Chiark — Agent Quality Index

# Chiark > Cross-protocol quality index for AI agent services. Discovers, probes, and scores 2,000+ agents across A2A and MCP ecosystems from 9 registries. Chiark measures the operational reliability of deployed AI agent endpoints — availability, protocol conformance, and performance — through automated three-tier probing every 30 minutes. It is the independent quality layer for agent-to-agent routing. Live at https://chiark.ai ## API The REST API is at `https://chiark.ai/api/v1`. All responses are JSON. No authentication required. - [API Documentation](https://chiark.ai/docs): Interactive OpenAPI/Swagger docs - [OpenAPI Spec](https://chiark.ai/openapi.json): Machine-readable API schema - [Full API Reference](https://chiark.ai/llms-full.txt): Complete endpoint documentation ### Discover Agents (recommended for routing) Find agents matching quality constraints, optionally filtered by task description: ``` GET /api/v1/discover?task=web+scraping&min_uptime=0.9&protocol=mcp&page_size=3 GET /api/v1/discover?min_score=80&protocol=mcp (constraint-only, no task required) GET /api/v1/discover?payment_enabled=true (all payment-enabled agents) ``` Response: ```json { "agents": [ { "id": "uuid", "name": "Agent Name", "operational_score": 87, "max_score": 100, "uptime_30d": 0.99, "p95_latency_ms": 245, "conformance": "pass", "protocol": "mcp", "endpoint_url": "https://...", "categories": ["Developer Tools"] } ], "total": 42 } ``` ### Check Agent Status ``` GET /api/v1/agents/{id}/status ``` Response: ```json { "agent_id": "uuid", "status": "operational", "is_alive": true, "http_status": 200, "response_time_ms": 145.2, "tls_valid": true, "probe_tier": 3, "timestamp": "2026-03-26T12:00:00Z" } ``` Status values: `operational`, `degraded`, `reachable`, `offline`, `auth_required`, `unknown` ### Get Agent Capabilities ``` GET /api/v1/agents/{id}/capab

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