List the bald, buzz cut and fade hairstyles BaldFade can preview. Read-only, no account needed.
Scored across 2 tools
The two tools target completely different questions: enumerating hairstyle options versus explaining the Norwood hairline self-check. There is no plausible way to confuse one for the other, and both descriptions state read-only, no-charge behavior.
Both names use snake_case, which is consistent at the casing level. However the verb pattern differs between an action verb (list_styles) and a bare noun-plus-topic (norwood_info), so the convention is readable but not fully uniform.
The server is explicitly a thin read-only pointer to a paid web service, so a small surface is expected, but two tools is at the borderline of being too thin. It leaves the agent with very little to work with beyond two informational lookups.
The stated read-only scope is covered, but a style-listing tool with no companion detail lookup (dimensions, suitability, pricing per style) leaves an obvious gap when an agent wants specifics. There is also no tool covering pricing/credits or the preview workflow, so agents must follow external links to finish any real task.
List the hairstyles BaldFade can preview on a portrait photo (bald, buzz cut, fades, tapers), with a link to each style page. Read-only, no charge. Generating a preview is done on https://baldfade.net (single image 4.99 USD, or credits); this server does not upload photos or take payments.
| Name | Required | Description | Default |
|---|---|---|---|
| gender | No | Only return styles offered for this gender. |
| Name | Required | Description |
|---|---|---|
| styles | Yes |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds value beyond that by disclosing the no-charge nature and ruling out photo upload and payment side effects, preventing an agent from assuming generation happens server-side.
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 sentences, front-loaded with what is returned, followed immediately by the read-only/cost/pricing boundary. Every clause earns its place and there is no redundancy beyond the small overlap of 'read-only' with the annotation.
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 one-optional-parameter listing tool with an output schema and annotations covering safety and world scope, the description covers what is returned (styles plus per-style links) and what the tool will not do. Nothing needed to call it correctly is missing.
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% and the single gender parameter has an enum with a clear description, so the schema carries the semantics. The prose mentions style categories but never references the gender filter, so it adds nothing beyond the structured fields.
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 concrete verb and resource — list the hairstyles BaldFade can preview on a portrait photo — and even enumerates the style families (bald, buzz cut, fades, tapers) plus the per-style link. It's clearly distinct from norwood_info, though it never explicitly contrasts itself with that sibling.
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?
Draws an explicit boundary: this tool only lists styles, while actually generating a preview happens on https://baldfade.net, and the server 'does not upload photos or take payments.' That tells an agent when not to reach for this tool, but it doesn't route to the norwood_info sibling.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Explain what the BaldFade Norwood Hairline Self-Check does and its limits, with a link to the browser tool. Read-only, no charge. It is an illustrative estimate, not a diagnosis.
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
| Name | Required | Description |
|---|---|---|
| url | Yes | |
| limits | Yes | |
| summary | Yes | |
| how_it_works | Yes | |
| is_diagnosis | Yes |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=false, so 'Read-only, no charge' is partly redundant, but the description adds genuinely new context with 'illustrative estimate, not a diagnosis' — an important limitation the agent should relay. It also signals the output includes an external link to a browser tool, useful for a zero-param informational call; no contradiction with openWorldHint=false since the tool only surfaces a URL rather than fetching from the open world.
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 short sentences, front-loaded with the core purpose and followed by the key caveat. Nothing repeats the name or title verbatim and every clause (limits, link, free, not a diagnosis) carries information the agent would otherwise lack.
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?
With an output schema present, the description need not explain return values, and it covers purpose, cost, safety profile, and the critical 'not a diagnosis' framing. The only missing element is explicit guidance on when to invoke it versus list_styles, which keeps it just short of complete.
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 tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline is 4. The description correctly presents this as a parameterless lookup by framing it as a single explanatory response.
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 states a specific verb ('Explain') and a precise resource ('what the BaldFade Norwood Hairline Self-Check does and its limits'), plus the deliverable (a link to the browser tool). An agent can tell instantly that this is an informational lookup, not an action, and it does not overlap the sibling list_styles.
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?
Usage is implied rather than stated: an agent can infer this is the tool to call when a user asks about the Norwood self-check. There is no explicit 'call this when...' or 'do not call for...' guidance, and the single sibling (list_styles) is never referenced to route the agent between them.
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.
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