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wire 2026-06-11
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CLAUDE AGENT SDK PINS MCP DEPENDENCY BEFORE BREAKING 2.0 RELEASE

By RepoJournal · Filed · About Anthropic · Composed from the cited sources · methodology

maxisbey
1 person shipped this
maxisbey @maxisbey 1 cited

Claude Agent SDK locked down its MCP dependency to prevent silent breakage when the Model Context Protocol ships its 2.0 release with incompatible handler registration changes.

The Python SDK v0.2.96 [1] pinned mcp to <2.0.0 [2] after identifying three surfaces with no cross-major stability guarantee: the low-level server handler registration, request routing, and Tool meta serialization. Without the constraint, existing installs would break the day MCP 2.0 ships. The TypeScript SDK [3] and Claude Code [4] shipped follow-up releases in parity, with the TypeScript variant now accepting per-plugin MCP discovery toggles [5] so hosts can manage connections independently. Claude Code v2.1.173 [4] also fixed Fable 5 model names with the [1m] suffix being incorrectly parsed and resolved a Windows sandbox warning. The bundled Claude CLI bumped to 2.1.173 across all SDKs, and claude-code-action [6] dropped a Bun tsconfig override that was causing runtime crashes.

Action items

References

  1. [1] v0.2.96 ↗ anthropics/claude-agent-sdk-python
  2. [2] deps: pin mcp below 2.0.0 ↗ anthropics/claude-agent-sdk-python
  3. [3] v0.3.173 ↗ anthropics/claude-agent-sdk-typescript
  4. [4] v2.1.173 ↗ anthropics/claude-code
  5. [5] v0.3.172 ↗ anthropics/claude-agent-sdk-typescript
  6. [6] v1.0.143 ↗ anthropics/claude-code-action

$ ls anthropics/reviews/ # the step-back reads

the week in review Claude Code symlink TOCTOU allows arbitrary file write the month in review Sandbox and SDK holes dominate Anthropic's September
Full archive → Weekly reviews →

Quick answers

What shipped in Anthropic on June 11, 2026?
Claude Agent SDK locked down its MCP dependency to prevent silent breakage when the Model Context Protocol ships its 2.0 release with incompatible handler registration changes. In total, 13 commits, 1 pull requests, and 8 releases landed.
Who contributed to Anthropic on June 11, 2026?
1 developer shipped this update, including maxisbey.
What were the notable Anthropic updates?
v0.2.96, deps: pin mcp below 2.0.0, and v0.3.173.
♥

$ log @anthropics --recent

sandbox-runtime fixes a quadratic glob parse, and five projects enroll in OSS Scanner 52 shipped buffa breaks inferred collect() calls, sandbox-runtime fixes the proxy and Linux relays 120 shipped Buffa hardens codegen and descriptor validation, OSS Scanner enrolls WordPress and the AT Protocol stack 26 shipped security-guidance findings reach stderr, and sandbox ignoreViolations types match the CLI 28 shipped

$ log --all # elsewhere on the wire

Alignment & Post-training verl rejects conflicting vLLM engine_kwargs, open-instruct adds MILES OPD behind a Megatron learner Interpretability nnsight 0.8.0 cuts import time from 7.6s to 1.6s

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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