octopus-mcp

Unofficial. Not affiliated with Octopus Energy. Uses the public REST API and the community-known Kraken GraphQL endpoint; the latter is unofficial and may break without notice.

A Model Context Protocol server that lets Claude analyse your Octopus Energy account: usage, costs, tariff comparisons, Saving Sessions, Octoplus rewards.

Works with Claude Code, Claude Desktop, and any MCP-compatible client.

Install

Claude Code (recommended)

# 1. Install the MCP server
uv tool install octopus-mcp

# 2. Save your credentials in your OS keychain
octopus-mcp configure

# 3. Install the plugin from this repo (in Claude Code):
/plugin install DanielChicot/octopus-mcp

Claude Desktop / Cursor / other MCP clients

Install the server, configure credentials, then add to your MCP client config:

{
  "mcpServers": {
    "octopus": {
      "command": "uvx",
      "args": ["octopus-mcp"]
    }
  }
}

For Claude Desktop, the config lives at ~/Library/Application Support/Claude/claude_desktop_config.json (macOS).

Credentials

You need:

• OCTOPUS_API_KEY — find at octopus.energy → My account → Personal details → Developer settings
• OCTOPUS_ACCOUNT_NUMBER — A-XXXXXXXX, on any bill or in your account

Optional (only some Kraken queries):

• OCTOPUS_EMAIL / OCTOPUS_PASSWORD

Resolution order: shell env > .env > OS keyring > error. The recommended path is octopus-mcp configure which writes to the OS keyring so secrets never sit in plaintext config.

Tools

Slash commands (Claude Code plugin)

• /octopus:bill [period] — bill summary as a markdown table
• /octopus:compare <product-code> [period] — tariff comparison with caveats
• /octopus:peaks [period] [top_n] — highest-usage half-hours
• /octopus:saving-sessions — Octoplus history

How it works

• A SQLite cache at ~/Library/Caches/octopus-mcp/ (or your platform's equivalent) holds your historical consumption and tariff data, refreshed incrementally.
• All cost figures are in integer pence inc-VAT (no float drift), with a derived pounds string for display.
• Tariff comparison is a pure tariff swap model — caveats list what it does and doesn't model. See the design doc.

Known limitations (v0.1)

• Gas SMETS2 m³ vs kWh: if your gas meter reports in m³, values won't be normalised — expect implausibly small numbers and multiply by ~11.18 to convert. v0.2 will detect and apply calorific conversion automatically.
• Region-aware tariff lookup: compare_tariff currently picks the first region's tariff variant from a target product. v0.2 will use your postcode-derived region.
• TTLs are hardcoded: no config.toml support yet.
• No background sync: consumption is fetched lazily on demand.

Privacy

The MCP runs on your machine. No data leaves your computer except direct calls to api.octopus.energy. Credentials live in your OS keychain. Logs at ~/Library/Logs/octopus-mcp/server.log redact secrets.

Contributing

See CONTRIBUTING.md. Run pre-commit run --all-files before pushing.

License

MIT — see LICENSE.