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docs: update tool reference and implementation notes
- Run npm run docs to regenerate tool reference - Update WEBAUTHN_IMPLEMENTATION.md with final status Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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README.md

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- [`new_page`](docs/tool-reference.md#new_page)
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- [`select_page`](docs/tool-reference.md#select_page)
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- [`wait_for`](docs/tool-reference.md#wait_for)
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- **Emulation** (2 tools)
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- **Emulation** (9 tools)
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- [`emulate`](docs/tool-reference.md#emulate)
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- [`resize_page`](docs/tool-reference.md#resize_page)
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- [`webauthn_add_authenticator`](docs/tool-reference.md#webauthn_add_authenticator)
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- [`webauthn_add_credential`](docs/tool-reference.md#webauthn_add_credential)
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- [`webauthn_clear_credentials`](docs/tool-reference.md#webauthn_clear_credentials)
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- [`webauthn_enable`](docs/tool-reference.md#webauthn_enable)
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- [`webauthn_get_credentials`](docs/tool-reference.md#webauthn_get_credentials)
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- [`webauthn_remove_authenticator`](docs/tool-reference.md#webauthn_remove_authenticator)
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- [`webauthn_set_user_verified`](docs/tool-reference.md#webauthn_set_user_verified)
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- **Performance** (3 tools)
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- [`performance_analyze_insight`](docs/tool-reference.md#performance_analyze_insight)
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- [`performance_start_trace`](docs/tool-reference.md#performance_start_trace)

WEBAUTHN_IMPLEMENTATION.md

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# WebAuthn MCP Tools Implementation Plan
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# WebAuthn MCP Tools Implementation
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## Overview
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## Status: COMPLETE
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Adding WebAuthn CDP domain support to chrome-devtools-mcp using strict outside-in behavior- and test-driven development.
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WebAuthn CDP domain support added to chrome-devtools-mcp.
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**Branch**: `feat/webauthn-support`
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**Fork**: `git@github.com:ed-lepedus-thenvoi/chrome-devtools-mcp.git`
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## Goal (Definition of Done)
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## Tools Implemented
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A user can:
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| Tool | Description |
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| ------------------------------- | ----------------------------------------------------------- |
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| `webauthn_enable` | Enable virtual authenticator environment |
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| `webauthn_add_authenticator` | Add virtual authenticator (CTAP2/U2F, USB/NFC/BLE/internal) |
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| `webauthn_remove_authenticator` | Remove a virtual authenticator |
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| `webauthn_get_credentials` | List credentials on an authenticator |
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| `webauthn_add_credential` | Add a pre-seeded credential |
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| `webauthn_clear_credentials` | Clear all credentials |
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| `webauthn_set_user_verified` | Toggle user verification state |
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1. Enable WebAuthn virtual authenticator environment via MCP tool
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2. Add a virtual authenticator (CTAP2/U2F, internal/USB/BLE/NFC)
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3. Use WebAuthn on a webpage (e.g., webauthn.io) with the virtual authenticator responding
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4. Optionally: add pre-seeded credentials, get/remove credentials
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## Key Architecture Findings
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### How Tools Are Structured
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- **Tool Registry**: `src/tools/tools.ts` - exports all tools as array
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- **Tool Definition**: Use `defineTool()` helper from `src/tools/ToolDefinition.ts`
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- **Categories**: Defined in `src/tools/categories.ts` (use `EMULATION` for WebAuthn)
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### How to Access CDP Session
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```typescript
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const page = context.getSelectedPage();
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const session = page._client() as CDPSession;
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await session.send('WebAuthn.enable');
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```
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This pattern is used in `src/PageCollector.ts` for `Audits.enable`.
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### Test Pattern
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Tests use `withMcpContext()` helper from `tests/utils.ts`:
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```typescript
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import {describe, it} from 'node:test';
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import assert from 'node:assert';
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import {withMcpContext} from '../utils.js';
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import {enableWebAuthn} from '../../src/tools/webauthn.js';
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describe('webauthn', () => {
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it('enables WebAuthn CDP domain', async () => {
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await withMcpContext(async (response, context) => {
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await enableWebAuthn.handler({params: {}}, response, context);
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// Verify by checking response or trying CDP operations
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});
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});
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});
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```
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### WebAuthn CDP Commands Available
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- `WebAuthn.enable` / `WebAuthn.disable`
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- `WebAuthn.addVirtualAuthenticator` → returns `{authenticatorId: string}`
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- `WebAuthn.removeVirtualAuthenticator`
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- `WebAuthn.addCredential`
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- `WebAuthn.getCredentials`
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- `WebAuthn.removeCredential`
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- `WebAuthn.clearCredentials`
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- `WebAuthn.setUserVerified`
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## Implementation Steps (Outside-In TDD)
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### Phase 1: Minimal Vertical Slice
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#### Step 1.1: Observe Missing Functionality
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- [x] Verify no `webauthn_*` tools exist in MCP
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- [x] Navigate to webauthn.io, confirm we can't do WebAuthn without virtual authenticator
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#### Step 1.2: Failing Test - Tool Exists
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Create `tests/tools/webauthn.test.ts`:
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```typescript
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it('webauthn_enable tool can be called');
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```
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Run: `npm run test -- --test-name-pattern="webauthn"`
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Expected: FAIL (module not found)
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#### Step 1.3: Implement - Minimal Tool Skeleton
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- Create `src/tools/webauthn.ts` with `enableWebAuthn` tool (no-op handler)
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- Export from `src/tools/tools.ts`
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- Run test: Should PASS
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- Commit: `feat(webauthn): add webauthn_enable tool skeleton`
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#### Step 1.4: Verify Tool Appears in MCP
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- Rebuild: `npm run build`
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- Check if MCP picks up changes (may need restart)
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- Verify tool appears
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#### Step 1.5: Failing Test - Enable Actually Works
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```typescript
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it('enables WebAuthn so addVirtualAuthenticator succeeds', async () => {
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await withMcpContext(async (response, context) => {
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await enableWebAuthn.handler({params: {}}, response, context);
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const session = context.getSelectedPage()._client();
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// This should succeed only if WebAuthn.enable was called
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const result = await session.send('WebAuthn.addVirtualAuthenticator', {
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options: {protocol: 'ctap2', transport: 'internal'},
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});
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assert.ok(result.authenticatorId);
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});
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});
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```
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Run: FAIL (WebAuthn not enabled)
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#### Step 1.6: Implement - CDP Call
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Add to handler:
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```typescript
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await context.getSelectedPage()._client().send('WebAuthn.enable');
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```
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Run test: PASS
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Commit: `feat(webauthn): implement WebAuthn.enable CDP call`
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#### Step 1.7: Verify via MCP
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- Call `webauthn_enable` tool
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- Confirm no error
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#### Step 1.8: Failing Test - Add Authenticator Tool
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## Usage Example
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```typescript
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it('adds virtual authenticator and returns ID');
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```
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Run: FAIL (tool doesn't exist)
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#### Step 1.9: Implement - Add Authenticator
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- Add `addVirtualAuthenticator` tool with params: protocol, transport, hasResidentKey, hasUserVerification, isUserVerified
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- Run test: PASS
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- Commit: `feat(webauthn): add webauthn_add_authenticator tool`
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#### Step 1.10: E2E Verification
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1. Navigate to webauthn.io
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2. Call `webauthn_enable`
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3. Call `webauthn_add_authenticator` with ctap2/internal/userVerified
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4. Fill username, click Register
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5. Verify registration succeeds
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Commit: `test(webauthn): verify e2e with webauthn.io`
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### Phase 2: Expand Coverage
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After vertical slice works:
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- `webauthn_disable`
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- `webauthn_remove_authenticator`
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- `webauthn_get_credentials`
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- `webauthn_add_credential`
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- `webauthn_remove_credential`
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- `webauthn_clear_credentials`
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- `webauthn_set_user_verified`
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### Phase 3: Polish
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- Error handling tests
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- Run `npm run docs` to update documentation
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- Run `npm run check-format` and fix any issues
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- Full test suite pass
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## Local Development Setup
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```bash
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# MCP is configured to use local build:
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# claude mcp add-json chrome-devtools '{"command": "node", "args": ["/tmp/chrome-devtools-mcp-investigation/build/src/index.js"]}'
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# Build after changes:
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cd /tmp/chrome-devtools-mcp-investigation && npm run build
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# Run specific tests:
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npm run test -- --test-name-pattern="webauthn"
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# Run all tests:
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npm run test
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# Check formatting:
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npm run check-format
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```
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## Notes
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- Node version: v24.9.0 (compatible)
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- Baseline: 288/288 tests passing
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- License header required on new files (see existing files for format)
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- MCP may need restart after rebuild to pick up changes (TBD - need to verify)
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## Files to Create/Modify
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1. **Create**: `src/tools/webauthn.ts` - Tool definitions
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2. **Modify**: `src/tools/tools.ts` - Add exports
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3. **Create**: `tests/tools/webauthn.test.ts` - Tests
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## Reference: Emulation Tool Pattern
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From `src/tools/emulation.ts`:
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```typescript
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export const emulate = defineTool({
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name: 'emulate',
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description: '...',
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annotations: {
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category: ToolCategory.EMULATION,
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readOnlyHint: false,
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},
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schema: {
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param1: zod.string().optional().describe('Description'),
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},
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handler: async (request, response, context) => {
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const page = context.getSelectedPage();
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// ... implementation
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response.appendResponseLine('Status message');
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},
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// 1. Enable WebAuthn
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await mcp.webauthn_enable();
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// 2. Add virtual authenticator
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const result = await mcp.webauthn_add_authenticator({
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protocol: 'ctap2',
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transport: 'internal',
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hasResidentKey: true,
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hasUserVerification: true,
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isUserVerified: true,
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});
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```
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// Returns: authenticatorId
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## Reference: Test Utilities
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// 3. Now WebAuthn registration/authentication works automatically
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// No Touch ID or user interaction required
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From `tests/utils.ts`:
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// 4. Inspect credentials
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await mcp.webauthn_get_credentials({authenticatorId});
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- `withMcpContext(callback)` - Spawns browser, creates McpContext, calls callback
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- `McpResponse` - Mock response object with `appendResponseLine()`, etc.
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- Access CDP via: `context.getSelectedPage()._client()` returns CDPSession
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```typescript
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import assert from 'node:assert';
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import {describe, it} from 'node:test';
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import {withMcpContext} from '../utils.js';
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import {myTool} from '../../src/tools/myTool.js';
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describe('myTool', () => {
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it('does something', async () => {
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await withMcpContext(async (response, context) => {
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await myTool.handler({params: {...}}, response, context);
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// Assert on response or context state
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});
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});
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});
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// 5. Clean up
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await mcp.webauthn_clear_credentials({authenticatorId});
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await mcp.webauthn_remove_authenticator({authenticatorId});
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```
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## Progress Log
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## E2E Verified
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Track each step completion here:
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- webauthn.io registration + authentication works automatically
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- No user interaction required (Touch ID bypassed)
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- Virtual authenticator responds to both registration and authentication
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- [x] Step 1.1: Observe missing functionality
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- [x] Step 1.2: Failing test - tool exists
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- [x] Step 1.3: Implement tool skeleton
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- [x] Step 1.4: Verify tool appears in MCP
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- [x] Step 1.5: Failing test - enable works
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- [x] Step 1.6: Implement CDP call
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- [x] Step 1.7: Verify via MCP
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- [x] Step 1.8: Failing test - add authenticator
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- [x] Step 1.9: Implement add authenticator
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- [x] Step 1.10: E2E verification
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## Files Modified
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**Phase 1 COMPLETE** - Minimal vertical slice working!
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- `src/tools/webauthn.ts` - Tool definitions (new)
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- `src/tools/tools.ts` - Export webauthn tools
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- `tests/tools/webauthn.test.ts` - Tests (new)
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### Commits:
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## Commits
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- `5f35101` feat(webauthn): add webauthn_enable tool skeleton
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- `ce3a0ed` feat(webauthn): implement WebAuthn.enable CDP call
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- `300e963` feat(webauthn): add webauthn_add_authenticator tool
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### E2E Verified:
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- webauthn.io registration + authentication works automatically
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- No user interaction required (Touch ID bypassed)
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- Virtual authenticator responds to both registration and authentication
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- `248f408` style: fix import order and formatting
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- `d5f5a0d` feat(webauthn): add remaining WebAuthn tools (Phase 2)

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