Observed arrival · 2026-08-31
MCP Tuner Tests the Prompts Hidden in Tool Descriptions
A deterministic auditor and transparent proxy for checking MCP server metadata, schemas, and wire traffic.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
Field notes
The audit mode evaluates MCP tool, prompt, and resource metadata against a 28-rule catalog over stdio or Streamable HTTP, with non-zero exits for Critical or High failures so results can gate a build. The displayed fleet scan covers five servers and estimates tool-list size using characters divided by four. A separate observe mode acts as a transparent JSON-RPC proxy, forwarding bytes unchanged while scrubbing secrets from JSONL logs.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue