Issues

• AnthropicBedrock 2.x sends anthropic_version: 2026-10-21, which Bedrock rejects for Claude Sonnet 4.5, Opus 4.5 and Opus 4.6

  anthropics/anthropic-sdk-python#2031 · Filter by author DouweM opened on Oct 22, 2026

• API returns Claude Sonnet 4.5 as not deprecated in ModelInfo

  anthropics/anthropic-sdk-python#2029 · Filter by author Shulyaka opened on Oct 20, 2026
  1

• Fix test collection and execution errors on Windows (geteuid, FileStore skip, bedrock tempfile lock)

  anthropics/anthropic-sdk-python#2027 · Filter by author prasad2512 opened on Oct 19, 2026

• Self-hosted managed agent sessions fail after ~60 minutes when sessions_token expires, and environment key fallback cannot access memory stores

  anthropics/anthropic-sdk-python#2026 · Filter by author carlitosgomes79 opened on Oct 18, 2026

• Bedrock: anthropic_beta body field keeps whitespace and empty entries from the anthropic-beta header

  anthropics/anthropic-sdk-python#2023 · Filter by author sebxt opened on Oct 18, 2026

• _should_retry_exception correctly refuses to retry a cancellation, but the inner request frame wraps it in APIConnectionError first, so the guard never sees it

  anthropics/anthropic-sdk-python#2018 · Filter by author dilenworsoff opened on Oct 12, 2026
  1

• transform_schema drops description beside $ref, which the API accepts and follows

  anthropics/anthropic-sdk-python#2016 · Filter by author mihiarc opened on Oct 11, 2026
  1

• False positive safety block on structural biology: Protein coordinate validation

  anthropics/anthropic-sdk-python#2013 · Filter by author julgrandvallet opened on Oct 10, 2026

• Concurrent async tool-response requests execute the same tool multiple times

  anthropics/anthropic-sdk-python#1994 · Filter by author sylvesterkaczmarek opened on Oct 6, 2026

• Generator-backed tool input examples disappear from follow-up requests

  anthropics/anthropic-sdk-python#1990 · Filter by author sylvesterkaczmarek opened on Oct 6, 2026

• Tool runner replaces caller container settings with the response ID

  anthropics/anthropic-sdk-python#1988 · Filter by author sylvesterkaczmarek opened on Oct 6, 2026

• A compaction delta without encrypted_content clears the accumulated metadata

  anthropics/anthropic-sdk-python#1984 · Filter by author sylvesterkaczmarek opened on Oct 5, 2026

• Async context-manager tools leak entered resources when callable validation fails

  anthropics/anthropic-sdk-python#1977 · Filter by author sylvesterkaczmarek opened on Oct 5, 2026

• Bug: _chunk_bytes_to_sse raises AttributeError when chunk.get('bytes') is None in Bedrock stream decoder

  anthropics/anthropic-sdk-python#1975 · Filter by author chauvuusvn opened on Oct 5, 2026
  3

• Repeated event_start resets an accumulated or completed session message

  anthropics/anthropic-sdk-python#1970 · Filter by author sylvesterkaczmarek opened on Oct 4, 2026

• Messages API: text after a tool_result is held for several seconds, then sent in one burst (claude-sonnet-5-5)

  anthropics/anthropic-sdk-python#1960 · Filter by author rohanlad opened on Sep 29, 2026
  2

• Claude Sonnet 4.6 doesn't call tools properly when thinking + structured output is used

  anthropics/anthropic-sdk-python#1949 · Filter by author minhduc0711 opened on Sep 24, 2026

• Managed Agents: make SessionToolRunner's per-tool-call TOOL_TIMEOUT (150 s) configurable on EnvironmentWorker

  anthropics/anthropic-sdk-python#1948 · Filter by author hlee-cb opened on Sep 24, 2026
  1

• Expose remaining prepaid credit balance (endpoint, error body, or low-balance webhook)

  anthropics/anthropic-sdk-python#1942 · Filter by author paul-schappert opened on Sep 20, 2026
  2

• Batch result decoders leave responses open after parsing or transport errors

  anthropics/anthropic-sdk-python#1928 · Filter by author betacatsling opened on Sep 11, 2026

• Sonnet 5 strict tool calls double-escape Unicode and introduce control characters into copied text

  anthropics/anthropic-sdk-python#1926 · Filter by author crayola opened on Sep 10, 2026

• Sonnet 5 strict tool use returns a string for an array-typed property

  anthropics/anthropic-sdk-python#1925 · Filter by author crayola opened on Sep 10, 2026

• Transport errors while consuming a stream escape as raw httpx exceptions instead of APITimeoutError / APIConnectionError

  anthropics/anthropic-sdk-python#1919 · Filter by author HardMax71 opened on Sep 7, 2026
  1

• Mid-stream error events still raise APIStatusError with status_code=200 (#1258 closed without a fix)

  anthropics/anthropic-sdk-python#1918 · Filter by author HardMax71 opened on Sep 7, 2026

• Three symlink tests in test_agent_toolset.py are missing the needs_symlinks marker

  anthropics/anthropic-sdk-python#1915 · Filter by author iam-kira opened on Sep 6, 2026
  3