Cassini Mission Plan MCP

Cassini Mission Plan MCP

A read-only MCP server over the Cassini-Huygens mission dataset exposing tools for querying activity data such as listing, searching, counting, aggregating, and timeline analysis.

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README

Cassini Mission Plan MCP

A read-only Model Context Protocol server over the Cassini-Huygens mission dataset (~62k activity rows). Built as an AI workshop demo: clean, readable TypeScript that runs live in Claude Desktop.

Live endpoint: https://cassini-mission-plan.redfour.workers.dev

What it does

Exposes 7 MCP tools so an LLM client can query the Cassini master_plan table:

Tool What it answers
list_activities Filtered, paginated rows (date range, team, target)
get_activity Single row by id
search_activities FTS5 full-text search over title + description
count_activities Row count matching the same filters as list
aggregate_activities Group-by counts (team / target / spass_type)
timeline Bucketed counts over a date range (year or month) — zero-filled
list_distinct Distinct values of team / target / spass_type

Architecture

  • Runtime: Cloudflare Workers (TypeScript)
  • Data: Cloudflare D1 (SQLite) — master_plan table + FTS5 virtual table
  • Transport: hand-rolled MCP-over-HTTP (JSON-RPC 2.0 over plain HTTP POST)
  • Validation: zod schemas per tool; errors surface as JSON-RPC error objects

See docs/ARCHITECTURE.md for the full design.

Project setup

npm install

Run tests

npm test                  # Jest — all specs against in-memory SQLite

The deploy spec (spec/deploy-and-initialize.spec.ts) needs a live URL:

DEPLOY_URL=https://cassini-mission-plan.redfour.workers.dev npm test

Deploy (one-time setup)

  1. Create the D1 database:

    npx wrangler d1 create cassini

    Copy the database_id into wrangler.toml.

  2. Import the data (generates data/cassini.d1.sql from data/cassini.db):

    node scripts/import.js      # or: npx ts-node scripts/import.ts
npx wrangler d1 execute cassini --remote --file=data/cassini.d1.sql

  3. Deploy:

    npm run deploy

Local dev

npm run dev   # wrangler dev (uses local D1)

Docs

File What's in it
docs/PROJECT.md Problem, audience, goals, scope
docs/ARCHITECTURE.md Components, data model, key decisions
docs/SPEC.md Tool API reference + functional/non-functional requirements
docs/STORIES.md User stories (source for the spec suite)
docs/PLAN.md Build task checklist (all complete)
docs/MEMORY.md Decision log maintained with Claude Code

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