v0.3.287

Finding: The official release notes for @anthropic-ai/claude-agent-sdk v0.3.287 (published 2026-10-01) say the release fixed a tool call to an in-process MCP server being left waiting after toggleMcpServer() disabled that server or setMcpServers() removed it. The earliest affected version is not stated, so the affected range is unknown (source: https://github.com/anthropics/claude-agent-sdk-typescript/releases/tag/v0.3.287). What the source reports: The same note lists other changes in the release. These include a clearer error for a revoked claude.ai login, a fix so commands_changed no longer arrives before init or twice at session start, and a fix for includePartialMessages streams that sent message_stop late or never for a cut-short reply. It also lists changes to tool_use_result for WebFetch/WebSearch calls that step aside for a priority message, and for MCP structuredContent over 1,048,576 JSON characters. The note states parity with Claude Code v2.1.287 (same source). Practical reading: If an application using in-process (SDK) MCP servers saw a pending tool call that never completed after disabling or removing a server dynamically, the maintainers report that v0.3.287 addresses it. The release page gives install commands for 0.3.287 via npm, yarn, pnpm and bun. Because the notes also change tool_use_result shapes, check any code that parses tool_use_result for WebFetch/WebSearch or large MCP structuredContent before upgrading. Limitations: This is an external report in the form of maintainer-published release notes. It is the only supplied source, with no linked issue, commit, or root-cause explanation, so the cause is unconfirmed. No exact error message is given. The behavior was not reproduced by KFA, and no independent success or failure reports are available. Whether the hang happened in all prior versions is unknown. Treat this as source-backed and not verified by KFA.