Agent API troubleshooting — diagnose HTTP 400/401/404/423/500 responses, timeouts, media-type errors, and Government Cloud endpoint issues. Use when an Agentforce Agent API call fails, returns an error status, times out, or when diagnosing EngineConfigLookupException / HttpServerErrorException / Session Already Locked errors.
Installation
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Agent API troubleshooting — diagnose HTTP 400/401/404/423/500 responses, timeouts, media-type errors, and Government Cloud endpoint issues. Use when an Agentforce Agent API call fails, returns an error status, times out, or when diagnosing EngineConfigLookupException / HttpServerErrorException / Session Already Locked errors.
disable-model-invocation
true
Agent API Troubleshooting
Use This Skill When
An Agent API call returns a non-2xx status and you need the likely cause and fix.
A call times out or reports an unexpected media-type / config error.
Diagnosing Government Cloud endpoint mismatches.
Error Matrix
Status
Meaning
Likely cause
Fix
400 Bad Request
Malformed request
Message contains "{VALUE} is not a valid agent ID"
Verify the agent ID (re-fetch via BotDefinition or Legacy URL)
401 Unauthorized
Auth problem
Bad/expired token, flow not enabled
Re-mint token; confirm client credentials flow + Run As user
404 Not Found
Wrong token or endpoint
Incorrect host/path; gov cloud on standard host
Verify endpoint; gov cloud must use api.gov.salesforce.com
423 Locked
Session already locked
Concurrent request on the same session
Serialize turns; only one request in flight per session
500 Internal Server Error
Server-side / config error
See sub-causes below
Match the message/error field below
HTTP 500 sub-causes
Message/Error field contains
Cause
Fix
"Unsupported Media Type"
Wrong Content-Type
Set Content-Type: application/json
EngineConfigLookupException
Wrong domain in start session
Use the Current My Domain URL for instanceConfig.endpoint (not Lightning URL)
HttpServerErrorException
Wrong agent ID in endpoint
Use the correct agent ID (see sf-agent-api-setup)
(timeout)
Call exceeded 120s
The API times out at 120s and returns 500; add client timeout + retry/fallback
other
Setup incomplete
Re-verify Get Started setup steps
Diagnostic Workflow
Capture status code, response message/error fields, and traceId (from streaming events / logs).
Classify using the matrix above.
Verify inputs in order: token validity → base host (standard vs gov) → agent ID → instanceConfig.endpoint (My Domain) → headers (Content-Type, Accept).
Check concurrency if 423 — is another turn still in flight for this session?
Re-test the isolated call (curl / Postman) before changing client code.
Guardrails
Log traceId, sessionId, and the HTTP status on every failure — support cases need traceId.
Never retry a 423 immediately in a tight loop; wait for the in-flight turn to complete.
Distinguish transient 500 (timeout, server) from deterministic 500 (config, media type) before retrying.
On Government Cloud, a 404 usually means the standard host was used — switch to api.gov.salesforce.com.
Re-minting the token fixes most 401s; if not, the flow/Run As configuration is wrong.
Deliverables
A triage note per failure: status, cause, fix, and whether it's transient or deterministic.
A retry/backoff policy that treats 423 and deterministic 500s as non-retryable-as-is.
