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Jules MCP Server

MCP server that exposes Google Jules capabilities using @google/jules-sdk. This unified implementation uses the SDK plus direct API calls where needed, while keeping SDK-backed caching, snapshots, and artifact handling. MCP tools may use either the SDK or the REST API, whichever is the best fit for the specific operation.

Setup

  1. Install dependencies

  2. Provide JULES_API_KEY via environment or ~/.jules/config.json

  3. Build the server

npm install npm run build

Run locally:

JULES_API_KEY=your_api_key node dist/cli.js

OpenCode Integration

This repo includes a project-level OpenCode config at .opencode/opencode.json. For global setup, add to ~/.config/opencode/opencode.json (update the command path to where you built this server):

{ "$schema": "https://opencode.ai/config.json", "mcp": { "jules": { "type": "local", "command": ["node", "/path/to/your/jules-mcp/dist/cli.js"], "environment": { "JULES_API_KEY": "your_api_key" } } } }

Antigravity Integration

Example OpenCode plugin enablement snippet (merge into your config):

{ "$schema": "https://opencode.ai/config.json", "plugins": { "opencode-antigravity-auth": { "enabled": true } } }

Tools

SDK Tools

Tool

Purpose

Key Params

Returns

create_session

Create a new Jules session or automated run (supports repoless sessions).

prompt (req)

repo

branch

interactive

autoPr

Session created. ID: <sessionId>

list_sessions

List recent sessions with pagination.

pageSize

pageToken

{ sessions: [...], nextPageToken? }

get_session_state

Session dashboard (status, last activity/message, pending plan).

sessionId (req)

Status object with activity/message/plan context

send_reply_to_session

Approve plan, send a message, or ask and wait for a reply.

sessionId (req)

action (approve/send/ask)

message (send/ask)

Confirmation or agent reply

get_code_review_context

Summarize code changes with file list and metadata.

sessionId (req)

activityId

format

filter

detail

Formatted summary string

show_code_diff

Get the unified diff for a session or file.

sessionId (req)

file

activityId

Unified diff text

query_cache

Query the local cache using JQL.

query (req)

{ results: [...], _meta? }

Query example:

{ "query": { "from": "sessions", "where": { "state": "failed" }, "limit": 5 } }

Additional Tools (jules_*)

These tools are part of the same unified server and expose REST-style workflows plus convenience operations. They may use the SDK or the REST API under the hood, depending on which path is required for the operation. They return a structured ToolResult object:

{ success, message, data?, error?, suggestedNextSteps? }

Tool

Purpose

Key Params

Notes

jules_list_sources

List connected repositories.

pageSize

pageToken

Returns { sources, hasMore, nextPageToken }

jules_get_source

Get details for a connected repository.

source (req)

Accepts sources/github/owner/repo or owner/repo

jules_create_session

Create a session with automation settings.

prompt (req)

repo (req)

branch

title

automationMode

requirePlanApproval

Draft PR falls back to AUTO_CREATE_PR if not supported

jules_get_session

Get session status/details.

sessionId (req)

jules_list_sessions

List sessions with pagination.

pageSize

pageToken

jules_approve_plan

Approve a pending plan.

sessionId (req)

jules_reject_plan

Reject a plan with feedback.

sessionId (req)

feedback

Uses REST endpoint

jules_send_message

Send a message to a session.

sessionId (req)

message (req)

jules_cancel_session

Cancel a running session.

sessionId (req)

Uses REST endpoint

jules_list_activities

List activities in a session.

sessionId (req)

pageSize

pageToken

jules_get_latest_activity

Get most recent activity.

sessionId (req)

jules_get_session_plan

Get latest plan (if generated).

sessionId (req)

Plan rejection detection uses REST activity listing

jules_wait_for_completion

Wait for completion or timeout.

sessionId (req)

timeoutMs

pollIntervalMs

jules_wait_for_plan

Wait for plan generation.

sessionId (req)

timeoutMs

jules_create_and_wait

Create and optionally wait for completion.

prompt (req)

repo (req)

branch

title

automationMode

waitForCompletion

timeoutMs

requirePlanApproval

Draft PR falls back to AUTO_CREATE_PR if not supported

jules_quick_task

Create session with defaults and wait.

prompt (req)

repo (req)

branch

createPr

jules_get_session_summary

Combined session + activity summary.

sessionId (req)

jules_sync_local_codebase

Apply Jules diff to a local git repo.

sessionId (req)

repoPath

activityId

file

dryRun

allowDirty

autoStash

threeWay

Refuses dirty trees by default unless allowDirty=true or autoStash=true

Hidden Tool (Not Listed in MCP)

Tool

Purpose

Key Params

Notes

get_bash_outputs

Get bash command outputs from a session.

sessionId (req)

activityIds

Not listed in MCP discovery

Behavior Notes

  • AUTO_CREATE_DRAFT_PR is not supported by the SDK. When requested for jules_create_session or jules_create_and_wait, the server retries with AUTO_CREATE_PR.

  • jules_reject_plan and jules_cancel_session use direct REST endpoints when the SDK does not expose public helpers.

  • Plan rejection status depends on a planRejected activity; if the API does not emit it, the status remains pending_approval.

  • jules_sync_local_codebase applies patches via git apply and refuses dirty working trees unless allowDirty=true or autoStash=true.

Configuration

The server reads configuration from:

  • JULES_API_KEY env var or ~/.jules/config.json

  • Optional overrides:

    • JULES_API_BASE_URL

    • JULES_API_TIMEOUT or JULES_REQUEST_TIMEOUT_MS

    • JULES_POLL_INTERVAL

    • JULES_RATE_LIMIT_MAX_RETRY_MS

    • JULES_RATE_LIMIT_BASE_DELAY_MS

    • JULES_RATE_LIMIT_MAX_DELAY_MS

CLI

The CLI supports doctor and config commands (like the official SDK MCP):

# Check environment and API connectivity jules-mcp-server doctor # Save API key to ~/.jules/config.json jules-mcp-server config --key YOUR_KEY

Credits

Special thanks to David East for building the SDK and API on which this MCP is based.

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