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The Agent Server API reference is available within each deployment at the /docs endpoint (e.g. http://localhost:8124/docs). Browse the full API reference in the Agent Server API section in the sidebar, or see the endpoint groups below:
  • Assistants - Configured instances of a graph
  • Threads - Accumulated outputs of a group of runs
  • Thread Runs - Invocations of a graph/assistant on a thread
  • Stateless Runs - Invocations with no state persistence
  • Crons - Periodic runs on a schedule
  • Store - Persistent key-value store for long-term memory
  • A2A - Agent-to-Agent Protocol endpoints
  • MCP - Model Context Protocol endpoints
  • System - Health checks and server info

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Authentication

For deployments to LangSmith, authentication is required. Pass the X-Api-Key header with each request to the Agent Server. The value of the header should be set to a valid LangSmith API key for the organization where the Agent Server is deployed. Example curl command: 
curl --request POST \
  --url http://localhost:8124/assistants/search \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: LANGSMITH_API_KEY' \
  --data '{
  "metadata": {},
  "limit": 10,
  "offset": 0
}'
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