Issues

• 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

• MCP helpers reject or skip supported content with mixed-case or parameterized MIME types

  anthropics/anthropic-sdk-python#1986 · Filter by author sylvesterkaczmarek opened on Oct 5, 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

• A leading UTF-8 BOM prevents streaming messages from reading the first event

  anthropics/anthropic-sdk-python#1982 · 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

• Repeated event_start resets an accumulated or completed session message

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

• TextEvent.parsed_snapshot() raises ValueError on ordinary text (and on the empty first delta), and its return annotation is wrong for non-object JSON

  anthropics/anthropic-sdk-python#1961 · Filter by author feiiiiii5 opened on Sep 29, 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

• streaming: a later message_delta that omits stop_reason resets it to None (container is guarded, the stop_* fields are not)

  anthropics/anthropic-sdk-python#1940 · Filter by author feiiiiii5 opened on Sep 18, 2026
  1

• 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

• beta_tool generates a type: array input_schema and an uncallable tool for positional-only parameters (and *args)

  anthropics/anthropic-sdk-python#1911 · Filter by author azrabano23 opened on Sep 4, 2026

• Messages.parse (and AsyncMessages.parse) don't take cache_control?

  anthropics/anthropic-sdk-python#1907 · Filter by author jheiss opened on Sep 3, 2026

• Asynchronous identity_token_provider to WorkloadIdentityCredentials

  anthropics/anthropic-sdk-python#1901 · Filter by author jheiss opened on Sep 1, 2026
  3

• Add an explicit authentication mode to AnthropicBedrockMantle

  anthropics/anthropic-sdk-python#1893 · Filter by author gouveags opened on Aug 28, 2026
  3