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The Wire · Showcase

CLAUDE AGENT SDK PINS MCP DEPENDENCY BEFORE BREAKING 2.0 RELEASE

By RepoJournal · Filed · About Anthropic

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.

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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

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.

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