StartAgent

POST/gitpod.v1.AgentService/StartAgent

Starts (or triggers) an agent run using a provided agent.

Use this method to:

Launch an agent based on a known agent

Examples

Start an agent with a project ID:

agentId: "b8a64cfa-43e2-4b9d-9fb3-07edc63f5971"
codeContext:
  projectId: "2d22e4eb-31da-467f-882c-27e21550992f"

Body ParametersJSONExpand Collapse

agentId: optional string

agent_id identifies the agent to start. If omitted, the backend uses the configured default agent ID, or the Ona in-environment agent when no default is configured.

formatuuid

annotations: optional map[string]

annotations are key-value pairs for tracking external context (e.g., integration session IDs, GitHub issue references). Keys should follow domain/name convention (e.g., “agent-client-session/id”).

codeContext: optional AgentCodeContext { contextUrl, environmentId, projectId, pullRequest }

contextUrl: optional object { environmentClassId, url }

environmentClassId: optional string

formatuuid

url: optional string

formaturi

environmentId: optional string

formatuuid

projectId: optional string

formatuuid

pullRequest: optional object { id, author, draft, 6 more }

Pull request context - optional metadata about the PR being worked on This is populated when the agent execution is triggered by a PR workflow or when explicitly provided through the browser extension

id: optional string

Unique identifier from the source system (e.g., “123” for GitHub PR #123)

author: optional string

Author name as provided by the SCM system

draft: optional boolean

Whether this is a draft pull request

fromBranch: optional string

Source branch name (the branch being merged from)

repository: optional object { cloneUrl, host, name, owner }

Repository information

cloneUrl: optional string

host: optional string

name: optional string

owner: optional string

state: optional State

Current state of the pull request

One of the following:

"STATE_UNSPECIFIED"

"STATE_OPEN"

"STATE_CLOSED"

"STATE_MERGED"

title: optional string

Pull request title

toBranch: optional string

Target branch name (the branch being merged into)

url: optional string

Pull request URL (e.g., “https://github.com/owner/repo/pull/123”)

codexSettings: optional CodexSettings { model, reasoningEffort, serviceTier }

codex_settings contains desired manual settings for the Codex app agent.

model: optional CodexOpenAIModel

CodexOpenAIModel is the static allowlist of concrete OpenAI models that the Codex app runtime can select through Ona’s Codex picker.

One of the following:

"CODEX_OPEN_AI_MODEL_UNSPECIFIED"

"CODEX_OPEN_AI_MODEL_GPT_5_5"

"CODEX_OPEN_AI_MODEL_GPT_5_4"

"CODEX_OPEN_AI_MODEL_GPT_5_4_MINI"

"CODEX_OPEN_AI_MODEL_GPT_5_3_CODEX"

"CODEX_OPEN_AI_MODEL_GPT_5_3_CODEX_SPARK"

"CODEX_OPEN_AI_MODEL_GPT_5_2"

reasoningEffort: optional CodexReasoningEffort

CodexReasoningEffort is the static allowlist of reasoning efforts supported by the Codex app runtime.

One of the following:

"CODEX_REASONING_EFFORT_UNSPECIFIED"

"CODEX_REASONING_EFFORT_LOW"

"CODEX_REASONING_EFFORT_MEDIUM"

"CODEX_REASONING_EFFORT_HIGH"

"CODEX_REASONING_EFFORT_EXTRA_HIGH"

serviceTier: optional CodexServiceTier

CodexServiceTier is the static allowlist of service tiers supported by the Codex app runtime.

One of the following:

"CODEX_SERVICE_TIER_UNSPECIFIED"

"CODEX_SERVICE_TIER_FAST"

mode: optional AgentMode

mode specifies the operational mode for this agent execution If not specified, defaults to AGENT_MODE_EXECUTION

One of the following:

"AGENT_MODE_UNSPECIFIED"

"AGENT_MODE_EXECUTION"

"AGENT_MODE_PLANNING"

"AGENT_MODE_RALPH"

"AGENT_MODE_SPEC"

name: optional string

maxLength100

runnerId: optional string

runner_id specifies a runner for this agent execution. When set, the agent execution is routed to this runner instead of the runner associated with the environment.

formatuuid

sessionId: optional string

session_id is the ID of the session this agent execution belongs to. If empty, a new session is created implicitly.

formatuuid

workflowActionId: optional string

workflow_action_id is an optional reference to the workflow execution action that created this agent execution. Used for tracking and event correlation.

formatuuid

ReturnsExpand Collapse

agentExecutionId: optional string

formatuuid

StartAgent

curl https://app.gitpod.io/api/gitpod.v1.AgentService/StartAgent \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer $GITPOD_API_KEY" \
    -d '{}'

{
  "agentExecutionId": "182bd5e5-6e1a-4fe4-a799-aa6d9a6ab26e"
}

Returns Examples

{
  "agentExecutionId": "182bd5e5-6e1a-4fe4-a799-aa6d9a6ab26e"
}