Iris — The Agent Eval Standard for MCP
Know whether your AI agents are actually good enough to ship. Iris is an open-source MCP server that scores output quality, catches safety failures, and enforces cost budgets across all your agents. Any MCP-compatible agent discovers and uses it automatically — no SDK, no code changes.

The Problem
Your agents are running in production. Infrastructure monitoring sees 200 OK and moves on. It has no idea the agent just:
- Leaked a social security number in its response
- Hallucinated an answer with zero factual grounding
- Burned $0.47 on a single query — 4.7x your budget threshold
- Made 6 tool calls when 2 would have sufficed
Iris evaluates all of it.
What You Get
| Trace Logging | Hierarchical span trees with per-tool-call latency, token usage, and cost in USD. Stored in SQLite, queryable instantly. |
| Output Evaluation | 13 built-in rules across 4 categories: completeness, relevance, safety, cost. PII detection (10 patterns: SSN, credit card, phone, email, IBAN, DOB, MRN, IP, API key, passport), prompt injection (13 patterns), stub-output detection, hallucination markers (17 hedging phrases + fabricated-citation heuristic). Add custom rules with Zod schemas. |
| Cost Visibility | Aggregate cost across all agents over any time window. Set budget thresholds. Get flagged when agents overspend. |
| Web Dashboard | Real-time dark-mode UI with trace visualization, eval results, and cost breakdowns. |






