Jules API Skill

Interact with the Google Jules AI coding agent via its REST API. Jules can autonomously execute coding tasks on your GitHub repositories — writing code, fixing bugs, adding tests, and creating pull requests.

Base URL: https://jules.googleapis.com/v1alpha Auth: Pass your API key via the x-goog-api-key header. Get one at jules.google.com/settings.

List Sources (Connected Repositories)

Discover which GitHub repos are connected to your Jules account:

curl -s -H "x-goog-api-key: $JULES_API_KEY" \
  "https://jules.googleapis.com/v1alpha/sources?pageSize=30"

With pagination:

curl -s -H "x-goog-api-key: $JULES_API_KEY" \
  "https://jules.googleapis.com/v1alpha/sources?pageSize=10&pageToken=PAGE_TOKEN"

Filter specific sources:

curl -s -H "x-goog-api-key: $JULES_API_KEY" \
  "https://jules.googleapis.com/v1alpha/sources?filter=name%3Dsources%2Fgithub-owner-repo"

Get a Source

Get details and branches for a specific repo:

curl -s -H "x-goog-api-key: $JULES_API_KEY" \
  "https://jules.googleapis.com/v1alpha/sources/SOURCE_ID"

Example: sources/github-myorg-myrepo — replace with your actual source ID from List Sources.

Create a Session (Start a Coding Task)

Create a new Jules session to execute a coding task on a repo:

curl -s -X POST \
  -H "x-goog-api-key: $JULES_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "TASK_DESCRIPTION",
    "title": "OPTIONAL_TITLE",
    "sourceContext": {
      "source": "sources/github-OWNER-REPO",
      "githubRepoContext": {
        "startingBranch": "main"
      }
    },
    "requirePlanApproval": true
  }' \
  "https://jules.googleapis.com/v1alpha/sessions"

Parameters

Parameter	Required	Description
`prompt`	Yes	The task description for Jules to execute
`title`	No	Optional title (auto-generated if omitted)
`sourceContext.source`	Yes	Source resource name (e.g. `sources/github-owner-repo`)
`sourceContext.githubRepoContext.startingBranch`	Yes	Branch to start from (e.g. `main`, `develop`)
`requirePlanApproval`	No	If `true`, plans need explicit approval before execution
`automationMode`	No	Set to `AUTO_CREATE_PR` to auto-create PRs when done

Auto-approve + Auto-PR example

curl -s -X POST \
  -H "x-goog-api-key: $JULES_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "Add comprehensive unit tests for the auth module",
    "sourceContext": {
      "source": "sources/github-myorg-myrepo",
      "githubRepoContext": { "startingBranch": "main" }
    },
    "automationMode": "AUTO_CREATE_PR"
  }' \
  "https://jules.googleapis.com/v1alpha/sessions"

List Sessions

List all your Jules sessions:

curl -s -H "x-goog-api-key: $JULES_API_KEY" \
  "https://jules.googleapis.com/v1alpha/sessions?pageSize=10"

Paginate with pageToken:

curl -s -H "x-goog-api-key: $JULES_API_KEY" \
  "https://jules.googleapis.com/v1alpha/sessions?pageSize=10&pageToken=NEXT_PAGE_TOKEN"

Get a Session

Retrieve a single session by ID (includes outputs like PRs if completed):

curl -s -H "x-goog-api-key: $JULES_API_KEY" \
  "https://jules.googleapis.com/v1alpha/sessions/SESSION_ID"

Session States

State	Meaning
`QUEUED`	Waiting to be processed
`PLANNING`	Jules is analyzing and creating a plan
`AWAITING_PLAN_APPROVAL`	Plan ready, waiting for user approval
`AWAITING_USER_FEEDBACK`	Jules needs additional input
`IN_PROGRESS`	Jules is actively working
`PAUSED`	Session is paused
`COMPLETED`	Task completed successfully
`FAILED`	Task failed to complete

Approve a Plan

When a session is in AWAITING_PLAN_APPROVAL state, approve the plan:

curl -s -X POST \
  -H "x-goog-api-key: $JULES_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{}' \
  "https://jules.googleapis.com/v1alpha/sessions/SESSION_ID:approvePlan"

Send a Message

Send feedback, answer questions, or give additional instructions to an active session:

curl -s -X POST \
  -H "x-goog-api-key: $JULES_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "YOUR_MESSAGE_HERE"
  }' \
  "https://jules.googleapis.com/v1alpha/sessions/SESSION_ID:sendMessage"

Use this when session state is AWAITING_USER_FEEDBACK or to provide additional guidance during IN_PROGRESS.

List Activities (Monitor Progress)

Get all events/progress for a session:

curl -s -H "x-goog-api-key: $JULES_API_KEY" \
  "https://jules.googleapis.com/v1alpha/sessions/SESSION_ID/activities?pageSize=50"

Get activities after a specific timestamp (for polling):

curl -s -H "x-goog-api-key: $JULES_API_KEY" \
  "https://jules.googleapis.com/v1alpha/sessions/SESSION_ID/activities?createTime=2026-01-17T00:03:53Z"

Activity Types

Activities will contain exactly one of these event fields:

Event	Description
`planGenerated`	Jules created a plan (contains `plan.steps[]`)
`planApproved`	A plan was approved
`userMessaged`	User sent a message
`agentMessaged`	Jules sent a message
`progressUpdated`	Status update during execution
`sessionCompleted`	Session finished successfully
`sessionFailed`	Session encountered an error (contains `reason`)

Artifacts

Activities may include artifacts:

ChangeSet: Code changes with gitPatch (unified diff, base commit, suggested commit message)
BashOutput: Command output with command, output, exitCode
Media: Binary output with mimeType and base64 data

Get a Single Activity

curl -s -H "x-goog-api-key: $JULES_API_KEY" \
  "https://jules.googleapis.com/v1alpha/sessions/SESSION_ID/activities/ACTIVITY_ID"

Delete a Session

curl -s -X DELETE \
  -H "x-goog-api-key: $JULES_API_KEY" \
  "https://jules.googleapis.com/v1alpha/sessions/SESSION_ID"

Typical Workflow

List sources to find the repo resource name
Create a session with a prompt describing the task
Poll the session (Get Session) to track state changes
List activities to monitor progress and read Jules' messages
If requirePlanApproval was set, approve the plan when state is AWAITING_PLAN_APPROVAL
If state is AWAITING_USER_FEEDBACK, send a message with your response
When COMPLETED, get the session to find the output PR URL

Error Handling

Code	Meaning
200	Success
400	Bad request (invalid parameters)
401	Unauthorized (invalid/missing API key)
403	Forbidden (insufficient permissions)
404	Not found
429	Rate limited
500	Server error

Error responses return:

{
  "error": {
    "code": 400,
    "message": "Invalid session ID format",
    "status": "INVALID_ARGUMENT"
  }
}

Notes

Get your API key from jules.google.com/settings
Store it as the JULES_API_KEY environment variable
Sources (repos) are connected via the Jules web UI at jules.google — the API is read-only for sources
Session resource names follow the pattern sessions/{sessionId}
Activity resource names follow sessions/{sessionId}/activities/{activityId}
All list endpoints support pageSize (1-100) and pageToken for pagination

google-jules