vtop-mcp-server

A secure Model Context Protocol (MCP) server that gives an AI assistant a read-only, structured interface to the authenticated student's own VIT VTOP account.

• Read-only. Only GET (pages) and POST (read-only data queries) requests are made. No tool can create, submit, or mutate anything in VTOP.

• Manual CAPTCHA only. VTOP requires a CAPTCHA at login. This server never bypasses it — a human solves it once during vtop-mcp login (see Security).

• Own-account only. Every data request is bound to the session's authorizedID, which is extracted from VTOP itself and can never be supplied by a caller.

• Grounded in real VTOP responses. Parsers are built against sanitized captures of the live site (tests/fixtures/*.html). They never invent data that VTOP does not provide (e.g. VTOP's current-credits endpoint has no GPA; the CGPA tool omits it).

Tools

All tools take no arguments and are idempotent. Errors are returned as JSON-RPC errors with a stable code (e.g. AUTHENTICATION_REQUIRED, SESSION_EXPIRED, VTOP_UNAVAILABLE) in error.data.

Related MCP server: TechMCP - PSG College of Technology MCP Server

Requirements

• Python 3.11+ (developed on 3.14)

• An internet connection to https://vtop.vit.ac.in (or VTOP_BASE_URL)

Install

python -m venv .venv
.venv/bin/pip install -e .

Authenticate (one time; manual CAPTCHA)

vtop-mcp login            # prompts username + hidden password, shows CAPTCHA image

The CAPTCHA image is written to a 0600 temp file and auto-opened if xdg-open/open is available (use --no-open otherwise). You type the characters you see; the value is never stored or logged. On success the session (cookies + CSRF + authorizedID) is persisted to .vtop-session/session.json with 0600 permissions.

Run the MCP server

vtop-mcp serve

This serves MCP stdio — the standard transport used by Claude Desktop, opencode, and others.

Example MCP client configuration (opencode / Claude Desktop):

{
  "mcpServers": {
    "vtop": {
      "command": "/absolute/path/to/vtop-mcp",
      "args": ["serve"]
    }
  }
}

Other commands

vtop-mcp status    # is there a session, and is it valid against VTOP?
vtop-mcp logout    # invalidate the in-memory session and delete the session file

Configuration (environment variables)

All optional; defaults in parentheses.

Never put a password in .env or environment variables.

Security model

• Manual CAPTCHA is a deliberate boundary — VTOP login is impossible without a human solving it; the server keeps it that way. There is no CAPTCHA bypass, solver, or token reuse anywhere. A session expires and the operator re-runs vtop-mcp login.

• Secrets are never logged. A logging Redactor masks CSRF tokens, UUIDs, cookies, authorizedID, the username, Authorization/Cookie headers, and CAPTCHA values. See vtop_mcp/redaction.py.

• The session is the source of truth. authorizedID and CSRF come from the bound session (extracted from VTOP), never from tool callers, so an MCP client cannot ask the server to act for another account.

• Persistence is 0600 and expiring. Session files are written with ownership-only permissions and have a hard 6‑hour maximum age.

• Login may be disabled with VTOP_ENABLE_LOGIN=false, in which case only a previously established session can be used.

• Rate limiting + retries protect VTOP; authentication requests are never retried and authorization rejection is detected eagerly (a /vtop/login redirect on a data query maps to SESSION_EXPIRED).

Development

.venv/bin/pip install -e ".[dev]"
.venv/bin/python -m pytest -q        # 120 tests

The test suite runs against a mock VTOP server (mock_vtop/server.py) that reproduces the discovered auth flow (pre-login chain, manual CAPTCHA, session cookies/CSRF) and serves the real sanitized fixtures. It is also runnable standalone for manual testing:

.venv/bin/python -m mock_vtop.server    # http://127.0.0.1:8734 (captcha=K7M2P9)

Layout

src/vtop_mcp/
  cli.py                  # serve / login / logout / status
  config.py               # env-driven settings
  errors.py               # stable, secret-free error codes
  redaction.py            # secret masking for logs
  logging_setup.py        # app logger + correlation ids
  metrics.py              # aggregate, privacy-conscious counters
  models/                 # typed pydantic outputs (VTOP-faithful)
  vtop/
    endpoints.py          # single source of truth for VTOP routes
    csrf.py              # token extraction/validation
    session.py           # session state + secure persistence
    client.py            # httpx client, CSRF-aware auth, expiry detection
    auth.py              # session manager (manual login, dispose)
    cache.py             # TTL cache scoped per authorizedID
    parsers/             # cgpa, courses, assignments, events, feedback, proctor
  services/academic.py    # service layer over client + parsers + cache
  server/
    schemas.py            # tool output models
    tools.py             # tool specs + error mapping
    mcp_server.py        # MCP transport wiring (stdio)
mock_vtop/server.py       # local mock VTOP server for dev/tests
tests/                    # unit + integration + end-to-end MCP tests
docs/vtop-endpoints.md    # discovered endpoint map (tool → endpoint → parser)

Limitations (faithful to VTOP)

• VTOP's current-credits endpoint does not expose a GPA — the CGPA tool reports CGPA and credits only.

• The course-details endpoint exposes attendance % + remarks, not marks or assessment components — get_marks reports availability explicitly rather than fabricating data.

• The proctor-message endpoint can legitimately return nothing.

License

MIT