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Do MCP tools serialize in Claude Code? Empirical study: readOnlyHint controls parallelism, IPC overhead is ~5ms/call. Reproduces #14353.
5 starsPython
MCP tools do parallelize in Claude Code (study with raw data)
by greynewell·Feb 12, 2026·1 point·0 comments
AI Analysis
●MidBig Brain
Benchmarks readOnlyHint's impact on MCP parallelism, but archived before yielding actionable best practices.
Strengths
- •Rigorous IPC overhead measurement (5ms/call median) with raw JSON-RPC traces differentiates from hand-waving
- •Identified readOnlyHint as the serialization control mechanism before Anthropic documented it clearly
Weaknesses
- •n=5 sample size (astropy only) makes findings noise, not generalizable guidance
- •Archived Feb 2026 with no follow-up; unclear if findings shaped MCP adoption or Claude Code behavior
Category
Target Audience
MCP server authors, Claude Code users, researchers studying AI tool parallelism
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