stock-image-mcp
Server Quality Checklist
Latest release: v0.1.4
- Disambiguation4/5
Tools are mostly distinct, but search_stock_images, search_all_images, and get_best_image all deal with searching and could be confused. However, descriptions clearly differentiate single-provider vs. multi-provider vs. single-result behavior. download_image and get_attribution also overlap slightly since download_image returns attribution text.
Naming Consistency5/5All tool names follow a consistent verb_noun snake_case pattern (download_image, get_attribution, search_stock_images, search_all_images, get_best_image, get_rate_limit_status). The pattern is predictable and easy to navigate.
Tool Count5/5Six tools is well-scoped for a stock image MCP. Each tool serves a distinct function in the search-download-attribution workflow without unnecessary bloat.
Completeness5/5The tool set covers the core lifecycle: searching (single and all providers), selecting the best image, downloading locally, retrieving attribution, and checking rate limits. No obvious dead ends; agents can complete the full workflow.
Average 3.8/5 across 6 of 6 tools scored.
See the Tool Scores section below for per-tool breakdowns.
- No community issues in the last 6 months
- 11 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
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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
- Behavior2/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states what the tool returns, with no mention of error handling, rate limits, provider behavior, or what happens if no results are found.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5Is 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 the core purpose, making it highly efficient and easy to parse.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The tool is simple (2 params, output schema present), and the description covers the basic action, but it leaves gaps around usage context and parameter semantics. Given the existing output schema, the description need not explain return values, yet it still falls short in guiding when to use it over alternatives.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, and the description does not compensate for this lack. It indirectly references 'query' and 'provider' but provides no detail on acceptable values, the meaning of 'top-ranked', or the default provider behavior.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a specific verb ('Return') and a specific resource ('single top-ranked result'), clearly distinguishing this tool from sibling search tools that return multiple results. It also mentions 'one provider', clarifying its scope.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines3/5Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implies the tool's use case (getting the single best result for a query) but does not explicitly state when to prefer it over siblings like search_stock_images or search_all_images, nor does it mention 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.
- Behavior2/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of disclosing behavior. It only states the basic search action without mentioning pagination, rate limits, default provider behavior, or any side effects. This leaves significant behavioral ambiguity.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, direct sentence that front-loads the core action. There is no fluff or redundancy, and every word contributes to the meaning.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The tool has 5 parameters and no annotations, but an output schema exists which may cover return structure. The description states the core scope and default provider, which is helpful, but it omits detail on pagination and orientation. It is minimally viable but has clear gaps given the tool's complexity.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5Does 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 mentions 'query' and 'single provider' which loosely relate to the query and provider parameters, but it ignores page, per_page, and orientation entirely. The description adds minimal value beyond the parameter names.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb 'Search', the resource 'single stock image provider', and the scope 'for a query'. It distinguishes from sibling tool 'search_all_images' by emphasizing 'single' provider, 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 Guidelines4/5Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implies when to use this tool versus the sibling search_all_images by specifying 'single' provider, which contrasts with 'all'. However, it does not explicitly name alternatives or state when not to use it, so it falls short of a 5.
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?
With no annotations provided, the description carries the full burden. It states the action (inspect quota) but does not disclose whether the operation is read-only, consumes quota itself, or requires authentication. It leaves out important behavioral details that could affect usage, making it adequate but not comprehensive.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, front-loaded sentence with no wasted words. It efficiently states the tool's purpose and usage context.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness4/5Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple tool with one optional parameter and an output schema, the description provides enough context for the agent to understand its role in the workflow. It might not cover all edge cases (e.g., null provider), but given the simplicity, it is nearly complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, and the description only hints at 'per provider' without explaining the parameter's possible values or the meaning of null/default. The description does not compensate for the schema's lack of parameter details, leaving provider semantics ambiguous.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a specific verb 'Inspect' with a clear resource ('remaining request quota per provider') and distinguishes itself from sibling tools focused on searching/downloading images. It clearly states the tool's function of checking quota status.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines4/5Does the description explain when to use this tool, when not to, or what alternatives exist?
The phrase 'before deciding where to search' provides clear context for when to use the tool, but it does not explicitly mention alternatives or when not to use it. This is a clear usage guideline without exclusions.
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?
No annotations exist, so the description carries the full burden. It discloses an important behavioral trait: unconfigured or rate-limited providers are skipped with a note instead of failing the whole call. This adds partial-failure context, but it doesn't mention other behaviors like authentication, pagination, or all-providers-fail scenarios.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single sentence that front-loads the main action and appends a key edge-case behavior. There is no redundant text, and every word earns its place.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness4/5Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's low complexity and presence of an output schema, the description covers the core scope (all configured providers), concurrency, and partial failure. It doesn't explain prerequisites or all failure modes, but it is adequate for a straightforward search tool.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 0% and the description does not mention query, per_page, or orientation. The parameters are discoverable by name/type/defaults, but the description adds no meaning and fails to compensate for the lack of schema descriptions. Thus it provides minimal value beyond the raw schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states a specific action: 'Search every configured provider' and adds 'concurrently', which is a distinguishing factor from sibling tools like search_stock_images that likely target a single provider. The verb and resource are explicit.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines3/5Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implies usage for broad cross-provider searches but does not explicitly state when to use this tool over alternatives (e.g., search_stock_images) or provide exclusions. It lacks direct 'use when' or 'instead of' guidance, but the scope is inferable.
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?
With no annotations, the description carries the full burden of behavioral disclosure. It mentions the return value (saved path and optional attribution text) and the condition for attribution, but it omits details about file overwrites, error handling, or network requirements.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5Is the description appropriately sized, front-loaded, and free of redundancy?
The description is two sentences, front-loaded with the action, and every sentence adds value. There is no redundant or excessive wording.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness4/5Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple download tool with an output schema, the description covers the core purpose, usage context, and return behavior. It omits edge cases and provider semantics, but the essential guidance is complete enough for basic invocation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters3/5Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The description explains url and dest_path implicitly through the action and return value, but the provider parameter is not described, leaving its role unclear. With 0% schema coverage, this is only partial compensation for the gap.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool downloads an image URL to a local path for embedding in a blog post's asset folder. It uses a specific verb and resource, and distinguishes itself from sibling search/attribution tools by focusing on the download action.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines4/5Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implies when to use the tool—when you have an image URL and need a local copy—and provides context about the asset folder. It does not explicitly mention alternatives or when not to use it, but the purpose is clear enough relative to 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?
With no annotations provided, the description carries the full burden. The verb 'Return' indicates a read-only operation, and 'previously-returned image' hints at a prerequisite. It could be more explicit about error handling or that it does not mutate anything, but the core behavior is clear.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, tightly-worded sentence that immediately states the tool's purpose without padding. Every word earns its place.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple two-parameter tool, the description gives the essential purpose but omits key context like required parameter semantics and potential error conditions. The existence of an output schema helps, but the description alone is a bit thin for a tool that depends on prior calls.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters2/5Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 0%, so the description must compensate. It only says 'previously-returned image' without linking that to the 'provider' or 'image_id' parameters. It doesn't explain what values provider accepts or where image_id comes from, leaving significant ambiguity.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose5/5Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a specific verb ('Return') and resource ('formatted credit/attribution text') and clearly distinguishes this from sibling search/download tools. It immediately clarifies the tool's unique role in the workflow.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines4/5Does the description explain when to use this tool, when not to, or what alternatives exist?
The phrase 'previously-returned image' clearly implies this tool is used after a search call, providing helpful context. However, it doesn't explicitly mention when not to use it or name alternative tools, so it stops short of full guidance.
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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