fix: align codebase search readiness across mode filters

[WebMad]

Summary

Depends on #1622.

• Move the search readiness rejection in isToolAllowedInMode before the always-available branch: search belongs to the read group, so the old check was unreachable.
• Reject missing, disabled, unconfigured, or uninitialized managers and explicitly disabled search; a ready manager still goes through mode permissions.
• Preserve the existing optional-manager API. No workspace-scope migration, registry refactor, task builder production changes, or sibling search fix.

Regression proof and coverage

• Ran the new filter regression suite against the unchanged parent production guard: 13 failed, 2 passed, with the single-tool API incorrectly returning true.
• After the fix: 57 tests passed across 5 suites, including existing filtering and tool-permission tests.
• New filter cases cover an absent manager, all eight readiness flag combinations with all three filter APIs agreeing, ordinary read tools remaining available, each live flag toggling, alternating managers, a custom mode without read access, and explicitly disabled search.
• New task builder integration coverage uses the real builder/native definitions/filter and a mocked registry. It checks task cwd and provider context, missing/unready/ready managers, manager switching and live flags, mode and disabled-tool restrictions, and both normal and all-definitions-with-restrictions paths. The latter asserts callable names while retaining historical tool definitions.

Validation

• Focused Vitest from the extension package: npx vitest run core/prompts/tools/__tests__ core/task/__tests__/build-tools-readiness.integration.spec.ts core/task/__tests__/native-tools-filtering.spec.ts core/tools/__tests__/validateToolUse.spec.ts — 57/57 passed; rerun after formatting also passed.
• Changed-file ESLint with suppression pruning and zero warnings passed. All parsed suppression counts are unchanged (production filter: 3 existing; new test files: 0); generated suppression-file formatting noise was reverted.
• Prettier check and staged whitespace validation passed.
• Extension typecheck passed.
• Normal pre-commit formatting and monorepo lint passed (11 tasks, 10 cached).
• Normal pre-push monorepo typecheck passed (11 tasks, 10 cached). Hooks were not skipped.

Dependency / isolated diff

Branched directly from #1622 head 8637e48, not from the sibling workspace-search branch. Rechecked #1622 before publishing: still open/unmerged at that revision.

This PR targets upstream main as requested, so its current main-based diff also includes the unmerged parent commits. The isolated follow-up is c4f0f8a, changing only three files. Review that commit for this fix; merge #1622 first and rebase the follow-up if the parent is squash-merged to avoid duplicate parent commits. No modifications were made to #1622, #1628, or #1629.

Limitations

Checks ran on macOS with Node 24.7.0, while the repository requests 22.23.1. Existing Vite file-URL and Prettier unknown-option warnings were emitted. CI remains authoritative. No full repository test run, measured coverage percentage, or manual/real extension-host E2E smoke test is claimed; the integration test is package-local with a mocked registry.

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src/core/tools/__tests__/validateToolUse.spec.ts (1)

3-3: LGTM!

Also applies to: 52-73

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📝 Summary

Summary by CodeRabbit

• Tests
  • Added coverage confirming codebase search is available only when indexing is enabled, configured, and initialized.
  • Verified search availability updates when indexing readiness changes and remains isolated across contexts.
  • Confirmed standard file-reading tools remain available in supported modes and can be independently disabled.
  • Added coverage for read-only and command-only mode restrictions, no-read mode, disabled tools, and task context when determining tool availability.

Walkthrough

The pull request adds unit and integration tests for codebase_search readiness. The tests cover manager readiness flags, live state changes, mode restrictions, disabled tools, registry context propagation, task tool construction, and custom mode validation.

Changes

Codebase search readiness validation

Layer / File(s)	Summary
Tool policy readiness tests src/core/prompts/tools/__tests__/codebase-search-readiness.spec.ts	Tests verify manager presence, readiness flags, live flag changes, manager isolation, mode restrictions, ordinary read-tool availability, and disabledTools handling.
Task tool readiness integration src/core/task/__tests__/build-tools-readiness.integration.spec.ts	Integration tests verify registry lookup context, readiness-based codebase_search inclusion, mode-specific read-tool inclusion, retained definitions, and explicit exclusions.
Custom mode validation src/core/tools/__tests__/validateToolUse.spec.ts	Tests verify that codebase_search is allowed in a read-only custom mode and rejected in a command-only custom mode. The tool name uses toolNamesSchema.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Merge Risk: 🟡 Moderate · up to 64dbc

Workspaces sharing a path can receive codebase-search results or readiness state from another workspace. Resolve the registry identity issue before merging.

🚥 Pre-merge checks | ✅ 8

✅ Passed checks (8 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Regression Evidence	✅ Passed	PASS: The reviewed range changes only three test files; no production behavior or visible UI changes are introduced. The added tests exercise the public filter, policy, task-builder, and mode-validati…
Security Boundaries	✅ Passed	PASS. The reviewed range changes only three test files under __tests__; no production path changes. The added code uses fixed test fixtures, mocked managers, and assertions. It does not handle secre…
Persistence Integrity	✅ Passed	The review-scoped diff changes only three test files. It adds in-memory readiness fixtures, mocked CodeIndexManagerRegistry calls, and assertions; it does not add or modify a persistence path, write…
Lifecycle Resource Cleanup	✅ Passed	PASS: The authoritative PR range changes only three test files; no production lifecycle path changes. The new task tests use plain readiness objects and a mocked CodeIndexManagerRegistry.getOrCreate…
Title check	✅ Passed	The title clearly summarizes the primary change: aligning codebase search readiness across mode filters.
Description check	✅ Passed	The description explains the implementation, dependency on #1622, regression coverage, validation steps, limitations, and review scope. It does not reproduce the template headings or checklist, and it…

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Inline comments:
In `@src/core/prompts/tools/__tests__/codebase-search-readiness.spec.ts`:
- Line 26: Update the helper’s settings parameter in the readiness tests to
remove its default empty-object value, allowing omitted settings to remain
undefined and exercise optional-settings handling while preserving the existing
ready-manager cases.

In `@src/services/code-index/code-index-manager-registry.ts`:
- Line 10: Update getInstance and related registry lookups to accept a
vscode.WorkspaceFolder or string, pass the WorkspaceFolder from extension
activation, and use folder.uri.toString(true) as the cache key when available.
Retain the string workspace path as the fallback when no folder URI exists, and
apply the same URI-aware key handling to folder-selected lookups and
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src/core/prompts/tools/filter-tools-for-mode.ts

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🔇 Additional comments (10)

src/core/prompts/tools/filter-tools-for-mode.ts (1)

387-387: 🔒 Security & Privacy | 🛡️ Analyzed with Security Review

Keep codebase_search behind execution-time validation. The execution path passes disabledTools as false requirements to validateToolUse, which rejects disabled tools before dispatch. The complete dispatch-path evidence is not available in the supplied citation set.

src/eslint-suppressions.json (1)

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70-71: LGTM!

src/activate/registerCommands.ts (1)

13-13: LGTM!

Also applies to: 230-230

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94-94: LGTM!

Also applies to: 3311-3311

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3228-3228: LGTM!

src/core/webview/webviewMessageHandler.ts (1)

65-65: LGTM!

Also applies to: 3314-3314

src/extension.ts (1)

38-38: LGTM!

Also applies to: 204-204

src/core/task/__tests__/build-tools-readiness.integration.spec.ts (1)

1-74: LGTM!

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In `@src/core/prompts/tools/__tests__/codebase-search-readiness.spec.ts`:
- Line 21: Add direct unit coverage in validateToolUse.spec.ts for
isToolAllowedForMode("codebase_search", ...) using one mode that includes the
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