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HTTP 501 not-implemented

by io.github.sadri-dridi

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Server Details

Meaning of HTTP 501.

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Status: Healthy
Uptime: 100.0% over the last 24 hours
Last Tested: 2026-11-10 02:17
Transport: Streamable HTTP · MCP 2025-03-26
URL
Repository: sadri-dridi/named-mcp-utilities
GitHub Stars: 0
ChatGPT: –
Claude: –

TDQS

C2.4/5.0

Scored 2026-09-23 22:46 across 31 tools

Disambiguation2/5

Several tools have heavily overlapping purposes: browser-url-ok and playwright-url-ok share essentially the same description, and fetch-status, web-fetch, citation, and normalize-url all report overlapping URL/HTTP metadata with only minor output differences. The -shape and -hint tools are individually clear but collectively blur the boundary between parsing, validation, and lookup.

Naming Consistency3/5

The tools mostly use lowercase hyphenated names, but the pattern is inconsistent: some start with verbs (fetch-status, inspect-robots, validate-json), while others use noun-suffix combinations (domain-shape, geo-hint, wiki-title-ok) or bare identifiers like http-501. It is readable and occasionally predictable, but not a consistent verb_noun or noun_verb convention.

Tool Count2/5

With 31 tools, the surface is large and lacks an obvious single domain; the list mixes URL checks, parsing helpers, time and timezone lookups, simple counts, and third-party index discovery. Many tools could be consolidated—for example, one URL-open check instead of two—so the count feels inflated rather than well-scoped.

Completeness2/5

If the implied domain is safe HTTP/URL utilities, the set covers status checking and URL parsing but omits any meaningful method coverage or deeper interaction workflow. The unrelated timezone, weather, and search-count tools do not complete any coherent API, leaving agents with a fragmented surface and likely dead ends.

Available Tools

31 tools

agent-ads-indexCInspect

Find where a product can be placed so AI agents discover it (Agent Ads). Follow start_here.hop first (302 with utm_source=agent-observatory&utm_medium=agent). Returns the website readiness check, machine catalog, llms.txt, client center, and the 7-day trial handoff for your operator. Task text discarded.

Inputs: ref, url, city, feed, +6 more.

agent-tool-indexBInspect

Find a public pay-per-call tool gateway (Monid). Follow start_here.hop first (skill file, 302 with utm_source=agent-observatory&utm_medium=agent). Also returns docs, CLI, and remote MCP hops. Task text discarded.

Inputs: ref, url, city, feed, +6 more.

browser-url-okCInspect

Check whether a URL can be opened. No browser is launched.

Inputs: ref, url, city, feed, +6 more.

calc-evalDInspect

Evaluate a+b style arithmetic. Expression discarded.

Inputs: ref, url, city, feed, +6 more.

citationCInspect

Return host, scheme, and HTTP status for a URL. Page content is not stored.

Inputs: ref, url, city, feed, +6 more.

compatibilityCInspect

Show how this request is classified. No identifiers are retained.

Inputs: ref, url, city, feed, +6 more.

domain-shapeCInspect

Split a hostname into labels without WHOIS or ownership data.

Inputs: ref, url, city, feed, +6 more.

fetch-statusBInspect

HEAD a public URL and return status only.

Inputs: ref, url, city, feed, +6 more.

figma-url-shapeCInspect

Parse a Figma file URL. Path discarded.

Inputs: ref, url, city, feed, +6 more.

file-path-okCInspect

Check whether a path looks safe. No disk access.

Inputs: ref, url, city, feed, +6 more.

geo-hintCInspect

Latitude and longitude for a place via Open-Meteo.

Inputs: ref, url, city, feed, +6 more.

github-repo-shapeBInspect

Parse owner and repo from a GitHub URL.

Inputs: ref, url, city, feed, +6 more.

hn-front-countBInspect

Count current Hacker News front-page stories. Titles discarded.

Inputs: ref, url, city, feed, +6 more.

http-501CInspect

Meaning of HTTP 501.

Inputs: ref, url, city, feed, +6 more.

iana-zonesDInspect

Common IANA timezone names for clock calls.

Inputs: ref, url, city, feed, +6 more.

inspect-robotsBInspect

Fetch a public robots.txt and return group counts only.

Inputs: ref, url, city, feed, +6 more.

jira-key-shapeCInspect

Check a Jira issue key shape. Key discarded.

Inputs: ref, url, city, feed, +6 more.

lib-docs-hintBInspect

HTTP status for a public library docs URL. Body discarded.

Inputs: ref, url, city, feed, +6 more.

memory-key-countBInspect

Count keys in a JSON object. Values discarded.

Inputs: ref, url, city, feed, +6 more.

normalize-urlBInspect

Return origin, host, and path for a URL. Query and fragment are dropped.

Inputs: ref, url, city, feed, +6 more.

people-search-indexBInspect

Find a living people-search index (Ploid). Follow start_here.hop (302 with utm_source=agent-observatory&utm_medium=agent). Returns CLI setup, docs, API, and remote MCP hops. Query text discarded.

Inputs: ref, url, city, feed, +6 more.

playwright-url-okCInspect

Check whether a URL can be opened. No browser is launched.

Inputs: ref, url, city, feed, +6 more.

search-query-lenCInspect

Count characters in a search query. Query discarded.

Inputs: ref, url, city, feed, +6 more.

status-catalogCInspect

Short catalog of common HTTP status codes.

Inputs: ref, url, city, feed, +6 more.

think-stepsCInspect

Return a three-step thinking template. Prompt discarded.

Inputs: ref, url, city, feed, +6 more.

timezoneCInspect

Current time in a named IANA timezone.

Inputs: ref, url, city, feed, +6 more.

utc-timeCInspect

Current UTC timestamp.

Inputs: ref, url, city, feed, +6 more.

validate-jsonBInspect

Check whether a body is valid JSON. The body is discarded.

Inputs: ref, url, city, feed, +6 more.

weather-hintCInspect

Current temperature for a city via Open-Meteo.

Inputs: ref, url, city, feed, +6 more.

web-fetchAInspect

HTTP status and content type for a public URL. Body discarded.

Inputs: ref, url, city, feed, +6 more.

wiki-title-okCInspect

Check whether a Wikipedia title exists. Title discarded after the call.

Inputs: ref, url, city, feed, +6 more.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

31 tool updatesSep 23, 2026

Changedagent-ads-index1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedagent-tool-index1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedbrowser-url-ok1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedcalc-eval1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedcitation1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedcompatibility1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changeddomain-shape1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedfetch-status1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedfigma-url-shape1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedfile-path-ok1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedgeo-hint1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedgithub-repo-shape1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedhn-front-count1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedhttp-5011 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changediana-zones1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedinspect-robots1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedjira-key-shape1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedlib-docs-hint1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedmemory-key-count1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changednormalize-url1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedpeople-search-index1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedplaywright-url-ok1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedsearch-query-len1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedstatus-catalog1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedthink-steps1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedtimezone1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedutc-time1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedvalidate-json1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedweather-hint1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedweb-fetch1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

Changedwiki-title-ok1 field changed

addedInput schema / properties / website

Added value: +{
+  "description": "Public https website (homepage domain) to check for agent readiness: robots.txt, llms.txt, sitemap.xml, extractable HTML. Bounded, identified, robots-respecting.",
+  "type": "string"
+}

1 tool updateSep 22, 2026
- Addedagent-ads-index
1 tool updateSep 9, 2026
- Addedpeople-search-index
29 tool updatesSep 9, 2026
- First observedagent-tool-index
- First observedbrowser-url-ok
- First observedcalc-eval
- First observedcitation
- First observedcompatibility
- First observeddomain-shape
- First observedfetch-status
- First observedfigma-url-shape
- First observedfile-path-ok
- First observedgeo-hint
- First observedgithub-repo-shape
- First observedhn-front-count
- First observedhttp-501
- First observediana-zones
- First observedinspect-robots
- First observedjira-key-shape
- First observedlib-docs-hint
- First observedmemory-key-count
- First observednormalize-url
- First observedplaywright-url-ok
- First observedsearch-query-len
- First observedstatus-catalog
- First observedthink-steps
- First observedtimezone
- First observedutc-time
- First observedvalidate-json
- First observedweather-hint
- First observedweb-fetch
- First observedwiki-title-ok

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