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Is ZeroWidth Caliper reliable?

Being measured Measurement in progress: 1 check(s) so far. A verdict needs at least 3 checks.

En français : Mesure en cours. Faceabot teste cet outil lui-même, en continu, sans dépendre de ce que son auteur affirme.

What it does

Build datasets and rubrics, then run evals that score your AI in Caliper.

Source: official MCP registry (registry.modelcontextprotocol.io) · version 1.0.0 · publisher website
Connect your agent
{
  "mcpServers": {
    "caliper": {
      "url": "https://api.zerowidth.ai/mcp/x/caliper"
    }
  }
}
Or ask Faceabot first: MCP tool check_reliability {"id":"ai.zerowidth/caliper"} on https://faceabot.com/api/mcp.
Does it actually do the job?

Real task being tested — Faceabot asked caliper_datasets_list to do a small read-only task 1 time(s): 0 returned a real result. Last result: tool_error (the tool answered with an error for the neutral sample input) in 2473 ms.

Sample input: {}. A success means a non-empty result without error; it does not certify the accuracy or safety of the content.
Faceabot measurements
WhenAnswersReal taskLatency
2026-10-07 14:31 UTC✅ ok❌ tool_error9962 ms
Method: MCP initialize then tools/list from Faceabot (FaceabotProbe/1.0), plus one read-only tool call with a neutral input when the server declares one, repeated over time. This checks that the server is up and speaks MCP correctly; it does not certify the quality or safety of each tool. How measurement works.

More from the same publisher

ZeroWidth Compass Being measured · 100% over 1 checks Real task being tested · 0/1

Read and update your Compass map: pages, changes, opportunities and interviews.

MCP endpoint : https://api.zerowidth.ai/mcp/x/compass · website · measurements and details
ZeroWidth Ledger Being measured · 100% over 1 checks Real task being tested · 0/1

Log decisions with expectations, add evidence, and track metrics in Ledger.

MCP endpoint : https://api.zerowidth.ai/mcp/x/ledger · website · measurements and details
ZeroWidth Napkin Being measured · 100% over 1 checks Real task being tested · 1/1

Draw boards, write docs and sheets, and build decks with your brand in Napkin.

MCP endpoint : https://api.zerowidth.ai/mcp/x/napkin · website · measurements and details
ZeroWidth Prism Being measured · 100% over 1 checks Real task being tested · 1/1

Explore ideas in Prism fields, run studies, and read research findings.

MCP endpoint : https://api.zerowidth.ai/mcp/x/prism · website · measurements and details
ZeroWidth Workbench Being measured · 100% over 1 checks Real task being tested · 1/1

Build, run and publish Workbench flows, tasks, shims and knowledge bases.

MCP endpoint : https://api.zerowidth.ai/mcp/x/workbench · website · measurements and details

Find tools similar to ZeroWidth Caliper →

Publisher of ZeroWidth Caliper?

Show your measured reliability on your README or website:

Faceabot reliability badge for ZeroWidth Caliper

[![Measured by Faceabot](https://faceabot.com/badge/ai.zerowidth/caliper.svg)](https://faceabot.com/tools/ai.zerowidth/caliper)
Data in JSON: /api/catalog?id=ai.zerowidth/caliper · Stop probes: POST /api/reliability/opt-out

AI agents: all of this is available without keys over MCP https://faceabot.com/api/mcp · HTTP https://faceabot.com/api/catalog?q=… · Guide : llms.txt

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