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frmorettoandClaude Opus 4.6 d8d5d03ef0 Initial release: Edition 1.3 — 28 tools, 3 platforms, fully verified

Claude's Hidden Toolkit documents 28 undocumented internal tools across
Claude.ai's browser, desktop app, and mobile app interfaces. All parameter
schemas and response formats are empirically confirmed through cross-platform
testing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-16 12:13:26 +01:00

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Contributing to Claude's Hidden Toolkit

Thanks for your interest in contributing! This project documents Claude.ai's undocumented internal tools — every contribution helps the community understand what's really happening under the hood.

How to Contribute

Reporting New Tools or Changes

If you've discovered a new tool, a schema change, or platform-specific behavior not covered in the book:

Open an Issue with the label discovery
Include:
- Tool name (exact internal name if known)
- Platform tested on (browser / desktop app / mobile app / iOS / Android)
- How you discovered it (e.g., tool_search query, system prompt extraction, behavioral observation)
- Parameter schema if available (JSON)
- Response format with a real example
- Any gotchas or edge cases observed

Correcting Existing Documentation

If something in the book is wrong or outdated:

Open an Issue with the label correction
Include:
- Which tool card or chapter section is affected
- What the book currently says
- What you observed instead
- Platform and date of observation

Submitting a Pull Request

For direct content changes:

Fork the repo
Edit Claude_Hidden_Toolkit.md only — this is the source of truth
Follow the existing formatting conventions (see below)
Submit a PR with a clear description of what changed and how it was verified

Formatting Conventions

Tool names in backticks: web_search, event_create_v0
Platform availability stated on every claim
Tool cards follow the template in Appendix C — don't freestyle the structure
Figures are numbered sequentially (fig_01 through fig_22+). Continue the sequence; never reuse or skip numbers
Response formats marked as confirmed with real output. If you can't confirm, note it explicitly
Tables for structured comparisons, not bullet lists

Verification Standard

This project has a strict empirical standard. We don't document tools based on speculation, hearsay, or what "should" work. Every claim must be:

Tested on at least one platform with a real Claude.ai session
Reproducible — another user should be able to trigger the same behavior
Platform-tagged — specifying exactly where it works and where it doesn't

If you've observed something but can't fully verify it, open an Issue rather than a PR. The community can help confirm.

What We're Looking For

High-value contributions include:

iOS-specific tools (Reminders suite, Siri integration) — we have limited iOS testing coverage
Screenshot captures for the 22 figures currently marked [Upcoming]
Cross-platform verification of existing tool cards on platforms we haven't tested
New deferred tools discovered via tool_search sweeps
Schema changes from Anthropic updates that break or modify existing tools
MCP Connector behavior differences between Projects and standard chats

Code of Conduct

Be respectful, constructive, and evidence-based. This is a technical documentation project — claims need proof, disagreements are settled by testing, and everyone's contributions are valued.

License

By contributing, you agree that your contributions will be licensed under CC BY 4.0, the same license as the rest of the project.

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