Garmin Open MCP

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Server Quality Checklist

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Latest release: v0.1.0
Disambiguation5/5
Each tool targets a distinct resource or operation: connection status, sync, day summary, sleep, activities list/get, training status, body metrics, trends, period comparison, and recent overview. Even the cached-data tools are clearly separated by their analytical purpose.
Naming Consistency5/5
All tools follow a consistent garmin_ prefix with a verb_noun structure (check, sync, get, list). The naming pattern is uniform and predictable, making it easy to infer what each tool does.
Tool Count5/5
At 11 tools, the server is well-scoped for a health-data integration. It covers core data access, activity management, analytics, and connection handling without unnecessary bloat or gaps.
Completeness4/5
The surface covers major Garmin data domains: daily summary, sleep, activities, body metrics, training status, and cached data analysis. Minor gaps exist (e.g., no explicit hydration or intraday detail endpoints), but the core workflows are complete.
Average 3.7/5 across 11 of 11 tools scored. Lowest: 3.1/5.
See the Tool Scores section below for per-tool breakdowns.
- No community issues in the last 6 months
- 5 commits in the last 12 weeks
- No stable releases found
- No critical vulnerability alerts
- No high-severity vulnerability alerts
- No code scanning findings
- CI is passing
This repository is licensed under MIT License.
This repository includes a README.md file.
No tool usage detected in the last 30 days. Usage tracking helps demonstrate server value.
Tip: use the "Try in Browser" feature on the server page to seed initial usage.
Add a glama.json file to provide metadata about your server.
If you are the author, simply .
If the server belongs to an organization, first add glama.json to the root of your repository:
```
{
  "$schema": "https://glama.ai/mcp/schemas/server.json",
  "maintainers": [
    "your-github-username"
  ]
}
```
Then . Browse examples.
Add related servers to improve discoverability.

How to sync the server with GitHub?

Servers are automatically synced at least once per day, but you can also sync manually at any time to instantly update the server profile.

To manually sync the server, click the "Sync Server" button in the MCP server admin interface.

How is the quality score calculated?

The overall quality score combines two components: Tool Definition Quality (70%) and Server Coherence (30%).

Tool Definition Quality measures how well each tool describes itself to AI agents. Every tool is scored 1–5 across six dimensions: Purpose Clarity (25%), Usage Guidelines (20%), Behavioral Transparency (20%), Parameter Semantics (15%), Conciseness & Structure (10%), and Contextual Completeness (10%). The server-level definition quality score is calculated as 60% mean TDQS + 40% minimum TDQS, so a single poorly described tool pulls the score down.

Server Coherence evaluates how well the tools work together as a set, scoring four dimensions equally: Disambiguation (can agents tell tools apart?), Naming Consistency, Tool Count Appropriateness, and Completeness (are there gaps in the tool surface?).

Tiers are derived from the overall score: A (≥3.5), B (≥3.0), C (≥2.0), D (≥1.0), F (<1.0). B and above is considered passing.

Tool Scores

Behavior3/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the tool's safety profile. The description adds the date-range scope and clarifies data type but does not disclose additional behaviors like caching, rate limits, or data freshness. Some context is added, but not substantially beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single concise sentence of 11 words, front-loaded with the action and resource type. There is no redundancy or filler, and the structure is optimal for a simple read operation.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The tool has 3 parameters and an output schema, and annotations cover safety. The description is adequate for the core purpose but omits usage guidelines, the refresh parameter's meaning, and any differentiation from sibling tools. These gaps make it minimally complete for effective tool invocation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, and the description only implies a date range via 'for a date range'. It does not explain the required start_date and end_date parameters or the optional refresh parameter, which remains ambiguous. The description fails to compensate for the lack of schema descriptions, leaving parameter meaning largely undisclosed.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb 'get' and the resource 'body composition and blood-pressure data' with a date-range scope. This distinguishes it from sibling Garmin tools like sleep or activity retrieval, though it does not explicitly name alternatives. Purpose is specific, but sibling differentiation is implicit rather than explicit.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides no guidance on when to use this tool versus alternatives such as garmin_get_day or garmin_get_trends. It only states what the tool does, with no mention of use cases, exclusions, or preferred scenarios. This leaves the agent without clear decision support for tool selection.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior4/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior. The description adds the behavioral trait that data is 'cached', implying it may not be live and could require a sync via garmin_sync, which is valuable context beyond the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, front-loaded sentence that efficiently conveys the core purpose. No unnecessary words or repetition, and every phrase adds meaning.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
While the description is brief, it covers the basic function for a simple read-only tool with rich annotations and an output schema. However, it does not clarify what 'cached' means in practice (e.g., staleness, sync implications) or how the response combines trends and activities, leaving some contextual gaps.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, and the description only loosely references 'most recent number of days' without explaining that the 'days' parameter controls the window or that it defaults to 7. For a single optional parameter, the description does not sufficiently compensate for the lack of schema documentation.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb 'Return' and resource 'cached trends and activities' with a time scope of 'most recent number of days'. It distinguishes from siblings like garmin_get_trends and garmin_list_activities by indicating a combined overview of both trends and activities, though it does not explicitly name alternatives.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
There is no explicit guidance on when to use this tool versus siblings. The description only states what it returns, but does not mention when to prefer this over garmin_get_trends or garmin_list_activities, nor any exclusions or prerequisites.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior4/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds meaningful behavioral context beyond the annotations by specifying that the tool operates on 'locally cached' data (no live fetch) and computes 'daily averages' (aggregation behavior). The annotations already cover read-only, idempotent, and non-destructive traits, so this additional cache/aggregation context earns a 4.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, front-loaded sentence with no wasted words. It efficiently communicates the core function and key constraint, earning a perfect score for conciseness.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Considering the moderate complexity (4 params, output schema present, strong annotations), the description is minimally adequate. It covers the purpose and a key behavioral constraint, but lacks usage guidance and parameter detail. The output schema and annotations reduce the burden, so a 3 is appropriate.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
With 0% schema description coverage, the description must compensate. It does clarify that there are 'two date ranges', which maps to the four parameters, but it does not explain parameter formats, inclusion/exclusion semantics, or date syntax. Param names are somewhat self-explanatory, but the description adds minimal depth beyond that.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a specific verb ('Compare') and a clear resource ('daily averages for two locally cached date ranges'), making the tool's function immediately understandable. It also distinguishes itself from sibling tools like garmin_get_day and garmin_get_trends by focusing on comparison rather than retrieval.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
No explicit guidance is provided on when to use this tool versus alternatives. The phrase 'locally cached' hints at a prerequisite but does not explain when comparison is appropriate or how it relates to other Garmin tools. There are no exclusions or alternative recommendations.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior4/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already disclose read-only, idempotent, non-destructive behavior. The description adds meaningful context that the tool operates on locally cached data, which implies the results may be stale until a sync occurs—beyond what annotations say. This helps the agent set expectations about data freshness.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
One clean, front-loaded sentence with no filler. It efficiently conveys the core operation and data source.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple read-only tool with an output schema and strong annotations, the description is adequate but incomplete: it lacks usage differentiation, parameter documentation, and any note on date range handling. The 'locally cached' detail is valuable, but overall the agent gets minimal orientation beyond the tool name.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema has 0% description coverage for the two parameters. The description does not mention start_date or end_date, nor does it explain expected formats (e.g., ISO 8601) or relationships between them. Param names are self-explanatory, but the description adds no semantic value beyond what the schema field names already hint at.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a specific verb ('calculate') and resource ('trends from locally cached daily summaries'). It clearly distinguishes the tool from siblings like garmin_get_day or garmin_compare_periods by highlighting the 'locally cached' source and trend-focused scope.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
No explicit guidance on when to use this tool vs alternatives such as garmin_compare_periods or garmin_recent_overview. The description implies a trend calculation use case but does not state prerequisites (e.g., needing a recent sync) or exclusions. Agents must infer when selection is appropriate.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior4/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and idempotentHint=true, setting a safety baseline. The description adds behavioral context by specifying what is checked (session existence and last sync time), which is more specific than the annotations alone. No contradiction exists, and the description enriches understanding of the tool's non-mutating behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single concise sentence that is front-loaded with the primary action ('Check whether...'), avoiding any wasted words. It directly conveys the tool's purpose without redundancy.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness4/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (one optional param, no required fields, strong annotations, and an output schema), the description covers the core purpose well. However, the unexplained 'verify' parameter and the lack of mention of the return format (though output schema exists) leave a minor completeness gap.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema has one optional boolean parameter 'verify' with default false and 0% schema description coverage. The description does not mention 'verify' at all, failing to explain its purpose or effect, such as whether it forces a live check. This is a significant gap for a single parameter.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool checks whether a Garmin session exists and when data was last synchronized, using a specific verb ('Check') and resource ('Garmin session'). This distinguishes it from sibling tools like garmin_sync (which performs synchronization) and garmin_get_day (which retrieves day data), making its purpose unambiguous.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides no guidance on when to use this tool versus alternatives, nor does it mention prerequisites or exclusions. The sibling list offers context but the description itself does not direct the agent toward the appropriate use case.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior3/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, covering the safety profile. The description adds the specific output (sleep stages and metrics) but does not disclose behaviors like refresh semantics or whether include_raw affects the response. With annotations present, the added value is modest, so a 3 is appropriate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single sentence that is front-loaded with the action and resource. It is concise and every word contributes meaning, with no redundancy or filler.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness2/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
While the output schema covers return values, the description fails to explain two of the three parameters, particularly the boolean flags. For a tool with multiple parameters and low schema coverage, this is a significant gap that hinders autonomous selection and invocation. The description is not complete enough for an agent to use it correctly without additional assumptions.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, so the description must compensate. It explains 'day' as a YYYY-MM-DD date, but 'refresh' and 'include_raw' are completely unexplained. This leaves the agent without critical information on how these boolean flags alter behavior.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action (Get), the resource (sleep stages and available sleep metrics), and the scope (one YYYY-MM-DD date). This differentiates it from sibling tools like garmin_get_activity or garmin_get_body_metrics, which focus on other data types.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines4/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implies usage for retrieving sleep data for a single date, which is clear context. However, it does not explicitly mention alternatives or when not to use this tool. The clarity of the purpose provides sufficient guidance for most cases.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior3/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds modest context about the single-date scope, but does not disclose behaviors like caching, refresh semantics, or data availability expectations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
A single sentence, front-loaded with the action and resource, with no wasted words. Every word adds value and the structure is immediately scannable.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The tool is simple (2 params, annotations provide safety, output schema exists), and the description covers the core purpose. However, it leaves gaps around the 'refresh' parameter and what exactly 'training status and readiness' entails, which could matter for an agent selecting this tool.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters3/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The description provides the date format 'YYYY-MM-DD' for the required 'day' parameter, adding meaning beyond the bare schema type. However, the optional 'refresh' parameter is not mentioned at all, and schema description coverage is 0%, so the description only partially compensates.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb 'Get' and the specific resource 'Garmin training status and readiness' for a single date. This distinguishes it from sibling tools like garmin_get_day or garmin_get_sleep, making its purpose unambiguous.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines3/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implies usage for a specific date ('for one YYYY-MM-DD date'), but does not explicitly state when to choose this tool over alternatives or provide exclusions. Sibling tools exist for other metrics, but no direct comparison is given.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior3/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, and openWorld hints, so the safety profile is covered. The description adds that the summary is 'consolidated' but does not disclose behavior like the refresh parameter effect, caching, or whether it aggregates from multiple Garmin endpoints. It adds some context but not rich detail.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, front-loaded sentence with no filler. Every word contributes to conveying the tool's core purpose and date format.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity and the presence of an output schema (which documents return values), this is borderline adequate. However, the unexplained 'refresh' parameter and lack of guidance on when to use this tool vs. more specific ones leave meaningful gaps. It is minimal but incomplete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The schema has 0% description coverage, and the description only hints at the 'day' parameter via 'YYYY-MM-DD date'. The 'refresh' boolean parameter is completely undocumented in both schema and description, leaving significant ambiguity. The description does not compensate for the missing parameter semantics.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description precisely identifies the tool as retrieving a 'consolidated health summary' for a specific single date ('YYYY-MM-DD'). This clearly distinguishes it from sibling tools like garmin_get_sleep or garmin_get_activity, which focus on individual data types.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines4/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description conveys clear usage context: this is for a one-day consolidated overview. It does not explicitly name alternatives or exclusions, but the scope ('one date' + 'consolidated') implies when it's appropriate. This meets the 'clear context, no exclusions' level.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior3/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering safety. The description adds the inclusive date range and YYYY-MM-DD format but does not disclose behaviors like refresh semantics or limit handling. With strong annotations, this is adequate but minimal.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, front-loaded sentence with no redundant words. It conveys the essential action and key parameter semantics efficiently.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness4/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's moderate complexity (5 params, 2 required) and the presence of an output schema and strong annotations, the description covers the core usage adequately. However, optional parameters like refresh and activity_type are not described, so it is not fully complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters3/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, so the description must compensate. It clarifies start_date and end_date as inclusive and formatted YYYY-MM-DD, which is valuable for the required params. However, limit, refresh, and activity_type remain unexplained, leaving only partial compensation.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states a specific action (List) and resource (activities) with a defined scope (inclusive date range). This distinguishes it from sibling tools like garmin_get_activity (single activity) and garmin_get_day (daily summary).
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines4/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description gives clear context for when to use the tool—listing activities over a specified date range. It does not explicitly mention alternatives or exclusions, but the purpose is evident enough to guide selection among siblings.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior4/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, which cover safety and idempotency. The description adds specific behavioral nuance about sample capping and the need for explicit request, which is valuable context beyond the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is just two sentences, front-loaded with the main purpose and free of any filler. Every word earns its place, achieving high clarity with minimal length.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
While an output schema exists, the description leaves gaps: 'capped' is vague without a specific limit, and the refresh parameter is never mentioned. For a simple tool, it is adequate but not fully complete, especially given the 0% schema coverage.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters3/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
With 0% schema description coverage, the description must compensate. It explains include_samples ('unless explicitly requested') but gives no detail about activity_id or refresh. activity_id is obvious from the name, but refresh remains undocumented, so the description only partially covers parameter semantics.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description 'Get one activity' uses a specific verb and resource, clearly distinguishing it from sibling tools like list_activities or get_day. The phrase 'Samples are capped and omitted unless explicitly requested' further specifies the tool's scope and behavior.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines4/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description makes it clear that this tool retrieves a single activity, which inherently differentiates it from list-focused siblings. It also hints at the need to request samples explicitly, but it does not explicitly state when to avoid using it or name alternative tools.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior4/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds a behavioral warning about rate-limiting on Garmin's unofficial API, which is not covered by the annotations. It also specifies the scope of data synchronized. The annotations already indicate the tool is read-only, idempotent, and non-destructive, so the description complements these without contradiction.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is two short sentences with no redundant information. It front-loads the purpose and then adds a necessary caution, making it well-structured and concise.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness4/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (one optional parameter), the presence of rich annotations, and an output schema, the description covers the core functionality and a key operational concern. It doesn't explicitly state that this tool should be called before using getter tools, but that is implied by its role among siblings. Overall, it is sufficiently complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The description does not mention the 'days' parameter, and the schema has no description for it (0% coverage). The tool's single parameter name is somewhat self-explanatory, but the description fails to explain how it controls the synchronization range (e.g., 'recent' could mean different values). This is a clear gap that the description should have filled.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states a specific action: synchronize recent Garmin daily summaries and activities into the local cache. It includes a verb, resource, and destination, distinguishing it from sibling tools that focus on reading/querying data.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines4/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description advises to 'use sparingly' due to potential rate limiting, which is a clear usage instruction. However, it does not explicitly name alternative tools or mention when not to use this tool, though the group of sibling tools suggests it is for populating the cache for later reads.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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