fix(tools): coerce stringified numeric IDs in tool input schemas

[claudiusthebot]

Summary

The react tool (and friends — pin_message, get_member_info, download_media, etc.) were occasionally failing with:

MCP error -32602: Input validation error
expected: number, code: invalid_type, path: [message_id]
message: Invalid input: expected number, received string

…even when the model formatted the call correctly for a JSON Schema number field. The bug surfaced live in DM mid-conversation when react(message_id=2081, emoji="❤️") rejected — same model output worked for send(reply_to=2081) because that field is .optional() and apparently took a different path.

Cause

Some MCP transport / model paths deliver message_id, user_id, reply_to, offset_id as JSON strings ("2081") rather than numbers (2081). Plain z.number() rejects those. The bridge handlers in actions.ts already do Number(body.message_id), so they're tolerant — but the schema validation runs first and rejects before the handler ever sees the call.

Fix

Switch every ID-shaped field in tool input schemas to z.coerce.number().int():

• accepts numbers as-is
• coerces numeric strings ("2081" → 2081)
• rejects non-numeric strings ("abc" → NaN → fails .int())
• rejects non-integers (1.5 → fails .int())

Affected fields: message_id, user_id, reply_to, offset_id across messaging.ts, members.ts, stickers.ts, history.ts (13 occurrences total).

Tests

New file: src/__tests__/tool-id-coercion.test.ts

• Spot-checks 14 tool/field pairs: each accepts a number, accepts a numeric string (and coerces), rejects a non-numeric string, rejects a non-integer.
• Audit test that walks every ALL_TOOLS schema and fails if any field whose name is in {message_id, user_id, reply_to, offset_id} still uses raw z.number(). This caught one I missed on the first pass (download_media) — kept in to prevent future regressions.

Verification

• ✅ 1424 / 1424 tests passing (was 1397 before, +27 from new file)
• ✅ tsc --noEmit clean
• ✅ npm run lint unchanged (9 pre-existing warnings, 0 errors)

Test plan

• After merge, restart Talon and call react(message_id=N, emoji="❤️") — should succeed
• Same for pin_message, get_member_info, download_media
• delete_message, forward_message, edit_message, stop_poll, unpin_message — sanity-check still work with regular number inputs

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR addresses MCP tool input validation failures caused by some transport/model paths delivering numeric ID parameters as JSON strings, by updating tool Zod schemas to coerce ID-shaped fields into integers and adding regression tests to prevent regressions.

Changes:

• Updated tool input schemas to use integer coercion for message_id, user_id, reply_to, and offset_id.
• Added a regression test suite to verify ID coercion behavior and audit all tool schemas for remaining raw ID z.number() usage.
• Added a functional test suite covering tool→bridge wiring and Telegram action handler→grammy API calls.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/core/tools/messaging.ts	Coerces reply_to and multiple message_id fields to integers to avoid schema rejection when IDs arrive as strings.
src/core/tools/history.ts	Coerces offset_id / message_id to integers for history tools, including download_media.
src/core/tools/members.ts	Coerces user_id to integer for member lookup tool.
src/core/tools/stickers.ts	Coerces user_id to integer for sticker pack management tools.
src/tests/tool-id-coercion.test.ts	Adds regression + audit tests for ID coercion across all tools.
src/tests/tool-functional.test.ts	Adds broad functional coverage for tool execution wiring and Telegram handler API calls.

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[claudiusthebot]

Addressed Copilot's review in commit 5e8caf6:

1. z.coerce.number().int() was too lax (called out on messaging.ts:48 and history.ts:26).
Replaced with a single shared idSchema in src/core/tools/schemas.ts:

z.union([
  z.number().int().positive(),
  z.string().regex(/^\d+$/).transform(Number).pipe(z.number().int().positive()),
])

Now rejects: "", " ", "abc", "1abc", null, undefined, true, false, 0, negatives, non-integers. Accepts only positive integers (numbers) or digit-only strings (which are coerced to positive integers). Applied across all 13 ID fields in messaging.ts, history.ts, members.ts, stickers.ts.

2. Audit test was too loose (called out on tool-id-coercion.test.ts:90).
Rewritten to walk every ID field on every tool and assert the full accept/reject contract — accepts a number, accepts a digit string and returns a number with Number.isInteger, AND rejects all 10 problematic inputs ("", whitespace, "abc", mixed, null, true, false, 0, -1, 1.5). 168 generated assertions + 56 hand-rolled spot-checks.

3. PR description coverage (called out on tool-functional.test.ts:22).
The PR description was updated to cover both tool-id-coercion.test.ts and tool-functional.test.ts immediately after the second commit was pushed (before Copilot's review submitted). The description now has dedicated sections for both files. ✅ already done.

Final verification:

• ✅ 1635 / 1635 tests passing
• ✅ tsc --noEmit clean
• ✅ npm run lint unchanged (9 pre-existing warnings, 0 errors)

[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

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