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PopNx MCPMCP servers for people who use AI · explained in plain words

Rubrkit

by liberat0rversion 1.0.0i★ –iRuns in the cloud
Registry namecom.rubrkit/rubrkit

Install

Overview

Description from the maker (original English)

MCP-native AI evaluation: rubric audits, eval suites, and proof reports for AI/LLM output.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

  • Connection: Runs in the cloud
  • Transport: Streamable HTTP
  • Category: Search & AI memory

Install

Pick the AI app you use, then copy the settings.

Before you install

  • Basic checks: 3 of 3 passed
  • Runs on the maker’s server: what you ask it goes through their server.
  • Can do 41 things (tools) rubrkit_search_api_docs, rubrkit_read_api_doc, rubrkit_read_openapi_contract, rubrkit_create_artifact_bundle …
  • The registry lists no key to fill in.

You need

Which app do you use?

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

  1. Open Settings → Connectors
  2. Press Add custom connector
  3. Paste the address below and press Add
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Add2https://…3
https://www.rubrkit.com/api/v1/mcp

Run this in your terminal

claude mcp add --transport http rubrkit https://www.rubrkit.com/api/v1/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "rubrkit": {
      "url": "https://www.rubrkit.com/api/v1/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "rubrkit": {
      "type": "http",
      "url": "https://www.rubrkit.com/api/v1/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

  1. Open ChatGPT on the web → Settings → Connectors (Apps)
  2. Press Create or Add (some plans need Developer mode under Advanced first)
  3. Paste the address below, give it a name and save
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Create2https://…3
https://www.rubrkit.com/api/v1/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Tool names and descriptions exactly as the server reported them on Nov 10, 2026. The maker wrote them, not us; we show them as plain text.

  • rubrkit_search_api_docs

    Search the canonical docs/api Markdown guides and OpenAPI operation summaries.

  • rubrkit_read_api_doc

    Read a docs/api Markdown guide or OpenAPI source by slug, file name, or docs/api path.

  • rubrkit_read_openapi_contract

    Read the canonical docs/api/openapi.yaml contract.

  • rubrkit_create_artifact_bundle

    Create an artifact bundle through /api/v1/artifact-bundles. Requires artifact_bundles:write for API keys.

  • rubrkit_list_artifact_bundles

    List artifact bundles through /api/v1/artifact-bundles. Requires artifact_bundles:read for API keys.

  • rubrkit_read_artifact_bundle

    Read artifact bundle details, files, and file tree. Requires artifact_bundles:read for API keys.

  • rubrkit_delete_artifact_bundle

    Archive an artifact bundle (soft delete) through DELETE /api/v1/artifact-bundles/{artifactBundleId}. The bundle moves to the archived state and can be restored or permanently deleted later. Requires artifact_bundles:write for API keys.

  • rubrkit_hard_delete_artifact_bundle

    Permanently delete an archived artifact bundle and all of its files, versions, and run history through DELETE /api/v1/artifact-bundles/{artifactBundleId}/permanent. This is irreversible and only works on bundles that are already archived. Requires artifact_bundles:write for API k

  • rubrkit_upload_artifact_files

    Upload one or more text files into an artifact bundle. Requires files:write for API keys.

  • rubrkit_list_artifact_files

    List files in an artifact bundle. Requires files:read for API keys.

  • rubrkit_read_artifact_file

    Read the latest file metadata and content. Requires files:read for API keys.

  • rubrkit_update_artifact_file

    Write a new editable version for a file. Requires files:write for API keys.

  • rubrkit_compact_artifact_file

    Shorten a markdown or text prompt without losing instructions. mode standard (default) is a free deterministic pass that saves a new version unless dryRun is true; requires files:write for API keys. mode deep starts an AI compaction job that uses credits, verifies every instructi

  • rubrkit_estimate_deep_compaction

    Estimate the credit cost of a deep compaction of one file before starting it. Requires compactions:run for API keys.

  • rubrkit_apply_deep_compaction

    Save a succeeded deep compaction job's verified result as a new version of the file. Refused if the file changed since the job started. Requires files:write for API keys.

  • rubrkit_start_audit

    Start an async audit job. Audit results are cached per account by a content hash of their inputs; pass force: true to bypass the cache and run a fresh audit (the same as the CLI's --no-cache flag). Requires audits:run for API keys.

  • rubrkit_list_audits

    List persisted audit history. Requires artifact_bundles:read for API keys.

  • rubrkit_read_audit

    Read a single audit run. Requires artifact_bundles:read for API keys.

  • rubrkit_apply_audit_rewrite

    Apply a completed audit's AI rewrite to the bundle files (a new version per changed file). Requires audits:run for API keys.

  • rubrkit_poll_job

    Read async job progress. Requires jobs:read for API keys.

  • rubrkit_list_job_events

    Read append-only job progress events. Requires jobs:read for API keys.

  • rubrkit_list_artifact_bundle_versions

    List bundle-level version events. Requires artifact_bundles:read for API keys.

  • rubrkit_restore_artifact_bundle_version

    Restore files from a prior artifact-bundle version by creating new file versions. Requires artifact_bundles:write and files:write for API keys.

  • rubrkit_list_file_versions

    List immutable versions for a file. Requires files:read for API keys.

  • rubrkit_restore_file_version

    Restore a prior file version by creating a new version. Requires files:write for API keys.

  • rubrkit_run_evals

    Start an async eval run. Requires evals:run for API keys. Set mode: "advanced" with baselineVersionId and candidateVersionId to run a statistically-backed A/B (repeats defaults to 3, max 5).

  • rubrkit_list_evals

    List eval history. Requires artifact_bundles:read for API keys.

  • rubrkit_read_eval

    Read one eval run, including the `stats` statistical verdict on advanced-mode runs (empty for standard runs). Requires artifact_bundles:read for API keys.

  • rubrkit_export_proof_report

    Start an async proof report job with export storage enabled by default. Requires evals:run for API keys.

  • rubrkit_read_proof_report

    Read one proof report. Requires artifact_bundles:read for API keys.

  • rubrkit_list_golden_cases

    List the golden cases for an artifact bundle via /api/v1/artifact-bundles/{artifactBundleId}/golden-cases. Requires artifact_bundles:read (or artifacts:pull) for API keys.

  • rubrkit_add_golden_case

    Add a golden case (a real edge-case input with a confirmed-correct output) to an artifact bundle via POST /api/v1/artifact-bundles/{artifactBundleId}/golden-cases. Requires artifact_bundles:write for API keys.

  • rubrkit_retire_golden_case

    Retire a golden case via DELETE /api/v1/golden-cases/{goldenCaseId}. Requires artifact_bundles:write for API keys.

  • rubrkit_create_drift_monitor

    Create a drift monitor pinned to a file version via POST /api/v1/artifact-bundles/{artifactBundleId}/drift-monitors. Requires artifact_bundles:write for API keys.

  • rubrkit_list_drift_monitors

    List the drift monitors for an artifact bundle via /api/v1/artifact-bundles/{artifactBundleId}/drift-monitors. Requires artifact_bundles:read (or artifacts:pull) for API keys.

  • rubrkit_read_drift_observations

    List the recorded observations for a drift monitor via /api/v1/drift-monitors/{driftMonitorId}/observations. Requires artifact_bundles:read (or artifacts:pull) for API keys.

  • rubrkit_run_drift_check

    Queue a drift check immediately instead of waiting for the monitor's schedule, via POST /api/v1/drift-monitors/{driftMonitorId}/check. The first check on a new monitor calibrates its baseline. Costs one audit per repeat. Requires artifact_bundles:write for API keys.

  • rubrkit_set_drift_monitor_status

    Pause or resume a drift monitor via PATCH /api/v1/drift-monitors/{driftMonitorId}. Requires artifact_bundles:write for API keys.

  • rubrkit_record_outcome

    Record a production outcome event (input feature, metric, and/or label) for an artifact bundle via POST /api/v1/artifact-bundles/{artifactBundleId}/outcomes. Requires artifact_bundles:write for API keys.

  • rubrkit_read_input_drift

    Compare recent production inputs against a prior reference window (population stability index) for an artifact bundle via GET /api/v1/artifact-bundles/{artifactBundleId}/drift/input. Requires artifact_bundles:read (or artifacts:pull) for API keys.

  • rubrkit_read_validity_drift

    Correlate rubric scores against recorded outcome metrics for an artifact bundle to check whether the rubric is still predictive via GET /api/v1/artifact-bundles/{artifactBundleId}/drift/validity. Requires artifact_bundles:read (or artifacts:pull) for API keys.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 10, 2026

  • ✓ Pass

    Maker matches the repo

    The registry name was verified against the domain rubrkit.com (the registry checks domain ownership)

  • … Not checked yet

    Still maintained

    We have not read this repo from GitHub yet

  • … Not checked yet

    Has a licence

    We have not read this repo from GitHub yet

  • ✓ Pass

    Endpoint responds

    Responded in 350 ms (HTTP 200)

  • – Not applicable

    Sign-in with OAuth

    No sign-in needed

  • ✓ Pass

    No hidden instructions in tool descriptions

    Read 41 tool descriptions and found no hidden instructions to the AI

Compared with others in Search & AI memoryi

  • More stars than 0% of the other 5850 servers in this category
  • Published to the registry more recently than 19% of the other 5850 servers in this category
  • Basic checks equal to or better than 100% of the other 5850 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Rubrkit safe?

It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 4 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Context7, Codebase Memory, Exa

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Context7

Feeds AI the latest docs for libraries and frameworks before it answers, so code it writes does not use outdated, removed functions.

by upstashWidely used↓ 972.7K/wk★ 64.2KUpdated yesterday

Computer or cloud

Codebase Memory

Codebase knowledge graph for AI agents — 162 languages, sub-ms queries, 99% fewer tokens.

by DeusDataWidely used↓ 18K/wk★ 48.1KUpdated 24 days ago

Runs on your computer

Exa

Connect AI agents to Exa for web search, content fetching, and multi-step research.

by exa-labsWidely used★ 5.2KUpdated 2 months ago

Runs in the cloud✓ exa.ai

README from the maker

No README found in the repo

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