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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

2.2 KiB

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AGENTS.md — Context for AI Coding Agents

What This Repo Is

A technical book ("Claude's Hidden Toolkit") documenting 28 undocumented internal tools in Claude.ai's consumer interfaces. Fully reverse-engineered through systematic testing across browser, desktop app, and mobile app.

File Roles

File	Role	Editable?
`Claude_Hidden_Toolkit.md`	Source of truth	Yes — all content changes here
`README.md`	GitHub landing page	Yes
`LICENSE`	CC BY 4.0	No

Domain Knowledge

28 tools documented with confirmed JSON schemas
3 platforms with different tool inventories (browser: 21 tools, desktop: 22+32 MCP, mobile: 20+11 deferred)
Tool cards in the Technical Annex follow a strict template (see Appendix C in the book)
Figures are numbered sequentially fig_01 through fig_22 — all currently marked [Upcoming] pending screenshot capture
Response formats are all empirically confirmed — no inferred markers remain

Conventions

Tool names in backticks: web_search, event_create_v0
Platform tags on every claim: "Mobile App only", "Browser + Desktop only", "All"
Version suffixes: _v0 (initial/experimental), _v1 (breaking upgrade)
Confirmed vs unverified clearly marked — never speculate

Architecture Context

The book documents a two-tier tool loading system:

Always-loaded tools: injected into every conversation context (~17-22 depending on platform)
Deferred tools: discovered at runtime via tool_search (mobile only, 11 consumer tools)
MCP tools: discovered via tool_search on desktop only (32 integration tools)

The calendar system has a dual-layer architecture where Projects use MCP Connector tools with email-based IDs, while standard mobile chats use deferred consumer tools with numeric string IDs. The two layers are incompatible.

Quality Gates

Before any content change:

Has the claim been tested on the relevant platform(s)?
Is the platform availability clearly stated?
Does the tool card follow the template structure?
Are figure numbers sequential with no gaps?
Is the response format marked as confirmed or unverified?

2.2 KiB Raw Blame History