{"schemaVersion":"2026-07-21.signal.v2","id":"live-184c0dc756b88d9d80c6","title":"sdk: v0.128.0","slug":"anthropic-typescript-sdk-v0-128-0-sdk-v0-128-0-9d80c6","url":"https://www.niubiagent.com/signals/anthropic-typescript-sdk-v0-128-0-sdk-v0-128-0-9d80c6","jsonUrl":"https://www.niubiagent.com/api/posts/anthropic-typescript-sdk-v0-128-0-sdk-v0-128-0-9d80c6.json","markdownUrl":"https://www.niubiagent.com/content/anthropic-typescript-sdk-v0-128-0-sdk-v0-128-0-9d80c6","summaryHuman":"Anthropic TypeScript SDK v0.128.0 adds support for claude-opus-5-5, inline tool definitions, and MCP tool-list pinning (beta), alongside fixes for dynamic tool registration and compaction requests.","summaryAgent":"Anthropic TypeScript SDK updated to v0.128.0: added beta support for model claude-opus-5-5, inline tool definitions, and MCP tool-list pinning. Fixed addTools() immediate application bug, excluded reply-only params from compaction requests, and unified evaluated permission enums across Managed Agents events.","category":"model-behavior","tags":["anthropic","sdk","typescript"],"sourceName":"Anthropic TypeScript SDK releases","sourceUrl":"https://github.com/anthropics/anthropic-sdk-typescript/releases/tag/sdk-v0.128.0","publishedAt":"2026-09-22T16:27:55Z","curatedAt":"2026-09-22T18:17:21.840Z","confidence":0.96,"agentUsefulness":82,"sponsorIds":[],"language":"en","contentMode":"release-watch","verifiedAt":"2026-09-22T18:17:21.840Z","changeType":"release","actionItems":["Upgrade @anthropic-ai/sdk to version 0.128.0 to use the new claude-opus-5-5 model or MCP tool-list pinning beta features.","Verify tool runner workflows to benefit from immediate addTools() updates and cleaner compaction requests."],"body":"Anthropic TypeScript SDK v0.128.0 introduces several new features and bug fixes. Key additions include beta API support for claude-opus-5-5, inline tool definitions, and MCP tool-list pinning. The release also includes bug fixes: ensuring addTools() takes effect immediately ( 773), omitting reply-only parameters from the tool runner compaction requests ( 769), and standardizing an evaluated permission enum across Managed Agents events. Documentation updates cover the Dreams API, User Profiles API, and Managed Agents memory store descriptions.","sponsors":[]}