MCP Needs Verification, Not Just Execution
asadlambdatest · reddit · 2026-07-15
The author argues that while most MCP servers continuously provide agents with more action capabilities, they rarely offer verification capabilities.
Core Problem
- After an agent calls a tool, it typically only receives a "tool executed successfully" return value.
- However, "tool returns 200" does not mean "the user's desired outcome actually happened".
- For example: an agent modifies a web app, deems the task complete, but the login flow might actually be broken.
Author's Perspective
He believes what's missing isn't another action tool, but a verification tool:
- Lets the agent run the actual process again after execution;
- Returns ground truth that it couldn't fabricate itself;
- Uses pass/fail to distinguish between "self-proclaimed success" and "actual success".
Closing Question
The author asks the community if anyone is building this "verification stack". He feels the ecosystem is too biased towards "enhancing agent capabilities" while neglecting mechanisms that "let agents discover they were wrong".
Related event: AI agents in production: don’t trust narration, verify outcomes(8 posts)→
More from coding & agent
- BELL: Open-Source Stack Combines Browserbase, Eve, iMessage and Stripe Link for Personal Agents — jeff_weinstein · 2026-10-27
- Two engineers rebuilt a FedEx supplier's billing core in 3.5 months vs an estimated 7-8 — alex_verem · 2026-10-27
- GPT-6.1 Terra gains ~20 points on Terminal-Bench 4.0, rivalling GPT-6.1 Sol — ArtificialAnlys · 2026-10-27
- GPT-6.1 Terra scores 48 on AA Coding Agent Index at one-third the cost of GPT-5.6 Terra — ArtificialAnlys · 2026-10-27
- Shift-1 router cuts coding agent spend up to 55% while keeping SWE-bench accuracy — ypatil125 · 2026-10-27
- Non-coder vibe-codes a Godot JRPG with Claude Code in two weeks, music and art synced — ADHDavid · 2026-10-27