claude-hidden-toolkit/CHANGELOG.md

Changelog

All notable changes to Claude's Hidden Toolkit are documented here.

Format follows Keep a Changelog. Editions are tagged by version.

[1.4] — 2026-03-15

Added

• 9 new tool cards (Cards 29–37): reminder_list_search_v0, reminder_create_v0, reminder_search_v0, reminder_update_v0, reminder_delete_v0 (iOS Reminders CRUD suite), visualize:show_widget, gmail_create_draft, anthropic_api_in_artifacts, persistent_storage
• Artifact execution layer section (Chapter 9) — documents Claude-inside-Claude architecture: anthropic_api_in_artifacts (authenticated API calls from artifacts without API key), persistent_storage (session-scoped window.storage), MCP endpoint access from React artifacts
• MCP connector state as an architectural variable (Chapter 2) — connecting/disconnecting Gmail or Google Calendar changes the always-loaded tool pool
• Project context behavior section — confirmed Projects do not change tool behavior
• Ghost tools section (Chapter 12) — gmail_send_draft and gmail_modify_thread exist in schema but are not deployed
• Contributors section — credited anonymous security researcher (11 findings) and DMontgomery40 (iOS Reminders suite)
• iOS vs Android differences — user_location_v0 returns richer response on iOS (sub_locality, accuracy fields); user_time_v0 timestamp format differs (no microseconds on iOS)

Changed (Corrections)

• user_time_v0 and user_location_v0: reclassified from deferred to always-loaded on mobile — MCP connector state is irrelevant (v1.3 error)
• memory_user_edits: limit corrected from 200 characters (server-enforced) to 500 characters (client-side validation). The limit may vary by tier or build
• chart_display_v0: crash status downgraded from deterministic (100%) to intermittent/state-dependent. Tool is always deferred on mobile, not first-class
• tool_search on browser: corrected from "does not exist" to conditionally available when MCP connectors are active, returning tools with Provider:tool_name prefix
• window.storage: reframed from "persistent" to session-scoped — data is destroyed when session closes, does not persist across chats even within the same Project
• anthropic_api_in_artifacts: corrected from Desktop-only to working on both Desktop and Browser React artifacts (HTML artifacts blocked by CSP)
• web_fetch: corrected from 8 to 9 parameters (added html_extraction_method)
• bash_tool: corrected from 1 to 2 parameters (added required description)
• str_replace: corrected from 3 to 4 parameters (added required description)
• chart_display_v0 values parameter: accepts integers on iOS (v1.3 documented strings only)
• Calendar tools: always-loaded when MCP Calendar connector active (not always deferred)
• Platform matrix: updated to reflect iOS as distinct surface with 5 additional Reminders tools
• visualize:show_widget vs chart_display_v0: documented as mutually exclusive by surface — chart_display_v0 mobile only, show_widget desktop/browser only

Removed

• Deterministic crash claim for chart_display_v0
• "tool_search absent on browser" claim
• 200-character server-enforced limit claim for memory_user_edits

[1.3] — 2026-02-16

Added

• Platform Architecture section (new Chapter 2.5) — tool inventory matrix across browser (21 tools), desktop app (22+32 MCP), and mobile app (20+11 deferred)
• 3 new tool cards: weather_fetch (Card 26), recipe_display_v0 (Card 27), end_conversation (Card 28)
• Platform-exclusive tools table showing which tools exist where
• Session instability warning (switching clients changes available tools)
• Fallback behavior documentation for each platform gap
• Settings & Connectors reference integrated into appendix
• 9 new figure placeholders (fig_14 through fig_22)

Changed

• Chapter 10 (Discovery Log): added mobile-only environment note — the discovery log was produced on mobile and is not reproducible on browser or desktop
• Chapter 2 (Architecture): rewritten to reflect three platform configurations instead of a single binary always-loaded/deferred model
• Card 5 (message_compose_v1): corrected primary button to "Send via Gmail", documented dropdown with "Open in Mail", added no-recipient-field note
• Card 4 (ask_user_input_v0): added "Something else" free-text option, Skip button, keyboard shortcuts, selection counter, drag handles, pagination
• Cards 17/18 (places): added markers mode sidebar details, itinerary mode routing, "Open route" Google Maps behavior, confirmation dialog inconsistency
• Card 6 (alarm_create_v0): confirmed mobile-only, added widget description with Italian locale, removed web/desktop speculation
• Card 7 (timer_create_v0): confirmed mobile-only, added widget description
• Card 1 (user_time_v0): added platform behavior differences (mobile returns exact time, desktop/browser states system date only)
• Card 3 (user_location_v0): confirmed mobile-only, documented two-layer permission system (Claude app + Android OS)
• Card 10 (chart_display_v0): confirmed mobile-only deferred, added app crash warning
• Card 25 (tool_search): major rewrite — browser has no tool_search, desktop finds MCP only, mobile finds consumer tools
• Cards 8–13 (Calendar suite): added mobile-only deferred status, Google Calendar connection requirement
• Appendix A: corrected availability matrix to reflect cross-platform testing results
• All response formats upgraded from (inferred) to empirically confirmed
• Figure numbering made sequential (fig_01 through fig_22, eliminated fig_14b)

Removed

• All (inferred) response format markers — every schema now confirmed through testing
• Speculative web/desktop availability claims for mobile-only tools
• Screenshot capture instructions from figure placeholders

[1.2] — 2026-02-13

Added

• Technical Annex with 25 detailed tool cards
• Appendix C: Tool Template for New Discoveries
• Figure placeholders with capture instructions
• Companion GitHub repository

Changed

• Expanded Chapter 10 Discovery Log with full query-by-query enumeration
• Added environment note about tool_search behavior in Projects vs standard chats

[1.1] — 2026-02-10

Added

• Complete parameter schemas for all 25 tools
• Cross-reference with prior research (Khemani, Willison, Adversa AI, Viticci)
• Discovery methodology (Appendix B)

Changed

• Restructured from flat tool list to chapter-based organization

[1.0] — 2026-02-07

Added

• Initial release documenting 25 internal tools
• Two-tier architecture analysis (always-loaded vs deferred)
• tool_search enumeration methodology
• Availability matrix (Appendix A)