Issues

• setMessagesParams lets the tool runner append turns into caller-owned history arrays

  anthropics/anthropic-sdk-typescript#1255 · Filter by author sylvesterkaczmarek opened on Oct 6, 2026

• MessageStream.emitted promises remain pending after the stream is aborted

  anthropics/anthropic-sdk-typescript#1253 · Filter by author sylvesterkaczmarek opened on Oct 6, 2026

• Fallback state is pinned to models that refuse or fail before serving a response

  anthropics/anthropic-sdk-typescript#1251 · Filter by author sylvesterkaczmarek opened on Oct 6, 2026

• Streaming fallback middleware retains abort listeners after completion and cancellation

  anthropics/anthropic-sdk-typescript#1249 · Filter by author sylvesterkaczmarek opened on Oct 5, 2026

• MessageStream async iteration silently completes when an error occurs between reads

  anthropics/anthropic-sdk-typescript#1247 · Filter by author sylvesterkaczmarek opened on Oct 5, 2026

• Synchronous token-provider failures bypass advisory recovery and refresh deduplication

  anthropics/anthropic-sdk-typescript#1245 · Filter by author sylvesterkaczmarek opened on Oct 5, 2026

• SessionToolRunner repeats completed tool side effects after result delivery fails

  anthropics/anthropic-sdk-typescript#1243 · Filter by author sylvesterkaczmarek opened on Oct 5, 2026

• Schema transformation discards sibling type and composition constraints

  anthropics/anthropic-sdk-typescript#1241 · Filter by author sylvesterkaczmarek opened on Oct 4, 2026

• Replayed preview starts overwrite completed managed-agent messages

  anthropics/anthropic-sdk-typescript#1236 · Filter by author sylvesterkaczmarek opened on Oct 3, 2026

• Late preview deltas modify authoritative managed-agent messages

  anthropics/anthropic-sdk-typescript#1234 · Filter by author sylvesterkaczmarek opened on Oct 3, 2026

• EnvironmentWorker cannot be created with the Client class from @anthropic-ai/aws-sdk

  anthropics/anthropic-sdk-typescript#1215 · Filter by author cm-iwata opened on Sep 27, 2026

• jsonSchemaOutputFormat drops constraints for array-form types (nullable objects)

  anthropics/anthropic-sdk-typescript#1212 · Filter by author KrishnaRMaddikara opened on Sep 24, 2026

• BetaLocalFilesystemMemoryTool: rename of the /memories root is not rejected, and unmapped filesystem errors (EINVAL, ENOTDIR) expose the host path to the model

  anthropics/anthropic-sdk-typescript#1182 · Filter by author lukehutch opened on Sep 9, 2026

• Memory tool: two edits to one file in the same turn silently lose one (BetaToolRunner runs tool calls concurrently; BetaLocalFilesystemMemoryTool has no serialization)

  anthropics/anthropic-sdk-typescript#1181 · Filter by author lukehutch opened on Sep 9, 2026

• BetaLocalFilesystemMemoryTool.str_replace: a multi-line old_str never matches, and an omitted new_str writes the word "undefined"

  anthropics/anthropic-sdk-typescript#1180 · Filter by author lukehutch opened on Sep 9, 2026

• Retrying a request with a single-use stream body silently sends a 0-byte body and reports success

  anthropics/anthropic-sdk-typescript#1170 · Filter by author acartag7 opened on Aug 27, 2026
  1

• BetaMessageStream: compaction_delta coerces a null content into the literal string "null", and a null encrypted_content erases the established checkpoint

  anthropics/anthropic-sdk-typescript#1164 · Filter by author tonydzi opened on Aug 24, 2026
  2

• helpers.md: tool runner method heading is missing the .beta segment

  anthropics/anthropic-sdk-typescript#1141 · Filter by author latent-9 opened on Aug 5, 2026
  2

• Managed Agents egress gateway omits SNI on upstream TLS to Cloudflare R2 (503 HANDSHAKE_FAILURE_ON_CLIENT_HELLO)

  anthropics/anthropic-sdk-typescript#1125 · Filter by author sdmcraft opened on Jul 20, 2026
  2

• Citations: raw <cite index="N-M"> markup leaks into text blocks instead of being parsed into citations (search_result blocks)

  anthropics/anthropic-sdk-typescript#1119 · Filter by author vcorral-gsv opened on Jul 16, 2026
  9

• transformJSONSchema drops const/enum into description text, breaking discriminated unions in tool inputs

  anthropics/anthropic-sdk-typescript#1116 · Filter by author leonardomalzacher opened on Jul 8, 2026
  2

• idempotencyKey is a silent no-op: base Anthropic client never sets idempotencyHeader

  anthropics/anthropic-sdk-typescript#1112 · Filter by author lnvestor opened on Jul 7, 2026
  1

• always_allow permission policy not honored for agent.custom_tool_use MCP tool calls (Managed Agents beta)

  anthropics/anthropic-sdk-typescript#1099 · Filter by author ALW14 opened on Jun 23, 2026
  1

• Adopt TracingChannel for observability

  anthropics/anthropic-sdk-typescript#1036 · Filter by author logaretm opened on May 11, 2026
  2

• [Vertex] anthropic-beta header forwarded to countTokens fallback fails on lagging model backends

  code-change
  anthropics/anthropic-sdk-typescript#1016 · Filter by author this-fifo opened on Apr 27, 2026