Observed arrival · 2026-10-20

ToolTune’s Cross-Agent MCP Simulator

tooltune.dev Visit website

Editorial interest 76/100 Selection signal · not a rating of the site

An MCP gateway routes agent-specific tool definitions, while a simulator compares how different agents handle the same request.

Landing page captured for the 2026-10-20 issue.

For: MCP server maintainers testing agent-specific tool schemas
Worth noticing: The trace contrasts Claude Code’s `book_lesson` call with Codex CLI’s `create_reservation` for the same request.

Field notes

The page presents a gateway that fingerprints the calling client and routes `tools/list` responses per agent, without requiring changes to tool handlers. Its example traces one request across Claude Code and Codex CLI: one selects `book_lesson`, the other `create_reservation`, producing different outcomes. A simulator section describes repeated paraphrased customer requests and fresh Codex runs after an analyst proposes a revised definition.

Observed signals

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

◎NicheUnusually specific use

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