Overwing
by FastDrop
Guardrails for LLM output: pass / fail / review verdicts with calibrated confidence in under 500 ms.
Guardrails for LLM output: pass / fail / review verdicts with calibrated confidence in under 500 ms. Official MCP Registry: ai.overwing/mcp@0.3.0. Package/stdio server - no remote endpoint to probe.
Problem it solves
Discoverable MCP server listed in the official MCP Registry.
How it's different
Package server from the official registry (no remote probe).
Ingested from the official MCP Registry
FastDrop pulled this entry from the official MCP Registry as ai.overwing/mcp and probed the endpoint. The maker did not submit it, so the outbound link is not endorsed
and the description is not theirs.
If this is your server, claim the listing to edit it and take ownership. The registry index lists everything else still awaiting a probe.
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Read directly from the endpoint on 13 Oct 2026. Not supplied by the maker.
evaluateWorks with no API key: 10 evaluations a day, inputs up to 2,000 characters, and the text is not stored. With a key: 250 a day and up, inputs up to 100,000 characters, and your own rule sets. Score any
evaluate_batchScore up to 50 texts against one rule set in a single call. Each item counts as one evaluation. Returns a summary plus per-item verdicts; items can fail independently. Needs an organization key.
list_rule_setsList the prebuilt and custom rule sets available to this organization. Needs an organization key.
get_rule_setFetch a rule set with its full rule definitions. Use 'content-safety' as a worked example when writing your own. Needs an organization key.
create_rule_setCreate a custom rule set with 1 to 25 rules. Each rule is a choice (pick one option), score (position on an ordered scale), or noul (yes/no) question with a fail condition, optional review threshold,
get_evaluationFetch a stored evaluation by id, including the original input and per-rule results. Needs an organization key.
list_evaluationsList recent evaluations, newest first, with optional verdict and rule set filters. Use next_cursor to page. Needs an organization key.
get_usageDaily usage, remaining quota for today, and plan limits. Needs an organization key.
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