fix(copilot): map task and web_search to canonical Task/WebSearch

[lakshya-dhariwal]

Description

Fixes #690. COPILOT_TOOL_MAP was missing Copilot's documented task and web_search tools, so they passed through uncanonicalised - a policy matching Task or WebSearch would silently never fire on Copilot sessions. Added both entries next to the existing web_fetch: "WebFetch".

On the ask_user judgement call the issue leaves open: I left it unmapped. It has no filesystem or shell reach, so no builtin policy targets it - mapping it would add an entry nothing reads. Happy to add it if you'd rather have the map be exhaustive.

Type of Change

• Bug fix
• New feature
• Refactor
• Documentation

Checklist

• npm run lint passes (eslint on the touched files - clean)
• npx tsc --noEmit passes
• npm run test:run passes - ran the touched suite instead: npx vitest run __tests__/hooks/copilot-canonicalize.test.ts (10/10, including the two new assertions). Full test:run + build need bun, which I don't have in this environment - flagging rather than ticking a box I didn't run.
• npm run build succeeds - same bun constraint as above.

Summary by CodeRabbit

• Bug Fixes
  • Copilot tool names task and Agent are recognized as Task, and web_search as WebSearch.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0620955 and 1ef98d7.

📒 Files selected for processing (2)

• __tests__/hooks/copilot-canonicalize.test.ts
• src/hooks/types.ts

🚧 Files skipped from review as they are similar to previous changes (2)

• src/hooks/types.ts
• tests/hooks/copilot-canonicalize.test.ts

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📝 Walkthrough

Walkthrough

The Copilot tool map now maps Agent to Task. Tests cover canonicalization of task, Agent, and web_search.

Changes

Copilot Tool Name Canonicalization

Layer / File(s)	Summary
Add and test Copilot tool mappings src/hooks/types.ts, __tests__/hooks/copilot-canonicalize.test.ts	The tool map maps Copilot’s Agent tool name to Task. Tests assert that task and Agent canonicalize to Task, and web_search canonicalizes to WebSearch.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 1ef98

Copilot task calls reach policies targeting Task. No merge-blocking issue is established.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 06209

Copilot task and web-search calls will reach policies under their canonical names. The change may also stop policies written for the former raw names from matching, and it changes whether task dispatch receives semantic review. The demonstrated scope is limited to Copilot hook policy selection; no new tool privilege is shown.

Retained concerns

• Low · security · inferred: When semantic review is configured, canonicalizing task as Task changes its classification from unknown to known inert, so semantic policies that could previously be selected for the dispatch event are now skipped. The security effect depends on whether sub-agent work is independently intercepted.
• Low · security · inferred: Policies scoped to the former raw task or web_search names would stop matching after normalization. This is conditional on such policies being installed; no deployed configuration was available to establish exposure.

Security review details

Security Blast Radius

• inferred — The independently affected scope is Copilot hook events carrying these two tool names and the policies selected for those events. The evidence does not show a new credential, shell authority, or cross-service path.

Security Findings and Attack Paths

• inferred — The retained authorization finding concerns tool-name matching at task dispatch. Mapping to Task does not make Agent-only policies match; raw task also did not match Agent before this change, so that particular gap is not shown to have been introduced by the PR.

Trust Boundaries and Controls

• observed — The existing hook path still sends the normalized event through the same policy registry and evaluator. Exact matching newly enables Task- and WebSearch-scoped policies for the corresponding Copilot names.

Hardening Proposals

• proposed — Check installed raw-name policies before rollout, and explicitly test the intended Agent matcher and sub-agent semantic-review behavior rather than assuming Task normalization covers them.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the Copilot mapping change and the canonical tool names. It does not mention the additional Agent mapping, but it accurately summarizes the primary objective.
Description check	✅ Passed	The description includes the required sections, explains the bug and fix, identifies the treatment of ask_user, and reports the completed and unavailable checks. The unchecked full test and build step…
Linked Issues check	✅ Passed	Issue #690 requires task: "Task", web_search: "WebSearch", and a test for Copilot task canonicalization. src/hooks/types.ts contains both mappings and also maps Copilot Agent events to `Task…
Out of Scope Changes check	✅ Passed	The changes stay within issue #690. The source changes implement canonical tool mappings for the requested Copilot tools and the reported payload form. The test changes verify those mappings. No unrel…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…

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🔧 ESLint

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__tests__/hooks/copilot-canonicalize.test.ts

ESLint skipped: missing config or dependency (missing-dependency). The ESLint configuration references a package that is not available in the sandbox.

src/hooks/types.ts

ESLint skipped: the matched ESLint configuration already failed (missing-dependency).

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_{A rabbit checks the tool-name trail,
Agent joins Task without fail.
web_search finds its proper name,
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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In @src/hooks/types.ts:
- Line 283: Update the Copilot tool-name alias map containing the `task` entry
so `Agent` canonicalizes to `Task`. Add a regression test confirming
`canonicalizeToolName("Agent", "copilot")` returns `Task`.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: d7dd99bd-7ebd-4578-a202-a117cce534d2

📥 Commits

Reviewing files that changed from the base of the PR and between e40de6c and 0620955.

📒 Files selected for processing (2)

• __tests__/hooks/copilot-canonicalize.test.ts
• src/hooks/types.ts

Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 7 remain after this review.

[lakshya-dhariwal]

Good catch, and valid. Checked the hooks reference to be sure: PascalCase PreToolUse payloads report tool_name as the Claude tool name, and the table maps the runtime task tool to Agent there (https://docs.github.com/en/copilot/reference/hooks-reference). Since this integration registers the PascalCase events, Agent is the name that actually arrives - so task: "Task" alone didn't close the hole.

Added Agent: "Task" to the map plus a regression test in 1ef98d7.