Browser URL Check
https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/browser-url-ok/mcp ↗
Description
Check whether a URL can be opened. No browser is launched.
What our measurements say
Browser URL Check is a remote MCP server published at agent-observatory-sensor.nolimit-observatory.workers.dev. It has been probed 6 times since 9/12/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 39 ms, placing it among the faster endpoints. It exposes a broad tool surface of 30 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Some tools have clear, specific purposes (e.g., 'validate-json', 'normalize-url').
Weaknesses
- Tool names are ambiguous or redundant (e.g., 'browser-url-ok' vs. 'playwright-url-ok').
- Descriptions often fail to explain use cases, only stating functionality.
- All parameters are optional with no guidance on required inputs.
- High overlap between tools (e.g., multiple URL validation tools).
- No error handling or constraint documentation.
browser-url-ok— Duplicate tool name with 'playwright-url-ok'; unclear distinction.utc-time— Vague description provides no context for when to use it.timezone— Parameter 'zone' is ambiguous without examples or constraints.validate-json— No explanation of validation rules or error formats.
Verdict
Event narrative
Sign up free to generateSchema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 37ms → warm 35ms (penalty 2ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
browser-url-okCheck whether a URL can be opened. No browser is launched.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
utc-timeCurrent UTC timestamp.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
timezoneCurrent time in a named IANA timezone.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
validate-jsonCheck whether a body is valid JSON. The body is discarded.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
normalize-urlReturn origin, host, and path for a URL. Query and fragment are dropped.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
inspect-robotsFetch a public robots.txt and return group counts only.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
domain-shapeSplit a hostname into labels without WHOIS or ownership data.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
citationReturn host, scheme, and HTTP status for a URL. Page content is not stored.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
compatibilityShow how this request is classified. No identifiers are retained.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
status-catalogShort catalog of common HTTP status codes.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
iana-zonesCommon IANA timezone names for clock calls.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
web-fetchHTTP status and content type for a public URL. Body discarded.
zonestringjsonstringurlstringhoststringcitystringquerystringpathstringrefstringfeedstring
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Legacy
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[](https://mcpmetrics.io/servers/io-github-sadri-dridi-browser-url-ok)<a href="https://mcpmetrics.io/servers/io-github-sadri-dridi-browser-url-ok"><img src="https://mcpmetrics.io/badge/io.github.sadri-dridi/browser-url-ok/era.svg" alt="mcpmetrics"></a>You are seeing the last 7 days. Sign up for the full history. Which check failed and why is in the dashboard.
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