fix(signals): read injector graphs for inspect-signals without switching the panel by erkamyaman · Pull Request #296 · pangular-inspector/devtools

erkamyaman · 2026-10-11T03:52:32Z

What and why

pangular:inspect-signals with root or a route path broadcast select-signal-component, which replaced the page's selected signal target. The page then pushed that injector's graph, so the Signals page switched away from the component the user picked, even though the tool is read-only and works with actions turned off.

The tool now sends a one-off request instead: the server broadcasts peek-signal-graph with a requestId (and pageId when page is given). The page collects that injector's graph with the existing collector, leaves its selected target alone, and answers through signal-graph-peek-result. The server waits up to 1.5 seconds for a matching answer and never writes it into the shared signal-graph state. Page logic lives in signal-peek.ts, server bookkeeping in rpc/signal-peeks.ts; each overlay gets one wiring call. signal-graph-peek-result is listed under signals in RPC_INSPECTOR. The tool stays read-only, so it is not added to ACTION_TOOLS.

How it was verified

New agent tool test fails on main and passes here: the tool reads the Root graph, never sends select-signal-component, and the shared state still shows the component
New jsdom tests with a fake ng for the page-side handler and the server request tracker
pnpm test:devtools (1515 passed)
pnpm test:panel (242 passed)
pnpm typecheck
pnpm format:check
pnpm docs:build
pnpm commit:check

Screenshots

None attached.

Notes for reviewers

pangular:highlight still switches the Signals graph and the Components selection; that is its documented job and is unchanged.
A page running an older overlay never answers peek-signal-graph, so the tool times out after 1.5 seconds and lists the injectors the page knows.
Docs updated: agents/tools.md and inspectors/signals.md.

Summary by CodeRabbit

New Features
- Inspect signal graphs for the root or a route injector without changing the graph currently displayed in the Signals page. The peek returns the matching graph when available, or no graph when the injector cannot be found.
Documentation
- Updated guidance to explain that inspecting an injector reads its graph once and leaves the Signals page’s selected graph unchanged.

…ing the panel inspect-signals with `root` or a route path broadcast select-signal-component, which replaced the page's selected signal target. The page then pushed the injector graph as its graph, so the Signals page switched away from what the user picked, even though the tool is read-only. The tool now broadcasts peek-signal-graph with a requestId. The page collects the injector's graph once with the existing collector, leaves its selected target alone and answers through signal-graph-peek-result. The server waits up to 1.5 seconds for a matching answer, scoped to the requested page, and never writes the answer into the shared signal-graph state.

coderabbitai · 2026-10-11T03:52:55Z

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📥 Commits

Reviewing files that changed from the base of the PR and between 2897d96 and f3aa811.

📒 Files selected for processing (4)

packages/devtools/src/__tests__/agent-tools.test.ts
packages/devtools/src/__tests__/signal-peek.test.ts
packages/devtools/src/devframe.ts
packages/devtools/src/rpc/signal-peeks.ts

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📝 Walkthrough

Walkthrough

The change adds one-shot RPC peeks for environment injector graphs. Overlay sessions collect and return matching graphs without changing the Signals page’s selected graph. The inspect-signals tool and documentation describe this behavior.

Changes

Signal graph peek flow

Layer / File(s)	Summary
Validate peek requests and collect graphs `packages/devtools/src/signal-peek.ts`, `packages/devtools/src/overlay*.ts`, `packages/devtools/src/overlay-angular-native.ts`, `packages/devtools/src/overlay-nativescript.ts`, `packages/devtools/src/__tests__/signal-peek.test.ts`	The peek protocol validates requests, collects the requested injector graph and optional history, and returns a graph or null. Overlay sessions register responders. Tests cover matching and unmatched injectors, page targeting, malformed requests, and timeout behavior.
Coordinate requests and update inspect-signals `packages/devtools/src/rpc/signal-peeks.ts`, `packages/devtools/src/config.ts`, `packages/devtools/src/devframe.ts`, `packages/devtools/src/__tests__/agent-tools.test.ts`, `apps/docs/src/content/agents/tools.md`, `apps/docs/src/content/inspectors/signals.md`	The coordinator tracks peek requests and resolves them from valid responses or with null. Devframe routes result messages and uses peeks for environment-specific inspect-signals requests without changing the selected graph. Tests and documentation reflect the behavior.

Priority: ⬇️ Low

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

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Devframe
  participant SignalPeeks
  participant OverlayResponder
  participant SignalGraphCollector
  Devframe->>SignalPeeks: Request graph for environment
  SignalPeeks->>OverlayResponder: Broadcast peek request
  OverlayResponder->>SignalGraphCollector: Collect requested graph
  SignalGraphCollector-->>OverlayResponder: Return graph or no match
  OverlayResponder-->>SignalPeeks: Return peek result
  SignalPeeks-->>Devframe: Resolve with graph or null

Merge Risk: 🔵 Low · up to 2897d

Inspecting an injector without specifying a page can occasionally return the fallback graph instead of the matching graph. The issue is bounded, but the reply accounting should be fixed.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 2897d

The change preserves the selected Signals view without expanding demonstrated read access. A multi-page reply-accounting weakness can cause an inspection to fall back prematurely, but the demonstrated effect is limited to that request.

Retained concerns

Low · reliability · inferred: Unscoped peek completion counts messages rather than distinct expected pages. The request broadcasts without a page target but budgets replies using signalPages.size; the answer handler decrements that budget for any correlated null or invalid graph response without checking membership or prior replies. Extra or repeated responses can terminate the request before a matching page answers, causing fallback to the previously reported graph. Targeted page filtering and terminal cleanup limit the effect, but do not isolate each responder's contribution to unscoped completion.

Security review details

Security Blast Radius

inferred — The demonstrated exposure is signal graph data from pages connected to the same inspection server. Explicit page requests filter by page ID; unscoped requests broadcast across connected responders. The reply-accounting concern affects an individual inspection's completeness and fallback, without demonstrated durable selection corruption or increased privileges.

Trust Boundaries and Controls

observed — Correlation and explicit page-ID equality are routing controls, not demonstrated sender authentication. The new handler consumes pageId from the reply payload. The base push-signal-graph handler also accepted page-supplied identities and graph contents, so that trust assumption predates this PR; transport-level enforcement and whether connected pages are mutually trusted remain unestablished.

Resilience and Maintainability Implications

observed — The peek is not free of diagnostic-state mutation: optional history collection updates the existing per-page history cache. It uses bounded history storage and does not advance the normal graph-delivery cursor, whose advancement and rollback remain in collectDeltaWithRollback.

Hardening Proposals

proposed — Track the expected page identities for each peek and count at most one terminal response per expected page. Explicitly define how additional broadcast recipients are handled so one responder cannot exhaust another page's completion budget.

Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 63.64% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 9 files. (2 skipped: …	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: reading injector graphs without switching the Signals panel.
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.

Full details: Docstring Coverage

Explanation

Docstring coverage is 63.64% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 9 files. (2 skipped: 2 unsupported.)

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cloudflare-workers-and-pages · 2026-10-11T03:53:35Z

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Actionable comments posted: 1

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Inline comments:
Review comments at @packages/devtools/src/devframe.ts:
- Line 1886: Update the inspect-signals response accounting around `page ? 1 :
signalPages.size` so an unscoped broadcast is not counted by reported signal
pages; wait for the timeout after null replies or count replies only from the
intended page IDs, ensuring a null reply cannot trigger the fallback before a
known page’s matching graph arrives.

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📒 Files selected for processing (11)

apps/docs/src/content/agents/tools.md
apps/docs/src/content/inspectors/signals.md
packages/devtools/src/__tests__/agent-tools.test.ts
packages/devtools/src/__tests__/signal-peek.test.ts
packages/devtools/src/config.ts
packages/devtools/src/devframe.ts
packages/devtools/src/overlay-angular-native.ts
packages/devtools/src/overlay-nativescript.ts
packages/devtools/src/overlay.ts
packages/devtools/src/rpc/signal-peeks.ts
packages/devtools/src/signal-peek.ts

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An unscoped inspect-signals peek resolved with no graph once it had as many empty replies as there were signal pages, counting replies from any page. An overlay that never reported a signal graph could therefore end the wait before the page holding the graph answered, and the tool fell back to the reported graph. The tracker now takes the page ids it expects (the signal pages, or the requested page) and only counts an empty reply from one of them, once per page, toward the early resolve. A graph from any asked page still resolves the request.

…d-only

erkamyaman requested a review from santoshyadavdev as a code owner October 11, 2026 03:52

github-actions Bot added area: package The ng-devtools package (packages/ng-devtools) area: agents MCP server, agent tools and resources area: docs The documentation site labels Oct 11, 2026

coderabbitai Bot reviewed Oct 11, 2026

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Comment thread packages/devtools/src/devframe.ts Outdated

erkamyaman mentioned this pull request Oct 11, 2026

fix(mcp): mark page text as untrusted in every agent tool answer #302

Merged

7 tasks done

erkamyaman added 2 commits October 11, 2026 04:34

Merge remote-tracking branch 'upstream/main' into signals/inspect-rea…

79a80d6

…d-only

erkamyaman merged commit a0f3492 into main Oct 11, 2026
5 of 6 checks passed

erkamyaman deleted the signals/inspect-read-only branch October 11, 2026 04:43

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fix(signals): read injector graphs for inspect-signals without switching the panel - #296

fix(signals): read injector graphs for inspect-signals without switching the panel#296
erkamyaman merged 3 commits into
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signals/inspect-read-only

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