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Letta

Letta Runs, Jobs and Steps API

Asynchronous execution history behind agent messages.

Documentation Provider Profile APIs.io OpenAPI GitHub

Letta Runs, Jobs and Steps API is one of 49 APIs that Letta publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Runs, Jobs and Steps. The published artifact set on APIs.io includes an OpenAPI specification.

This API exposes 21 operations across 19 paths, and defines 6 schemas. It is described by OpenAPI 3.2.0, at version 1.0.0.

Requests are made against 2 base URLs: https://api.letta.com/v1, http://localhost:8283/v1.

21 operations 19 paths 6 schemas 2 DELETE16 GET2 PATCH1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
1.0.0
Base URL
https://chat.letta.com
Authentication
HTTP Bearer
Contact
Letta
License
Apache-2.0
Resource Areas
1

Authentication & Security 1

Letta Runs, Jobs and Steps API declares 1 security scheme for authenticating requests. It accepts HTTP bearer tokens (bearerAuth). By default, every request must be authenticated.

  • bearerAuth — API key created at https://app.letta.com/api-keys, passed as Authorization: Bearer YOURAPIKEY.

Paths & Operations 21

Across 19 paths, the API surfaces 21 operations — 2 DELETE, 16 GET, 2 PATCH, 1 POST. Each is listed below with its method, path, parameters, and response codes.

Runs, Jobs and Steps 21

Asynchronous execution history behind agent messages.

GET
/v1/runs/
List Runs
13 params → 200401
GET
/v1/runs/activedeprecated
List Active Runs
2 params → 200401
GET
/v1/runs/{run_id}
Retrieve Run
1 param → 200401404
DELETE
/v1/runs/{run_id}
Delete Run
1 param → 200401404
GET
/v1/runs/{run_id}/messages
List Messages For Run
6 params → 200401404
GET
/v1/runs/{run_id}/metrics
Retrieve Metrics For Run
1 param → 200401404
GET
/v1/runs/{run_id}/steps
List Steps For Run
6 params → 200401404
POST
/v1/runs/{run_id}/stream
Retrieve Stream For Run
1 param body → 200401404422
GET
/v1/runs/{run_id}/trace
Retrieve Trace For Run
2 params → 200401404
GET
/v1/runs/{run_id}/usage
Retrieve Usage For Run
1 param → 200401404
GET
/v1/jobs/
List Jobs
8 params → 200401
GET
/v1/jobs/activedeprecated
List Active Jobs
5 params → 200401
GET
/v1/jobs/{job_id}
Retrieve Job
1 param → 200401404
DELETE
/v1/jobs/{job_id}
Delete Job
1 param → 200401404
PATCH
/v1/jobs/{job_id}/cancel
Cancel Job
1 param → 200401404422
GET
/v1/steps/
List Steps
14 params → 200401
GET
/v1/steps/{step_id}
Retrieve Step
1 param → 200401404
PATCH
/v1/steps/{step_id}/feedback
Modify Feedback For Step
1 param body → 200401404422
GET
/v1/steps/{step_id}/messages
List Messages For Step
6 params → 200401404
GET
/v1/steps/{step_id}/metrics
Retrieve Metrics For Step
1 param → 200401404
GET
/v1/steps/{step_id}/trace
Retrieve Trace For Step
1 param → 200401404

Schemas 6

The contract defines 6 schemas that model the data the API accepts and returns. The most detailed are Step (10 properties), Run (9 properties), Job (7 properties), LettaMessage (4 properties). Each schema is shown below with its type and property counts.

Job
object
A background job, such as a file-processing or batch operation.
7 properties
HTTPValidationError
object
1 property
Error
object
1 property
Run
object
An asynchronous execution of an agent turn.
9 properties
LettaMessage
object
A single message in an agent conversation (user, assistant, tool call/return, or reasoning).
4 properties
Step
object
A single model call within a run.
10 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

letta-runs-jobs-and-steps-api-openapi.yml Raw ↑

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#Runs, Jobs and Steps
← Back to L APIs
API Details
ID
letta:letta-runs-jobs-and-steps-api
Base URL
https://chat.letta.com
Docs
https://github.com/letta-ai/letta-code
Provider
Letta
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