sentryagent-idp/docs/developers/guides/register-an-agent.md

Register an Agent

This guide covers everything about registering a new agent identity, including all fields, validation rules, and how to fix common errors.

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The registration request

POST /api/v1/agents

Requires: Authorization: Bearer <token> with agents:write scope.

Request fields

Field	Type	Required	Description
email	string (email)	Yes	Unique identifier for this agent. Must be a valid email format and unique across all registered agents.
agentType	string (enum)	Yes	Functional classification of the agent. See values below.
version	string (semver)	Yes	Semantic version of the agent software (e.g. 1.0.0, 2.3.1-beta).
capabilities	string[]	Yes	One or more capability strings in resource:action format. Minimum 1.
owner	string	Yes	Team or organisation that owns this agent. 1–128 characters.
deploymentEnv	string (enum)	Yes	Target deployment environment. See values below.

agentType values

Value	Description
screener	Screens or filters content
classifier	Classifies or categorises inputs
orchestrator	Coordinates other agents or workflows
extractor	Extracts structured data
summarizer	Produces summaries
router	Routes requests to other agents
monitor	Monitors systems or outputs
custom	Any type not covered above

deploymentEnv values

Value	Description
development	Local or dev environment
staging	Pre-production testing
production	Live production workloads

capabilities format

Each capability is a string matching resource:action. Examples:

resume:read
email:send
candidate:score
document:classify
data:*

The * wildcard in the action position means all actions on that resource. Capabilities are informational in Phase 1.

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Example — register a screener agent

curl -s -X POST http://localhost:3000/api/v1/agents \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "screener-001@talent.ai",
    "agentType": "screener",
    "version": "1.0.0",
    "capabilities": ["resume:read", "email:send", "candidate:score"],
    "owner": "talent-acquisition-team",
    "deploymentEnv": "production"
  }' | jq .

Successful response (201 Created):

{
  "agentId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "email": "screener-001@talent.ai",
  "agentType": "screener",
  "version": "1.0.0",
  "capabilities": ["resume:read", "email:send", "candidate:score"],
  "owner": "talent-acquisition-team",
  "deploymentEnv": "production",
  "status": "active",
  "createdAt": "2026-03-28T09:00:00.000Z",
  "updatedAt": "2026-03-28T09:00:00.000Z"
}

The agentId is assigned by the system — it is immutable and never changes.

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Immutable fields

After registration, the following fields cannot be changed:

• agentId — system-assigned, permanent
• email — the agent's stable identity
• createdAt — registration timestamp

To update any other field, use PATCH /api/v1/agents/{agentId}.

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Common errors and fixes

400 VALIDATION_ERROR — invalid email format

{
  "code": "VALIDATION_ERROR",
  "message": "Request validation failed.",
  "details": { "field": "email", "reason": "Must be a valid email address." }
}

Fix: Use a valid email format, e.g. my-agent@myproject.ai.

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400 VALIDATION_ERROR — invalid version format

{
  "code": "VALIDATION_ERROR",
  "message": "Request validation failed.",
  "details": { "field": "version", "reason": "Must be a valid semantic version string." }
}

Fix: Use semantic versioning — 1.0.0, 2.1.3, 1.0.0-beta.1. The format is MAJOR.MINOR.PATCH.

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400 VALIDATION_ERROR — invalid capability format

Capabilities must match resource:action — lowercase letters, numbers, hyphens, and underscores only.

Fix: Use resume:read not Resume:Read or read-resume.

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409 AGENT_ALREADY_EXISTS — duplicate email

{
  "code": "AGENT_ALREADY_EXISTS",
  "message": "An agent with this email address is already registered.",
  "details": { "email": "screener-001@talent.ai" }
}

Fix: Choose a different email address. Each agent must have a unique email.

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403 FREE_TIER_LIMIT_EXCEEDED — 100 agent limit reached

{
  "code": "FREE_TIER_LIMIT_EXCEEDED",
  "message": "Free tier limit of 100 registered agents has been reached.",
  "details": { "limit": 100, "current": 100 }
}

Fix: Decommission agents you no longer need before registering new ones.