feat(mcp): add page tools, shipped agent skills and more agent actions by erkamyaman · Pull Request #398 · pangular-inspector/devtools

erkamyaman · 2026-10-13T06:56:03Z

Refs #343. This is the Agents section of phase 4.

Page tools for browser agents (WebMCP)

When agent.browserTools is on, the overlay registers the read agent tools on the page:
- through WebMCP (document.modelContext.registerTool, or navigator.modelContext on earlier drafts);
- and by answering the devtoolstooldiscovery event, under the group Pangular Inspector.
Each call goes back to the server, which runs the same handler, config checks and redaction an MCP call gets. Action and destructive tools never reach the page. The tools are unregistered on leave and stop.
Off by default. Any script on the development page could call these tools, and they read the server's view of the app. Turn them on with agent: { browserTools: true }. The default is open for discussion in agents: decide whether page tools (agent.browserTools) are on by default #396.
The Forms tab leaves these tools out of its WebMCP list.

Agent skills in the package

Four user-facing skills ship in packages/devtools/skills:
- pangular-inspector: the inspect, fix, verify loop and a question-to-tool table;
- pangular-forms;
- pangular-errors;
- pangular-performance.
pangular skills install copies them into .claude/skills by default.
- --agent agents|github picks another agent folder; --dir and --global pick another location.
- --skill installs only the named skills.
- It never overwrites a changed skill without --force, and --dry-run writes nothing.
- pangular skills lists them.
skills:check now validates them too.

More agent actions

Tool	Tier	What it does
`inspect-transfer-state`	read	Reads the TransferState entries of a page
`list-ssr-overrides`	read	Lists the SSR overrides
`set-ssr-override`	action	Adds or changes a render error, forced client render or state edit
`remove-ssr-override`	action	Removes one
`screenshot-component`	read	Returns one component as an image
`list-console`	read	Now takes `since`

Override tools: they use the same checks and save path as the panel, so the panel list updates live. agent.readOnly and actions.http: false drop them.
Screenshots:
- How they're made: the page copies the component's subtree into an inert document with its computed styles and draws it on a detached canvas. The app's DOM is never written, and it also works for elements scrolled out of view.
- Masking: password and secret-named fields are masked, along with data-private and .sentry-mask/.rr-mask elements and JWTs and bearer tokens in text.
- Limits, documented: images from other origins without CORS, iframes and some web fonts don't draw.
- Loading: the code loads on the first request.
Console: the Errors collector now pauses its pushes while nobody watches and keeps capturing into its buffer.
Image results over MCP: devframe's MCP adapter always sends one text block. The existing @devframes/agentic patch now also passes a tool's image block through. Like the existing patch, this only applies inside this repo. Apps that install the package get the markdown answer until devframe supports image content.

Docs

New agents/browser-agents.md and agents/skills.md.
getting-started/cli.md and getting-started/configuration.md.
agents/tools.md (Eighty tools) and agents/mcp-server.md (seventeen tools act on the app).
inspectors/components.md, inspectors/errors.md, inspectors/ssr-http.md and security.md.

Checks

Check	Result
`pnpm format:check`	Passes
`pnpm typecheck`	Passes
`pnpm test:devtools`	2796 passed, 3 skipped
`pnpm test:panel`	671 passed, 1 skipped
`pnpm docs:build`	Passes
`pnpm skills:check`	Passes
`pnpm commit:check`	Passes
`pnpm extension:build`	Done, in its own commit

Browser checks:

Page tools: with a WebMCP-shaped document.modelContext, 60 read tools registered and returned real data. pagehide unregistered them and pageshow registered them again.
Screenshot: it matched a real element screenshot closely, with the masks applied.
Override tools: on the demo app, a state-edit and a render-error took effect, and removing them restored a 200.

Not covered

Native WebMCP in a shipping Chrome wasn't available to test against; this follows the W3C draft and chrome-devtools-mcp 1.10.1.
.agents/skills and .github/skills follow current conventions as far as known.
The panel's Settings view doesn't show agent.browserTools yet.

Summary by CodeRabbit

New Features
- Added opt-in browser-agent access to read-only inspection tools and component screenshots, with sensitive content masked in images.
- Added four bundled agent skills, with CLI options to list, install, preview, and replace them.
- Added tools to inspect TransferState data and manage SSR overrides, plus time-based filtering for console logs.
Documentation
- Expanded guidance on browser agents, agent skills, tools, configuration, and data privacy.
Bug Fixes
- Improved delivery of captured errors and console activity when a page becomes active, including activity captured while it was idle.

Browser agents can find the read-only tools on the page through WebMCP when agent.browserTools is on (off by default). The package ships agent skills with a pangular skills install command, and agents gain TransferState and SSR override tools, a component screenshot tool and a since filter on list-console. Refs #343.

Rebuilt from the panel on this branch.

coderabbitai · 2026-10-13T06:56:34Z

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apps/docs/src/content/agents/browser-agents.md
apps/docs/src/content/agents/mcp-server.md
apps/docs/src/content/agents/tools.md
apps/docs/src/content/getting-started/configuration.md
apps/docs/src/ngmd.config.ts
extension/ui/assets/browser-agent-rpc-BXhoSh1z-85BPnAAT.js
extension/ui/index.html
packages/devtools/src/__tests__/config.test.ts
packages/devtools/src/__tests__/docs-tool-count.test.ts
packages/devtools/src/config.ts
packages/devtools/src/devframe.ts
packages/devtools/src/overlay.ts
packages/devtools/src/rpc/errors-register.ts

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📝 Walkthrough

This pull request adds browser-agent read tools, component screenshot capture, SSR override and TransferState tools, and bundled agent skills with a CLI installer. It also changes error delivery while pages are unwatched and adds a time filter to console queries.

Changes: Browser-agent tools and component screenshots

Layer / File(s)	Summary
Browser-tool listing and invocation `packages/devtools/src/rpc/browser-tools.ts`, `packages/devtools/src/config.ts`, `packages/devtools/src/rpc/__tests__/browser-tools.test.ts`, `apps/docs/src/content/agents/browser-agents.md`, `apps/docs/src/content/agents/tools.md`	The RPC layer exposes eligible read-tier tools to browser agents, scopes calls to owned pages, and redacts and limits answers. Configuration and documentation describe the opt-in setting and tool availability.
Page registration and lifecycle `packages/devtools/src/browser-tools.ts`, `packages/devtools/src/forms-webmcp.ts`, `packages/devtools/src/overlay.ts`, `packages/devtools/src/devframe.ts`, `packages/devtools/src/__tests__/browser-tools.test.ts`	The overlay registers tools through WebMCP or Chrome DevTools discovery and manages registration during page lifecycle changes.
Component screenshot capture and MCP image output `packages/devtools/src/component-screenshot.ts`, `packages/devtools/src/rpc/component-screenshots.ts`, `packages/devtools/src/devframe.ts`, `packages/devtools/src/overlay.ts`, `packages/devtools/src/__tests__/component-screenshot*.test.ts`, `patches/@devframes__agentic@1.2.3.patch`, `apps/docs/src/content/security.md`	The page creates masked component images, and the RPC tool returns validated screenshot results as MCP image content.

SSR overrides and TransferState tools

Layer / File(s)	Summary
Override operations and TransferState inspection `packages/devtools/src/rpc/ssr-override-tools.ts`, `packages/devtools/src/devframe.ts`, `packages/devtools/src/config.ts`, `packages/devtools/src/__tests__/ssr-override-tools.test.ts`	The tools validate and save SSR overrides and provide filtered TransferState reports. Override writes use the `actions.http` setting.
SSR tool documentation and output labels `apps/docs/src/content/agents/tools.md`, `apps/docs/src/content/agents/mcp-server.md`, `apps/docs/src/content/inspectors/ssr-http.md`, `packages/devtools/src/rpc/ssr-tools.ts`, `packages/devtools/src/__tests__/ssr-overrides.test.ts`	The documentation lists the SSR override and TransferState tools. The SSR request explanation uses the “SSR overrides” heading.

Bundled skills and installer

Layer / File(s)	Summary
Skill guides and package contents `packages/devtools/skills/*/SKILL.md`, `packages/devtools/package.json`, `apps/docs/src/content/agents/skills.md`, `apps/docs/src/ngmd.config.ts`	The package adds four skill guides and includes them in published files. The agent documentation describes the skills and installation options.
Skill discovery, installation, and CLI `packages/devtools/src/skills-install.ts`, `packages/devtools/src/cli.ts`, `packages/devtools/src/__tests__/skills-install.test.ts`, `scripts/validate-skills.mjs`, `apps/docs/src/content/getting-started/cli.md`, `AGENTS.md`	The CLI lists or installs bundled skills, with destination selection, dry-run, and force options. The validator scans package-shipped skills.

Error and console reporting

Layer / File(s)	Summary
Error reporting and watch leases `packages/devtools/src/errors-collector.ts`, `packages/devtools/src/rpc/page-interest.ts`, `packages/devtools/src/overlay.ts`, `packages/devtools/src/__tests__/console-log-lease.test.ts`, `packages/devtools/src/__tests__/page-interest.test.ts`, `apps/docs/src/content/inspectors/errors.md`	Errors count as watched state. While inactive, the collector sends keepalives; it sends captured changes when the page wakes.
Console time filter `packages/devtools/src/rpc/errors-tools.ts`, `packages/devtools/src/rpc/errors-register.ts`, `packages/devtools/src/__tests__/errors-tools.test.ts`, `apps/docs/src/content/agents/tools.md`	The console-list tool accepts duration, epoch-millisecond, and date filters, and reports invalid or empty results.

Priority: ➖ Normal

Estimated code review effort: 4 (Complex) | ~55 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant BrowserAgent
  participant BrowserToolRPC
  participant AgentTool
  BrowserAgent->>BrowserToolRPC: List eligible read tools
  BrowserAgent->>BrowserToolRPC: Call tool with page ID and arguments
  BrowserToolRPC->>AgentTool: Invoke with page-scoped arguments
  AgentTool->>BrowserToolRPC: Return tool result
  BrowserToolRPC->>BrowserAgent: Return redacted text

sequenceDiagram
  participant AgentClient
  participant ScreenshotTool
  participant Overlay
  participant Page
  AgentClient->>ScreenshotTool: Request target screenshot
  ScreenshotTool->>Overlay: Broadcast page-scoped request
  Overlay->>Page: Capture and mask target
  Page->>ScreenshotTool: Return screenshot result
  ScreenshotTool->>AgentClient: Return markdown and image content

sequenceDiagram
  participant AgentClient
  participant SsrOverrideTool
  participant Devframe
  participant SsrRegistry
  AgentClient->>SsrOverrideTool: Submit override change
  SsrOverrideTool->>Devframe: Save validated override list
  Devframe->>SsrRegistry: Update live registry
  SsrOverrideTool->>AgentClient: Return operation result

Merge Risk: 🔵 Low · up to ab7ed

Clarify which tools run on the page and which remain server-only. This documentation issue does not block merging.

Security architecture risk: 🟡 Moderate · up to ab7ed

The optional browser integration treats some server-wide runtime diagnostics as source-only reads, allowing page scripts to receive information beyond their own page. Being disabled by default, read-only filtering and secret masking limit exposure, but do not enforce page isolation. Screenshot teardown and ownership-recovery behavior also remain incompletely established.

Retained concerns

Medium · security · inferred: The source-read exception admits Analog tools whose handlers consume shared runtime state without caller-page filtering. With browser tools and the relevant inspector enabled, a script on one connected page can receive server-function activity and last-request diagnostics beyond that page. Read-only classification and token masking do not enforce the stated page boundary. The aggregation predates the PR; publishing these handlers through the page-tool interface is new.

Security review details

Security Blast Radius

inferred — The aggregate-read concern is bounded to the shared development server and workspace where browser tools and Analog tools are enabled. A script executing on one connected page can use its legitimate connection; another page's ownership need not be forged. The inspected outputs expose runtime metadata, not demonstrated credentials, arbitrary filesystem access or production infrastructure authority.

Security Findings and Attack Paths

inferred — A page script obtains an executable tool through discovery, calls an allowlisted Analog reader, and receives text derived from aggregate page or request state. Caller-page context is established, but these handlers do not use it. Secret masking does not remove ordinary call counts, rendering status or live-route presence.

Trust Boundaries and Controls

observed — The browser interface is disabled by default, admits only registered read tools, checks page ownership, replaces page arguments and redacts answers. Live ownership by another connection is rejected. Ownership also deliberately permits recovery after disconnection or expiry, so this policy is not an immutable page identity binding.

Resilience and Maintainability Implications

inferred — Prompt screenshot revocation on page teardown is not established. Leave sends forget operations, but pending requests survive until settlement or timeout, capture work is not cancelled, and result authorization calls owners.write, which can recreate ownership after release. Page matching and correlation prevent simple mismatched-page settlement, but do not establish lifecycle-generation isolation.

Hardening Proposals

proposed — Separate source-only handlers from aggregate runtime readers in browser eligibility. Exclude aggregate variants or supply page-filtered state before rendering their answers.
proposed — Bind screenshot requests to an ownership generation, use a non-mutating result authorization check, and cancel pending requests and page work on teardown. Verify interruption and concurrent recovery without assuming that forgetting a page alone rejects late results.

Pre-merge checks · 4 · 1

Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 110 functions across 38 files. (6 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 accurately summarizes the main changes: page-scoped browser tools, bundled agent skills, and additional agent actions.
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 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 110 functions across 38 files. (6 skipped: 6 unsupported.)

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Actionable comments posted: 5

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Inline comments:
Review comments at @apps/docs/src/content/getting-started/configuration.md:
- Line 135: Update the `agent.readOnly` and `actions.http` rows in the
configuration documentation to include `set-ssr-override` and
`remove-ssr-override` among the agent tools each option drops, matching their
behavior in `AGENT_SAFETY` and `ACTION_TOOLS.http`.

Review comments at @apps/docs/src/content/inspectors/components.md:
- Line 458: Update the description for the `pangular:hydration` table entry to
replace the incomplete action note with a complete sentence stating that turning
the outline on or off is an action.

Review comments at @packages/devtools/skills/pangular-inspector/SKILL.md:
- Line 46: Update the action guidance in the pangular-inspector skill to remove
the claim that a reload undoes actions. Require user approval before actions
such as form-action or dispatch-ngrx-action that can commit application data,
consistent with the approval guidance in the pangular-forms skill.

Review comments at @packages/devtools/src/rpc/errors-tools.ts:
- Line 419: Update the timestamp parsing logic around the numeric-string branch
to reject values outside the valid JavaScript Date range before returning them.
Apply the same range validation to numeric inputs and computed durations so
downstream calls to toISOString() never receive an invalid Date.

Review comments at @packages/devtools/src/skills-install.ts:
- Around line 150-151: Before the mkdirSync and copyFileSync calls in the skills
install flow, reject symbolic links in the destination file and every existing
directory component, then verify the resolved write path remains inside the
selected destination before writing. Keep forced installs from following
destination links to overwrite files outside that destination.

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extension/ui/assets/index-BfEJpf3j.js is excluded by !**/assets/index-[0-9a-z_-][0-9a-z_-][0-9a-z_-][0-9a-z_-][0-9a-z_-][0-9a-z_-][0-9a-z_-][0-9a-z_-].js
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📒 Files selected for processing (51)

AGENTS.md
apps/docs/src/content/agents/browser-agents.md
apps/docs/src/content/agents/mcp-server.md
apps/docs/src/content/agents/skills.md
apps/docs/src/content/agents/tools.md
apps/docs/src/content/getting-started/cli.md
apps/docs/src/content/getting-started/configuration.md
apps/docs/src/content/inspectors/components.md
apps/docs/src/content/inspectors/errors.md
apps/docs/src/content/inspectors/ssr-http.md
apps/docs/src/content/security.md
apps/docs/src/ngmd.config.ts
extension/ui/assets/browser-agent-rpc-BXhoSh1z-CG7sCnV0.js
extension/ui/index.html
packages/devtools/package.json
packages/devtools/skills/pangular-errors/SKILL.md
packages/devtools/skills/pangular-forms/SKILL.md
packages/devtools/skills/pangular-inspector/SKILL.md
packages/devtools/skills/pangular-performance/SKILL.md
packages/devtools/src/__tests__/browser-tools.test.ts
packages/devtools/src/__tests__/component-screenshot-tool.test.ts
packages/devtools/src/__tests__/component-screenshot.test.ts
packages/devtools/src/__tests__/config.test.ts
packages/devtools/src/__tests__/console-log-lease.test.ts
packages/devtools/src/__tests__/docs-tool-count.test.ts
packages/devtools/src/__tests__/errors-tools.test.ts
packages/devtools/src/__tests__/page-interest.test.ts
packages/devtools/src/__tests__/skills-install.test.ts
packages/devtools/src/__tests__/ssr-override-tools.test.ts
packages/devtools/src/__tests__/ssr-overrides.test.ts
packages/devtools/src/browser-tools.ts
packages/devtools/src/cli.ts
packages/devtools/src/component-screenshot.ts
packages/devtools/src/config.ts
packages/devtools/src/devframe.ts
packages/devtools/src/errors-collector.ts
packages/devtools/src/forms-privacy.ts
packages/devtools/src/forms-webmcp.ts
packages/devtools/src/overlay.ts
packages/devtools/src/page-lease.ts
packages/devtools/src/rpc/__tests__/browser-tools.test.ts
packages/devtools/src/rpc/browser-tools.ts
packages/devtools/src/rpc/component-screenshots.ts
packages/devtools/src/rpc/errors-register.ts
packages/devtools/src/rpc/errors-tools.ts
packages/devtools/src/rpc/page-interest.ts
packages/devtools/src/rpc/ssr-override-tools.ts
packages/devtools/src/rpc/ssr-tools.ts
packages/devtools/src/skills-install.ts
patches/@devframes__agentic@1.2.3.patch
scripts/validate-skills.mjs

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…t fields Page tools now always answer for the page that registered them, list only page-scoped tools and source scans, and leave other tabs out of their answers. Screenshots mask fields and custom controls by every name attribute. Skills install refuses symbolic links, `since` rejects out of range times, and the docs match the tool lists.

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Inline comments:
Review comments at @apps/docs/src/content/agents/browser-agents.md:
- Line 27: Revise the tool description so it clearly distinguishes
page-registered tools from tools that stay with the MCP server. In the paragraph
before the server-only tools list, replace the ambiguous “These” reference with
separate statements identifying the one-page tools and their `page` or `pageId`
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apps/docs/src/content/agents/browser-agents.md
apps/docs/src/content/agents/tools.md
apps/docs/src/content/getting-started/configuration.md
apps/docs/src/content/inspectors/components.md
apps/docs/src/content/security.md
packages/devtools/skills/pangular-inspector/SKILL.md
packages/devtools/src/__tests__/component-screenshot.test.ts
packages/devtools/src/__tests__/errors-tools.test.ts
packages/devtools/src/__tests__/skills-install.test.ts
packages/devtools/src/component-screenshot.ts
packages/devtools/src/rpc/__tests__/browser-tools.test.ts
packages/devtools/src/rpc/browser-tools.ts
packages/devtools/src/rpc/component-outline.ts
packages/devtools/src/rpc/errors-tools.ts
packages/devtools/src/rpc/page-scope.ts
packages/devtools/src/rpc/pages.ts
packages/devtools/src/rpc/pipes-agent.ts
packages/devtools/src/rpc/router-tools.ts
packages/devtools/src/skills-install.ts

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apps/docs/src/content/inspectors/components.md
apps/docs/src/content/security.md
packages/devtools/src/tests/errors-tools.test.ts
apps/docs/src/content/getting-started/configuration.md
packages/devtools/src/tests/skills-install.test.ts
packages/devtools/src/skills-install.ts

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# Conflicts: # apps/docs/src/content/agents/tools.md # extension/ui/assets/browser-agent-rpc-BXhoSh1z-B_f3HV4w.js # extension/ui/assets/browser-agent-rpc-BXhoSh1z-CG7sCnV0.js # extension/ui/assets/browser-agent-rpc-BXhoSh1z-Cq6OpQlN.js # extension/ui/assets/index-BfEJpf3j.js # extension/ui/assets/index-CyKw4x-n.js # extension/ui/assets/index-DJ-lPKba.js # extension/ui/index.html # packages/devtools/src/__tests__/docs-tool-count.test.ts # packages/devtools/src/devframe.ts # packages/devtools/src/overlay.ts

Splits the sentence before the list of tools that stay with the MCP server, so it is clear which tools the page registers.

erkamyaman added 2 commits October 13, 2026 06:55

build(extension): rebuild the panel bundle

62eec10

Rebuilt from the panel on this branch.

erkamyaman requested a review from santoshyadavdev as a code owner October 13, 2026 06:56

github-actions Bot added area: package The ng-devtools package (packages/ng-devtools) area: extension The Chrome extension area: agents MCP server, agent tools and resources area: docs The documentation site area: ci Workflows, hooks and repository tooling labels Oct 13, 2026

coderabbitai Bot reviewed Oct 13, 2026

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Comment thread apps/docs/src/content/agents/browser-agents.md Outdated

erkamyaman added 2 commits October 13, 2026 07:47

docs(mcp): say which read tools the page registers

44de785

Splits the sentence before the list of tools that stay with the MCP server, so it is clear which tools the page registers.

erkamyaman merged commit 87c8ae4 into main Oct 13, 2026
6 of 8 checks passed

erkamyaman deleted the feat/phase4-agents branch October 13, 2026 07:56

This was referenced Oct 13, 2026

docs: list what phase 4 shipped on the roadmap #401

Merged

phase 4 of 4: deeper diagnosis #343

Closed

feat(ui): add a Browser agents switch to Settings #406

Merged

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feat(mcp): add page tools, shipped agent skills and more agent actions - #398

feat(mcp): add page tools, shipped agent skills and more agent actions#398
erkamyaman merged 5 commits into
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feat/phase4-agents

erkamyaman commented Oct 13, 2026 •

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erkamyaman commented Oct 13, 2026 • edited by coderabbitai Bot Loading Uh oh! There was an error while loading. Please reload this page.

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Page tools for browser agents (WebMCP)

Agent skills in the package

More agent actions

Docs

Checks

Not covered

Summary by CodeRabbit

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erkamyaman commented Oct 13, 2026 •

edited by coderabbitai Bot

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