feat(mcp): let inspect-providers select environment injectors

[erkamyaman]

What and why

inspect-providers only matched element injectors with selector, so asking what Root, Platform or a route injector such as Route: admin provides returned "No element injector matches". The only fallback was the whole tree, cut off at 20,000 characters.

A selector now also matches environment injectors by name (case-insensitive, extra whitespace ignored) or by id. The answer lists:

• that injector's providers
• what the services it already created inject, naming the injector that supplied each one
• its parent environment injectors and the tokens each provides

Element selectors behave as before. When nothing matches, the answer names both kinds of injector and lists the environment injectors on the page, so an agent can retry with a valid name. With token, injections are narrowed to the matched element or environment injectors.

The tool description in devframe.ts and the agent tools docs page are updated.

How it was verified

• pnpm commit:check: 1 commit message OK
• pnpm format:check: all files pass Prettier
• pnpm typecheck: exit 0 (only existing NG8107 warnings in app)
• pnpm test:devtools: the new test and the existing selector, token and size-limit tests in agent-tools.test.ts pass. The full run passed 1420 of 1426 tests. The 6 failures were 5-second timeouts in analog-inspector, cli-bin, page-highlight and store-inspector, on a heavily loaded machine. Those files pass (24/24) with --testTimeout=60000.
• pnpm test:panel: not run, app/ unchanged
• Docs updated (apps/docs/src/content/agents/tools.md) and pnpm docs:build passes
• pnpm extension:build: not needed, app/ unchanged
• Browser axe check: not needed, no UI change

Notes for reviewers

• Environment injectors are matched by exact name, not substring, so admin does not match Route: admin. The no-match message lists the full names to retry with.
• If a selector matches both an element injector and an environment injector, both sections are returned, element injectors first.
• Parent injectors are worked out from how the reported environment tree is nested; no new page-side data is collected.

Summary by CodeRabbit

• New Features
  • Provider inspection can find environment injectors by exact ID or by name, ignoring differences in capitalization and whitespace.
  • Environment injector results include providers, dependencies of created services, and parent lookup paths. Element injector results include resolved lookup paths.
  • Environment injectors can be inspected on pages without element roots. Token filtering works for matched environment injectors, and unmatched selectors list available element tags and environment injector names.
• Documentation
  • Updated provider inspection guidance to explain selector matching for element and environment injectors, including environment injector name examples.

[coderabbitai]

📝 Walkthrough

Walkthrough

The inspect-providers tool now accepts environment injector IDs and normalized names as selectors. It reports environment injector providers, dependencies, and parent chains. Element injector results remain available, and unmatched selectors list available names.

Changes

Provider inspection

Layer / File(s)	Summary
Environment injector matching and results packages/devtools/src/rpc/injector-tools.ts, packages/devtools/src/devframe.ts	The tool matches environment injector IDs or normalized names. Results include provider details and parent chains. The selector descriptions include environment injector names.
Selector coverage and documentation packages/devtools/src/__tests__/agent-tools.test.ts, apps/docs/src/content/agents/tools.md, apps/docs/src/content/inspectors/injectors.md	Tests cover environment injector selection, provider details, parent chains, scoped token lookup, element results, and unmatched selectors. Documentation describes selector values and results for matching element or environment injectors.

Priority: ⬇️ Low

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

Change: Feature

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Merge Risk: ⚪ Minimal · up to d0e66

Users can find injector ID selection in the agent-tools guide and tool description; no established issue remains that should delay merging.

Architecture Summary

Architecture risk: 🔵 Low · up to d0e66

The change affects 2 systems.

Changed systems: packages/devtools, apps/docs

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — packages/devtools (library) was modified; 3 changed files map to changed impact.
• observed — apps/docs (service) was modified; 2 changed files map to changed impact.

Before / after behavior

• observed — Modified behavior in apps/docs/src/content/agents/tools.md: The inspect-providers argument table now documents environment injector names as valid selector values, replacing the element-only matching description. It also specifies the distinct results for matching element versus environment injectors and the available-name guidance when no selector matches.
• observed — Modified behavior in packages/devtools/src/devframe.ts: Expanded the tool description to cover environment-injector selection and details, element-injector lookup paths, no-match output, and partial-tree reporting.
• observed — Modified behavior in packages/devtools/src/devframe.ts: The selector description now includes environment injector names, case-insensitive, in addition to tags, class names, and injector IDs.
• observed — Modified behavior in packages/devtools/src/tests/agent-tools.test.ts: The unmatched-selector expectation now accepts the error wording for either element or environment injectors, rather than only element injectors.

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Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 3 files. (1 skipped: 1…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: enabling inspect-providers to select environment injectors.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Full details: Docstring Coverage

Explanation

Docstring coverage is 66.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 3 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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Inline comments:
Review comments at @packages/devtools/src/rpc/injector-tools.ts:
- Line 78: Update the early `NO_INJECTORS` guard to check both `page.roots` and
`page.environment`, returning only when neither tree contains injectors.
Preserve the existing environment selector and token-search paths so
environment-only reports remain inspectable.

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📒 Files selected for processing (4)

• apps/docs/src/content/agents/tools.md
• packages/devtools/src/__tests__/agent-tools.test.ts
• packages/devtools/src/devframe.ts
• packages/devtools/src/rpc/injector-tools.ts

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[coderabbitai]

🔇 Additional comments (1)

apps/docs/src/content/inspectors/injectors.md-117-117 (1)

117-117: 📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

⚠️ Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.

Document environment injector ID selectors.

The selector also accepts an exact environment injector ID, but this row lists only name examples. Add an ID example so users can discover this supported selector form.

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• Configuration used: defaults
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• apps/docs/src/content/inspectors/injectors.md

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