schulcloud-mcp

An MCP server that gives Claude read-only access to a Schulcloud account — courses, boards, lessons, tasks — and reads the attached files, so you can ask about your coursework instead of downloading PDFs and uploading them by hand.

Built and verified against schulcloud-thueringen.de with a live student account. Everything in docs/API.md was confirmed against the running instance, not inferred from the upstream source.

What Claude can do with it

"What do I have due this week?" "Find the material about Verschlüsselung and explain the Caesar cipher worksheet." "Summarise the routing lesson from the LF10 course."

Thirteen tools, all read-only:

whoami	account, school, roles — also a connectivity check
list_courses	all courses, with ids
get_dashboard	the tiles as pinned on the web dashboard
get_course	one course's boards, topics and tasks
get_board	a column board in full: columns, cards, text, links, files
get_lesson	a topic's text sections, materials, files and tasks
list_tasks	homework across all courses, by due date
get_task	one task: description, due date, status, attachments
list_files	files attached to any entity
download_file	fetch a file and extract its text, or view an image
search	keyword search across courses, boards, files and tasks
list_news	school and course announcements
api_get	GET-only escape hatch for uncovered API surface

download_file extracts text from PDF, DOCX, XLSX, PPTX and OpenDocument files and returns images inline for Claude to look at. Verified against real files in the account: a 93-file PDF corpus, DOCX, ODT and PPTX all extract correctly.

Quick start

cp .env.example .env        # fill in TSC_URL and TSC_JWT_COOKIE
npm install
npm run build
npm run probe               # verifies the token and API against the live instance

Then either deploy it as a remote connector, or point Claude Code at dist/bin/stdio.js. Both paths are in docs/DEPLOYMENT.md.

Getting TSC_JWT_COOKIE takes four clicks in DevTools. Expect to redo it often until the session question in docs/AUTH.md is settled — sessions have been observed ending ~2 h after login.

Design decisions

Bearer token plus a keepalive. The instance's jwt cookie works verbatim as Authorization: Bearer — no cookie jar, no connect.sid. But the token's exp claim (30 days) is not its lifetime: the session ends about two hours after login, and measurement showed that ordinary API reads do not extend it, despite the upstream source saying they should. So the server calls refresh-session every 30 minutes — the one non-GET request here, and not exposed as a tool. Whether that is enough is still being measured; see docs/AUTH.md, which has the endurance test and the open question.

Read-only by construction. Every method on the API client is a GET, including api_get. The endpoint is internet-facing by necessity (Claude's connectors call it from Anthropic's cloud), so the fact that a leaked token cannot be used to act as the user is the main safety property. Adding one write tool would forfeit it.

Stateless. No database, despite one being available on the host. 26 courses is not a caching problem, and a cache would introduce staleness questions that live calls simply do not have.

Assembled, not raw. get_board makes three kinds of upstream call and stitches the results — board skeleton, card bodies, and a files-storage lookup per file element — because a model asking "what's on this board" wants the answer, not a traversal plan. Output is Markdown with ids preserved for follow-up calls, not raw JSON.

Layout

src/
  bin/          stdio and http entry points
  schulcloud/   API client, response types, board assembly
  tools/        one module per group of MCP tools
  http/         express app, bearer auth
  extract.ts    document → text
  render.ts     formatting helpers
docs/           API findings, auth, deployment
deploy/         Caddyfile snippet
scripts/        probe (verify against live) and smoke (end-to-end)
vendor/         upstream clones, git-ignored, for reference only

Development

npm run dev        # watch mode, runs src/ directly
npm test           # unit tests, no network
npm run probe      # check assumptions against the live instance
npm run smoke      # full end-to-end: real server, real client, real data
npm run session-diagnose  # instrument what actually ends the session (~2.5h)
npm run typecheck

npm run smoke starts the HTTP server, connects a real MCP client over Streamable HTTP and exercises every tool against the live account — 30 checks covering the auth gate, the protocol handshake, every content chain, file extraction, api_get's guard rails and error handling.

Upstream

Reference clones live in vendor/ (git-ignored):

git clone --depth 1 --filter=blob:none https://github.com/hpi-schul-cloud/schulcloud-server.git vendor/schulcloud-server
git clone --depth 1 --filter=blob:none https://github.com/hpi-schul-cloud/file-storage.git      vendor/file-storage
git clone --depth 1 --filter=blob:none https://github.com/hpi-schul-cloud/nuxt-client.git       vendor/nuxt-client

Most of that organisation's ~100 repositories are archived or superseded; those three are the live ones that matter. The instance's own OpenAPI documents (/api/v3/docs-json, /api/v3/file/docs-json) are more authoritative than any of them — see docs/API.md.