AgentTrust

AgentTrust

Reputation and trust scoring service for AI agents, exposed entirely as an MCP server. Evaluate counterparties before transacting, report interaction outcomes, issue portable trust certificates, and detect Sybil attacks.

Table of Contents

• Quickstart
• Connecting to the MCP Server
• Authentication
• Tools Reference
• Discovery
• Agent Management
• register_agent
• generate_agent_token
• whoami
• agent_status
• get_agent_profile
• search_agents
• link_agentauth
• verify_link_proof
• Trust Scoring
• Interaction Reporting
• Disputes
• Attestations
• issue_attestation
• list_my_attestations
• verify_attestation
• Sybil Detection
• Resources
• Prompts
• Score Types
• Rate Limits
• Self-Hosting

---

Quickstart

1. Connect to the MCP server

Add AgentTrust to your MCP client configuration:

{

"mcpServers": { "agent-trust": { "url": "https://agent-trust.radi.pro/mcp" } } }

Or for local development via stdio:

{

"mcpServers": { "agent-trust": { "command": "uv", "args": ["run", "python", "-m", "agent_trust.server"] } } }

2. Register your agent

register_agent(display_name="my-agent", capabilities=["search", "summarize"])

Response:

{

"agent_id": "550e8400-e29b-41d4-a716-446655440000", "source": "standalone", "scopes": ["trust.read", "trust.report"], "created": true, "public_key_hex": "a1b2c3...", "private_key_hex": "d4e5f6...", "warning": "Key pair auto-generated. Store private_key_hex securely." }

Store the `private_key_hex` immediately -- it is shown only once.

3. Generate an access token

generate_agent_token(

agent_id="550e8400-...", private_key_hex="d4e5f6..." )

Response:

{

"access_token": "eyJ...", "expires_at": "2026-03-20T13:00:00+00:00", "ttl_minutes": 60, "agent_id": "550e8400-..." }

4. Check trust before transacting

check_trust(agent_id="counterparty-uuid")

5. Report interaction outcomes

report_interaction(

counterparty_id="counterparty-uuid", interaction_type="transaction", outcome="success", access_token="eyJ..." )

Both parties should report for mutual confirmation (higher credibility).

---

Connecting to the MCP Server

AgentTrust supports two MCP transports:

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Authentication

AgentTrust supports two authentication methods. Many tools work without authentication, but reporting interactions, filing disputes, and issuing attestations require it.

AgentAuth (preferred)

Obtain a bearer token from AgentAuth and pass it as access_token. This provides the full set of scopes:

Standalone (Ed25519)

Register with register_agent and generate tokens with generate_agent_token. Provides trust.read and trust.report scopes. You can upgrade to AgentAuth later via link_agentauth.

No authentication

Tools marked as "Auth: none" work without any token. Useful for checking trust scores and verifying attestations.

---

Tools Reference

Discovery

discover

Auth: none

Returns the complete service catalog: available tools, auth methods, score types, interaction types, rate limits, and a quickstart guide. Call this first when connecting.

discover()

---

Agent Management

register_agent

Auth: none

Register a new agent in the trust network. Three paths:

1. AgentAuth -- pass access_token from AgentAuth
2. Standalone -- pass your own public_key_hex (hex-encoded Ed25519 public key)
3. Auto-generate -- omit both to get a keypair generated for you

register_agent(

display_name="my-search-agent", capabilities=["search", "summarize"] )

generate_agent_token

Auth: none (uses private key directly)

Generate a signed JWT access token for standalone agents.

generate_agent_token(

agent_id="550e8400-...", private_key_hex="d4e5f6...", ttl_minutes=120 )

whoami

Auth: required

Check your identity, current trust scores, and scopes.

whoami(access_token="eyJ...")

get_agent_profile

Auth: none (authenticated calls get extra detail)

Retrieve the public profile for any agent.

get_agent_profile(agent_id="550e8400-...")

search_agents

Auth: none

Search agents by trust score, capabilities, and interaction count.

search_agents(min_score=0.7, capabilities=["code-review"], limit=10)

link_agentauth

Auth: required (AgentAuth token)

Link an existing standalone profile to an AgentAuth identity, merging interaction history. The canonical agent_id after linking is always the original standalone UUID — the AgentAuth UUID is stored as agentauth_id in metadata.

Response:

{

"agent_id": "550e8400-...", "canonical_agent_id": "550e8400-...", "agentauth_id": "aa-uuid-...", "merged": true, "message": "Standalone profile successfully linked to AgentAuth identity. ..." }

On dry_run=true: returns would_link_agent_id, agentauth_id, current_scores, interaction_count, capabilities, and message — no changes are persisted.

Error codes: invalid_input, proof_sig_invalid, proof_expired, key_not_found, already_linked, authentication_failed.

verify_link_proof

Auth: required (AgentAuth token)

Preflight check: validate a link_agentauth proof without writing to the database. Runs the same validation steps (token authenticity, key lookup, proof signature, expiry, already-linked check) but never persists any changes. Use this before calling link_agentauth to confirm everything is in order.

verify_link_proof(

access_token="eyJ...", public_key_hex="a1b2c3...", signed_proof="eyJ..." )

Response:

{

"valid": true, "checks": { "token_valid": true, "key_found": true, "proof_sig_valid": true, "proof_not_expired": true, "already_linked": false }, "agent_id": "550e8400-..." }

agent_status

Auth: required

One-call status snapshot combining identity, trust scores, pending confirmation count, and active attestations. Useful as a dashboard or health check.

agent_status(access_token="eyJ...")

Response:

{

"agent_id": "550e8400-...", "agentauth_linked": true, "scores": {"overall": 0.73, "reliability": 0.81}, "scopes": ["trust.read", "trust.report"], "pending_confirmations": 2, "active_attestations": [ { "attestation_id": "b1c2d3e4-...", "valid_until": "2026-03-21T12:00:00+00:00", "seconds_remaining": 86400 } ] }

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Trust Scoring

check_trust

Auth: none (authenticated calls with trust.read scope get factor_breakdown)

Primary tool for evaluating an agent before a transaction. Returns a score (0.0-1.0), confidence (0.0-1.0), interaction count, and a plain-language explanation.

check_trust(agent_id="550e8400-...", score_type="reliability")

Response:

{

"agent_id": "550e8400-...", "score_type": "reliability", "score": 0.82, "confidence": 0.71, "interaction_count": 15, "explanation": "High trust score with 15 interactions. Mostly positive.", "computed_at": "2026-03-20T12:00:00+00:00" }

A score of 0.5 with confidence 0.05 means "unknown", not "average". Low confidence means few interactions -- treat with caution.

check_trust_batch

Auth: none

Check trust scores for up to 20 agents in a single call.

check_trust_batch(agent_ids=["uuid-1", "uuid-2", "uuid-3"])

compare_agents

Auth: none

Rank up to 10 agents side-by-side by score.