Claude Code v2.1.91 — MCP goes big, plugins go native
| ● New release | April 3, 2026 |
v2.1.91
MCP goes big, plugins go native, editing gets leaner — four targeted upgrades that make Claude Code more capable and more efficient.
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MCP Results: Up to 500K Characters
MCP tools now support the maxResultSizeChars annotation, letting servers declare they can return results up to 500,000 characters. This unlocks serious use cases — large codebases, database dumps, full document ingestion — all flowing through a single tool call without chunking workarounds.
🎯Features
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Plugin bin/ executables in Bash
Plugins can now ship executables in a bin/ directory that become callable directly from Bash inside Claude Code. No more MCP wrappers for simple CLI tools — just drop a binary and go.
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MCP maxResultSizeChars annotation
New annotation field lets MCP servers advertise their maximum result size, enabling Claude Code to handle responses up to 500K characters from capable servers.
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⚡Improvements
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Edit tool: shorter old_string anchors
The edit tool now uses shorter old_string anchors for matching, consuming fewer tokens per edit operation. Same precision, less overhead — your context window will thank you.
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disableSkillShellExecution setting
New config option disableSkillShellExecution lets you prevent skills from running shell commands. Useful for locked-down environments where you want skill intelligence without arbitrary code execution.
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💡Pro Tip
If you're building MCP servers, add the maxResultSizeChars annotation to your tool definitions. Claude Code respects it up to 500K — no more splitting large outputs across multiple calls. Pair it with plugin bin/ executables for tools that work better as standalone CLIs than JSON-RPC handlers.
Auto-curated from the official changelog · cc.storyfox.cz · by @phasE89
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