ebb-ai — carbon-aware MCP scheduler

@tidegap/mcp

Renamed from @ebb-ai/mcp in 0.18.0. Use the host config key tidegap and npx -y @tidegap/mcp; the ebb-mcp bin and the EBB_* variables were removed in 0.19. See Renamed from Ebb AI.

MCP server that lets your agent run non-urgent LLM tasks at the cleanest grid hour before a deadline.

Add it to any MCP host. When a user says "do this tonight" or "by tomorrow", the agent calls schedule_task. Tidegap then runs the task at the lowest-carbon grid hour before the deadline, and through the provider Batch API when the deadline allows.

• 12 MCP tools (measured), among them recommend_window, schedule_task, check_queue_status, get_grid_forecast, cancel_task, postpone_task, update_deadline.
• Live 72-hour forecast. GB needs no key; other regions use free keys (EIA, ENTSO-E, WattTime, Electricity Maps).
• One signed carbon receipt per task, stored in ~/.tidegap/queue.db.

npx -y @tidegap/mcp

{ "mcpServers": {
    "tidegap": { "command": "npx", "args": ["-y", "@tidegap/mcp"] }
} }

Proof: one real GB run, 2026-09-30. Forecast peak 183 gCO2/kWh vs recommended window 88 gCO2/kWh, about 52 % lower for this run only (forecast, projected). Receipt at dispatch: 158 gCO2/kWh (measured). Host-specific configs: https://www.tidegap.com/docs#install

Run

npx -y @tidegap/mcp

The server speaks MCP over stdio. To wire it into an agent client:

Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json on macOS (Linux/Windows have similar paths):

{
  "mcpServers": {
    "tidegap": {
      "command": "npx",
      "args": ["-y", "@tidegap/mcp"],
      "env": {
        "TIDEGAP_ELECTRICITY_MAPS_API_KEY": "optional - mock data without it",
        "TIDEGAP_DEFAULT_REGION": "US-CAL-CISO"
      }
    }
  }
}

Restart Claude Desktop after editing.

Claude Code

Add tidegap to your ~/.claude/mcp.json (or workspace .claude/mcp.json):

{
  "mcpServers": {
    "tidegap": {
      "command": "npx",
      "args": ["-y", "@tidegap/mcp"]
    }
  }
}

OpenClaw

Add to ~/.openclaw/mcp.json:

{
  "mcpServers": {
    "tidegap": {
      "command": "npx",
      "args": ["-y", "@tidegap/mcp"]
    }
  }
}

Tools exposed (12, measured)

Tool	Purpose
get_grid_forecast(region, hours?)	Hour-by-hour carbon intensity for a region; useful before deciding whether to defer.
recommend_window(deadline, region?, ...)	Plan the cleanest window inside the deadline without queueing anything.
schedule_task(prompt, deadline, model?, region?, carbon_budget_g?, repeat?, origin_session_id?, not_before?)	Queue a task to run in the cleanest window inside the deadline. Returns a task_id and one line that says whether it will run: Runs at <time> local., or the readiness sentence with its fix, for example Tasks will not run: no tick daemon. Run `tidegap install`.. not_before sets the earliest start. repeat defaults to none, also for deadline_kind: "quota_reset".
check_queue_status(task_id?)	Inspect the queue or one specific task; includes a carbon receipt once the task has completed.
cancel_task(task_id, series?)	Cancel a queued or scheduled task; on a repeating task, skip it, or end the series with series: true.
reply_task(task_id, text, deadline?)	Continue a completed task: a new task with the conversation plus this text, same provider and model.
expedite_task(task_id)	Dispatch a queued or scheduled task now, outside its carbon window.
postpone_task(task_id, preset? | until? | delay_minutes?, reset_at?)	"Later": move a pending task later, never earlier. Presets 1h, tonight (22:00 to 06:00), tomorrow_morning (09:00 to 12:00), after_limit_reset (5 minutes after the Claude limit reset: reset_at, else this machine's limit reading, else a reset time given before).
update_deadline(task_id, deadline)	Reschedule a task against a new deadline.
retry_task(task_id)	Re-dispatch a failed task.
cancel_all(status?)	Cancel every task that is still queued or scheduled.
tidegap_usage(include_spend?)	Read-only: the Claude Code subscription limits of this machine and when they reset, and the Codex limits from its local logs. include_spend adds the current 5-hour window's tokens and an API list-price cost estimate.

Environment variables

These variables configure this MCP server (and the tidegap CLI, which reads the same set). They are read at the server's own entry point and injected into @tidegap/core, which is environment-pure and reads nothing ambient itself.

OpenClaw plugin users: the @vitalini/tidegap OpenClaw plugin reads no environment variables. Configure it through plugin config instead, under plugins.entries.tidegap.config in your gateway config — the "Plugin config" column below names the field that replaces each variable. OpenClaw resolves the "${ENV_VAR}" shorthand in those fields, so you can keep exporting the same variables and let the gateway read them on the plugin's behalf.

Var	Plugin config	Purpose
TIDEGAP_ELECTRICITY_MAPS_API_KEY	electricityMapsApiKey	API key from electricitymaps.com. Universal fallback. If unset (and no zone-specific feed is configured), the server falls back to deterministic mock data so you can still run the whole stack locally.
TIDEGAP_EIA_API_KEY	eiaApiKey	Free US EIA key. Enables average-emissions intensity for the US ISO zones (CAISO / ERCOT / ISO-NE / NYISO / PJM / MISO).
TIDEGAP_ENTSOE_SECURITY_TOKEN	entsoeSecurityToken	Free ENTSO-E token. Enables EU zone intensity (FR / DE / ES / IT / NL).
WATTTIME_USERNAME + WATTTIME_PASSWORD	wattTimeUsername + wattTimePassword	Free WattTime v3 account. Enables marginal-emissions (co2_moer) forecasts for the US ISO zones — takes precedence over EIA where covered, falls through to EIA on any error. The marginal signal is disclosed as signalType: "marginal" on forecasts and receipts.
TIDEGAP_DEFAULT_REGION	defaultRegion	Region when a tool call names none. Beats the stored region setting; see Grid region.
ANTHROPIC_API_KEY	anthropicApiKey	Enables the anthropic provider (batch-capable).
OPENAI_API_KEY	openaiApiKey	Enables the openai provider (batch-capable).
GEMINI_API_KEY / GOOGLE_API_KEY	geminiApiKey / googleApiKey	Enables the gemini provider (Generative Language API, sync-only). GEMINI_API_KEY is preferred; GOOGLE_API_KEY is the fallback.
OLLAMA_HOST	ollamaHost	Enables the local ollama provider (sync-only). Default http://localhost:11434; keyless — set this var to opt the provider in.

Grid region

The server resolves the region of each tool call in this order:

1. the tool call's region argument,
2. TIDEGAP_DEFAULT_REGION in the server's environment (the agent host's MCP config),
3. the region setting stored on this machine: tidegap region set <zone>, or Settings → Grid region in tidegap ui and the Mac app (key TIDEGAP_DEFAULT_REGION in ~/.tidegap/config),
4. a guess from the machine's time zone,
5. GB.

The server reads the setting again when the file changes, so a new setting applies on the next tool call with no restart. A stored value that is not a supported zone is ignored, with one stderr warning per change. schedule_task replies carry region_source: flag | env | setting | timezone | fallback.

A region argument must be one of the 31 supported zones (any case). Another value is rejected with the closest zones and a link to request a region, for example Unknown zone UA. Closest: PL. Request a region: <link>. With TIDEGAP_ELECTRICITY_MAPS_API_KEY set, any zone passes, because Electricity Maps serves zones beyond the list; with TIDEGAP_ENTSOE_SECURITY_TOKEN set, IT passes too.

Develop

From the root of a clone of https://github.com/tidegap/tidegap:

pnpm install
pnpm --filter @tidegap/mcp build
node packages/mcp-server/dist/server.js