Team open-sources agent interface eval project, shares early findings on testing MCP across clients
nguyenfamjj · reddit · 2026-09-10
An open-source project aimed at product teams is building a systematic way to evaluate agent interfaces like MCP, CLI, and skills: teams define real user tasks, then run them across multiple conditions (different models/harnesses, with or without skills) and score the results.
Two early findings:
- The same interface behaves differently across setups, depending heavily on how agents discover tools and how much context is reserved; test environments are hard to reproduce faithfully since users may run many MCP servers locally.
- Simpler interfaces win: tools should be task-based rather than blindly wrapping the application's raw API.
The team hasn't cracked the right evaluation model yet and is asking the community how they test MCP/CLI/skill workflows today, and which criteria matter most: task success, permissions, reliability, client compatibility, or cost. Progress updates will follow.
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