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LangWatch Annotations API

The Annotations API from LangWatch — 3 operation(s) for annotations.

LangWatch Annotations API is one of 28 APIs that LangWatch publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Annotations. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.

This API exposes 6 operations across 3 paths, and defines 2 schemas. It is described by OpenAPI 3.1.0, at version 1.0.0.

Requests are made against a single base URL, https://app.langwatch.ai.

6 operations 3 paths 2 schemas 1 DELETE3 GET1 PATCH1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.1.0
API Version
1.0.0
Server
https://app.langwatch.ai
Authentication
API Key, HTTP Bearer
Resource Areas
1

Authentication & Security 2

LangWatch Annotations API declares 2 security schemes for authenticating requests. An API key is passed in the header as X-Auth-Token (project_api_key). It accepts HTTP bearer tokens (admin_api_key). By default, every request must be authenticated.

  • project_api_key — Project API key for sending traces and accessing project-scoped resources. Format: sk-lw-... (no underscore). Obtain one by creating a project via the Admin AP…
  • admin_api_key — Admin API key for organization-level operations (managing projects, API keys). Create one in Settings API Keys or via POST /api/api-keys. Format: sk-lw-{id}{se…

Paths & Operations 6

Across 3 paths, the API surfaces 6 operations — 1 DELETE, 3 GET, 1 PATCH, 1 POST. Each is listed below with its method, path, parameters, and response codes.

Annotations 6
GET
/api/annotations
Returns all annotations for project
→ 200400
GET
/api/annotations/trace/{id}
Returns all annotations for single trace
1 param → 200400
POST
/api/annotations/trace/{id}
Create an annotation for a single trace
1 param body → 200400
GET
/api/annotations/{id}
Returns a single annotation based on the ID supplied
1 param → 200400
DELETE
/api/annotations/{id}
Deletes a single annotation based on the ID supplied
1 param → 200400
PATCH
/api/annotations/{id}
Updates a single annotation based on the ID supplied
1 param body → 200400

Schemas 2

The contract defines 2 schemas that model the data the API accepts and returns. The most detailed are Annotation (9 properties), Error (2 properties). Each schema is shown below with its type and property counts.

Annotation
object
9 properties 1 required
Error
object
2 properties 2 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

langwatch-annotations-api-openapi.yml Raw ↑

Other APIs LangWatch publishes across the network.

LangWatch Agents API
LangWatch Analytics API
LangWatch Api Keys API
LangWatch Budgets API
LangWatch Cache Rules API
LangWatch Dashboards API
LangWatch Dataset API
LangWatch Evaluations V3 API
LangWatch Evaluators API
LangWatch Graphs API
LangWatch LangWatch API API
LangWatch Model Defaults API
Where this information came from

This is an independent, third-party profile of LangWatch Annotations API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

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