Sports Rules
https://sports-rules.gumballtools.com/api/mcp ↗
Description
Work an offside call through IFAB Law 11 or NHL Rule 83, step by step.
What our measurements say
Sports Rules is a remote MCP server published at sports-rules.gumballtools.com. It has been probed 16 times since 9/12/2026. It answered in 16 of them (100.0%), a near-uninterrupted record. Median response time is 1,848 ms, a delay an agent will notice. It offers a narrow, focused set of 2 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool names clearly indicate purpose (e.g., 'offside_rule_contrast' for rule comparison).
- Descriptions specify use cases (e.g., 'when someone asks how the two compare').
Weaknesses
- Parameters like 'foremostPart' and 'involvement' lack context for valid values.
- No explicit error handling for missing required parameters (e.g., 'sport' is required but no validation guidance).
offside— Parameters like 'deliberatePlayCriteriaMet' (array) and 'situation' (string) lack examples or constraints.offside_rule_contrast— No parameters listed, but description implies it should return structured comparisons without defining output format.
Verdict
Event narrative
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Schema 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 passed · last run:
- Cold-start: cold 181ms → warm 175ms (penalty 6ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
offsideWork an offside call through the published decision procedure — association football under IFAB Law 11, or ice hockey under NHL Rule 83 — and return every step, not just the verdict. Use this for any "was that offside" question in either sport. The two rules are structurally OPPOSITE and are routinely conflated, and there are four specific things that get answered wrong: SOCCER: 1. HANDS AND ARMS DO NOT COUNT, for anyone including goalkeepers. Only parts that could legally score are measured, and the boundary is the bottom of the armpit. This tool REFUSES to compute from an arm position rather than guessing where the shoulder was. 2. AN OFFSIDE POSITION IS NOT AN OFFENCE. It becomes one only with involvement in active play. Do not report "he was offside" when the answer is that he was in
sportstringrequiredattackernumberballnumbersecondLastDefendernumberforemostPartstringrestartstringinOwnHalfbooleaninvolvementstringlastTouchstringdeliberatePlayCriteriaMetarrayrearSkatenumberskateOnIcebooleansituationstringsticknumber
offside_rule_contrastReturn the structural differences between soccer offside and hockey offside, dimension by dimension. Use this when someone asks how the two compare, or when you are about to reason about one sport using an intuition from the other — which is the commonest way to get either wrong. They differ on what part of the player is measured, when the picture freezes, whether position alone is an offence, what happens at exactly level, what resets the situation, and which restarts are exempt. Takes no arguments. Returns the comparison table.
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Dual-era
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