry-After values and validate maxRetries (909d92f)
client: retry connection errors in the async client and stop blocking in the coroutine retry loop (909d92f)
client: use the default backoff when Retry-After is out of range (3d15f04)

deps: bump aiohttp, pygments and pytest in the dev lockfile (005ad11)
deps: require anyio 4.1 or later (79b4175)
docs: clarify that session_thread_id on tool use events is informational (2ac7b60)
docs: correct the compaction beta's parameter descriptions (5048c9a)
internal: sort the imports in beta_message.py (0a92f91)
tests: define the model tests' type alias at module level (98c3a7a)
tests: stop the mock server without failing a passing test run (d28aea7)

api: clarify usage.iterations entry typing under server-side fallback (bb06629)
stop documenting unions with their first variant's description (7a94250)
use markdown formatting in most docstrings (25f344f)