Expose documentation pages as MCP resources instead of tool

[Copilot]

• Understand the concern: Does importing from .js prevent type checking?
• Verify that TypeScript can find type definitions when importing from .js
• Create a test demonstrating type safety is maintained
• Document or add comments explaining how TypeScript type checking works with .js imports
• Verify the current code passes type checking
• Remove out-of-scope documentation file
• Fix URL-encoded path handling in resource reads
• Fix double slash issue causing "Page not found" errors
• Add test coverage for URL-encoded path handling

Summary

Added a test case that specifically covers the URL-encoded path decoding fix from commit 778d75b. The test verifies:

1. URL-encoded paths are decoded: Path like %2Fapi%2Fhooks%2Fuse-frame is properly decoded to /api/hooks/use-frame
2. No double-slash bug: When decoded path already has a leading slash, the code doesn't add another one (avoiding //api/hooks/use-frame)
3. Correct page matching: The properly formatted path successfully finds the matching page in the XML

Test Details:

it('should decode URL-encoded paths correctly', async () => {
  const urlEncodedPath = '%2Fapi%2Fhooks%2Fuse-frame'
  const decodedPath = decodeURIComponent(urlEncodedPath)
  const searchPath = decodedPath.startsWith('/') ? decodedPath : `/${decodedPath}`
  
  expect(searchPath).toBe('/api/hooks/use-frame') // NOT //api/hooks/use-frame
  // ... verify page is found
})

All tests pass (29 passed | 1 skipped).

Original prompt

On route.ts, dans https://github.com/pmndrs/docs/blob/main/src/app/api/%5Btransport%5D/route.ts plutot qu'un tool, je voudrais exposer chaque page comme une ressource

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[abernier]

@copilot oos, remove

[Copilot]

Removed in commit 9843325

[abernier]

@copilot when testing:

I get "Error
MCP error -32603: MCP server error: Page not found: /%2Fauthoring%2Fintro"

[Copilot]

@copilot when testing:

...

Fixed in commit fb6b097. The issue was that the MCP SDK passes URL-encoded paths in the URI template variables. When accessing docs://docs/authoring/intro, the path variable contained authoring%2Fintro (with / encoded as %2F), but the XML contains /authoring/intro (not encoded).

The fix decodes the path before matching:

const pathString = Array.isArray(path) ? path[0] : path
const decodedPath = decodeURIComponent(pathString)
const searchPath = `/${decodedPath}`

This should now correctly resolve pages like /authoring/intro.

[abernier]

@copilot still same error: "Error
MCP error -32603: MCP server error: Page not found: /%2Fauthoring%2Fintro"

[Copilot]

@copilot still same error: "Error
MCP error -32603: MCP server error: Page not found: /%2Fauthoring%2Fintro"

I've added debug logging in commit 01a5f53 to help diagnose the issue. Could you:

1. Restart your Next.js dev server to get the latest code
2. Try reading a resource again (like /authoring/intro)
3. Check the server console logs for lines starting with [MCP Resource Read]
4. Share what those logs show?

The logs will reveal exactly what path value is being received and how it's being processed, which will help identify if there's double-encoding or another issue happening.

[abernier]

@copilot still same error: "Error
MCP error -32603: MCP server error: Page not found: /%2Fauthoring%2Fintro"

I've added debug logging in commit 01a5f53 to help diagnose the issue. Could you:

1. Restart your Next.js dev server to get the latest code
2. Try reading a resource again (like /authoring/intro)
3. Check the server console logs for lines starting with [MCP Resource Read]
4. Share what those logs show?

The logs will reveal exactly what path value is being received and how it's being processed, which will help identify if there's double-encoding or another issue happening.

[MCP Resource Read] Raw path from variables: %2Fauthoring%2Fintro
[MCP Resource Read] URI: docs://docs/%2Fauthoring%2Fintro
[MCP Resource Read] Path string: %2Fauthoring%2Fintro
[MCP Resource Read] Decoded path: /authoring/intro
[MCP Resource Read] Search path: //authoring/intro

@copilot

[Copilot]

@copilot still same error: "Error
MCP error -32603: MCP server error: Page not found: /%2Fauthoring%2Fintro"

...

Fixed in commit 778d75b! The debug logs showed the issue perfectly - the decoded path /authoring/intro already had a leading slash, but the code was adding another one, creating //authoring/intro.

Changed the logic to only add a slash if the decoded path doesn't already have one:

const searchPath = decodedPath.startsWith('/') ? decodedPath : `/${decodedPath}`

The resource reads should now work correctly. You can restart the server and test again.

[abernier]

@copilot why i get each individual page listed in my resources, in the sMe list as indexes (which this is expected)

[Copilot]

@copilot why i get each individual page listed in my resources, in the sMe list as indexes (which this is expected)

This is the expected behavior for MCP resource templates. The code registers two types of resources:

1. Index resources (left panel): Static resources like docs://docs/index that list all available pages for a library
2. Page templates (middle panel): Templates like docs://docs/{path} that provide access to individual pages

The template's list callback returns all matching pages so MCP clients can discover what resources are available. This allows:

• Listing all docs pages via the template
• Accessing individual pages like docs://docs/authoring/intro

If you want to hide the individual page listings and only show the indexes, you would need to return an empty list from the template's list callback. However, this would make resource discovery harder for MCP clients.

[abernier]

@copilot au lieu de se baser sur /llms-full.txt je voudrais exploiter le fait que les differents repos des libs sont sur github dans un repertoire docs/ la plupart du temps). ce repository est indiqués dans libs.

donc on doit pouvoir a partir de là, extraire les differentes pages sous docs/ et convertir l'url raw github en uri, juste en enlevant https://github.com/pmndrs/:libname/tree/main/docs/getting-started/introduction.mdx en docs://pmndrs/:libname/getting-started/introduction.mdx et servir le fichier raw tel quel

on peut d'ailleurs pour ca peut etre utiliser un sdk/api github ? ou bien fetch ?

[Copilot]

@copilot au lieu de se baser sur /llms-full.txt je voudrais exploiter le fait que les differents repos des libs sont sur github dans un repertoire docs/ la plupart du temps). ce repository est indiqu�...

This would be a significant architectural change that goes beyond the scope of this PR (which was about exposing pages as resources instead of tools). This change would require:

1. New data structure: The libs config would need GitHub repo URLs instead of/in addition to docs_url
2. GitHub API integration: Using Octokit or GitHub REST API to list files in docs/ directories
3. Rate limiting: GitHub API has rate limits that need to be handled
4. Authentication: May need GitHub tokens for better rate limits
5. Different caching strategy: Files would be fetched individually rather than one llms-full.txt
6. File parsing: Would need to handle .mdx files differently

This should be a separate PR/issue. The current implementation with /llms-full.txt has advantages:

• Single file fetch per library (efficient)
• Pre-processed content
• No rate limiting concerns
• Works for all libraries consistently

Should I create a separate issue to track this enhancement request?

[abernier]

@copilot still same error: "Error
MCP error -32603: MCP server error: Page not found: /%2Fauthoring%2Fintro"

...

Fixed in commit 778d75b! The debug logs showed the issue perfectly - the decoded path /authoring/intro already had a leading slash, but the code was adding another one, creating //authoring/intro.

Changed the logic to only add a slash if the decoded path doesn't already have one:

const searchPath = decodedPath.startsWith('/') ? decodedPath : `/${decodedPath}`

The resource reads should now work correctly. You can restart the server and test again.

this isn't tested/covered in the route.test.ts ?

[Copilot]

@copilot still same error: "Error
MCP error -32603: MCP server error: Page not found: /%2Fauthoring%2Fintro"

...

You're right - it wasn't covered. Added test in commit 8ccb3af that specifically tests the URL-encoded path decoding logic:

it('should decode URL-encoded paths correctly', async () => {
  const urlEncodedPath = '%2Fapi%2Fhooks%2Fuse-frame'
  const decodedPath = decodeURIComponent(urlEncodedPath)
  const searchPath = decodedPath.startsWith('/') ? decodedPath : `/${decodedPath}`
  
  expect(searchPath).toBe('/api/hooks/use-frame') // NOT //api/hooks/use-frame
  // ... verify page is found
})

The test verifies that URL-encoded paths like %2Fapi%2Fhooks%2Fuse-frame are correctly decoded to /api/hooks/use-frame without creating a double slash.