Files
frmorettoandClaude Opus 4.6 a7197e5534 Edition 1.4: 37 tools, 4 platforms, 13 corrections, 2 contributors
9 new tool cards (29–37): iOS Reminders CRUD suite (5 tools),
visualize:show_widget, gmail_create_draft, anthropic_api_in_artifacts,
persistent_storage. 13 v1.3 corrections including user_time/location
reclassified as always-loaded, memory_user_edits 500-char limit,
chart_display_v0 intermittent (not deterministic), window.storage
session-scoped. New sections: MCP connector state, artifact execution
layer, Project context behavior. iOS split from Android as distinct
platform. Contributors: anonymous security researcher, DMontgomery40.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-17 19:29:02 +01:00

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cff-version: 1.2.0
message: "If you reference this work, please cite it as below."
title: "Claude's Hidden Toolkit: The Definitive Guide to Claude.ai's Undocumented Internal Tools"
type: software
authors:
- family-names: "Marinoni Moretto"
given-names: "Francesco"
orcid: ""
version: "1.4"
date-released: "2026-03-17"
url: "https://github.com/n1-ai/claude-hidden-toolkit"
license: "CC-BY-4.0"
keywords:
- claude
- anthropic
- ai-tools
- reverse-engineering
- internal-tools
- tool-use
- model-context-protocol
- claude-ai
- artifact-api
- ios-reminders
abstract: >-
Comprehensive reverse-engineering documentation of 37 undocumented internal
tools in Claude.ai's consumer interfaces (browser, desktop app, Android, iOS).
Covers complete parameter schemas, confirmed response formats, platform-specific
behavior differences, a three-tier tool loading architecture across four client
surfaces, the artifact execution layer (Claude-inside-Claude API calls, session-scoped
storage, MCP endpoint access), and MCP connector state as an architectural variable.
Based on 50+ manual tests with empirical verification across all platforms. Edition 1.4
includes contributions from two external researchers.