Find US BJJ gyms with weekly schedules, open mats, and visitor drop-in prices.
Scored across 4 tools
Each tool has a distinct role: find_gyms searches for gyms, get_gym retrieves a single gym's full details, list_cities shows coverage, and map_url generates a map link. There is no meaningful overlap between these tools.
Three tools clearly follow a verb_noun pattern: find_gyms, get_gym, list_cities. map_url is less clear as an action and could read as a noun phrase instead of a verb command, but it is still short and snake_case, so the overall style remains consistent.
Four tools is exactly right for this narrow read-only locator domain. Each tool covers a necessary step in the workflow: checking coverage, searching, viewing details, and sharing a map link.
The core read-only workflow is well covered: coverage discovery, gym search, gym details, and map links. Minor gaps exist, such as no direct way to list all gyms in a state or search by gym name directly, but agents can work around these using the existing tools.
Find BJJ gyms near a US city, neighborhood, or ZIP. Defaults match the OpenMapp map: open to drop-ins, classes today. Returns drop-in policy, visitor fee when known, matching class times, and online booking (reservePrice, reserveUrl) when the gym takes reservations.
| Name | Required | Description | Default |
|---|---|---|---|
| q | Yes | City, neighborhood, address, or ZIP, same as the OpenMapp search box | |
| day | No | Restrict to this weekday or tomorrow. Overrides today | |
| kinds | No | Filter to Gi, No-Gi, and/or open mat | |
| limit | No | Max gyms to return. Default 8 | |
| today | No | Only gyms with a listed class or open mat today. Default true | |
| drop_ins | No | Only gyms marked Drop-ins (known welcome or a listed visitor/open-mat price). Default true |
Full public gym card: address, drop-in policy, visitor fee, the weekly timetable, and online booking when the gym takes reservations (price and reserveUrl per class). Use an id or slug from find_gyms.
| Name | Required | Description | Default |
|---|---|---|---|
| id | Yes | Gym id or slug from find_gyms, e.g. 10th-planet-allentown |
US cities OpenMapp covers, with gym counts, how many welcome class drop-ins, and how many list an open mat. Use this to check coverage before find_gyms. Filter by city name or two-letter state.
| Name | Required | Description | Default |
|---|---|---|---|
| q | No | Filter by city name, e.g. Austin | |
| limit | No | Max cities to return. Default all matching, max 500 | |
| state | No | Two-letter US state, e.g. TX |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the disclosure burden and does convey the main behavior: it lists cities with coverage counts and supports filtering by name or state. However, it does not specify defaults, ordering, or response shape, so an agent still has some uncertainty about exact behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two tight sentences front-load the resource, the data returned, and the intended use case, with filtering hinted at the end. Every sentence earns its place.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple list tool with fully documented parameters and no output schema, the description is nearly sufficient: it states the resource, data, purpose, and filter options. Only the exact return shape and default behavior are left implicit, and those are minor given the simplicity.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The schema already documents all three parameters at 100% coverage, so the baseline is 3. The description adds little beyond the schema, restating the q and state filters without new format or interaction details.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
States a specific action (list) on a specific resource (US cities covered by OpenMapp) and enumerates the data returned (gym counts, drop-in and open-mat availability). It also names the sibling find_gyms, making it distinguishable from the other tools.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Explicitly positions the tool as a pre-flight check: 'Use this to check coverage before find_gyms.' This gives an agent a clear decision rule for when to invoke it and which alternative to reach for instead.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
OpenMapp map link for a city search, optionally with a gym drawer already open.
| Name | Required | Description | Default |
|---|---|---|---|
| q | Yes | City or search text for the map search box | |
| gym_id | No | Gym id from find_gyms to open the details drawer |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description must disclose behavioral traits. It implies the output is a URL ('map link') but does not explicitly state the return type, whether the operation is read-only, or any side effects. For a tool that likely just constructs a URL, the lack of explicit behavioral disclosure is a gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, compact sentence that front-loads the core purpose ('OpenMapp map link'). It contains no unnecessary words or redundancy, though it could benefit from slightly more specificity about usage.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (two params, no output schema), the description is adequate but not fully complete. It lacks explicit usage guidance and behavioral transparency, which are needed to help an agent decide when to call this tool and what to expect. However, the schema and the tool's straightforward nature partially compensate.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so both q and gym_id are already documented in the schema. The description adds no additional semantic value beyond loosely mirroring the schema (city search ~ q, gym drawer ~ gym_id). Since the schema covers everything, the baseline of 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool generates an 'OpenMapp map link' for a city search, optionally with a gym drawer open. The verb and resource are specific, and the mention of 'city search' distinguishes it from sibling tools like find_gyms or get_gym, though it does not explicitly name them.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
There is no guidance on when to use this tool versus alternatives. The description does not mention that it should be used to obtain a shareable URL, nor does it indicate that find_gyms should be used first to get gym_id. The schema notes gym_id comes from find_gyms, but the description itself provides no usage context or exclusions.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
find_gyms1 field changedInput schema / properties / drop_ins / descriptionPrevious value: -"Only gyms that do not refuse class drop-ins. Default true"New value: +"Only gyms marked Drop-ins (known welcome or a listed visitor/open-mat price). Default true"find_gymsget_gymlist_citiesmap_urlBJJ and grappling gyms worldwide, plus upcoming competitions. Free, read-only.
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