BFL MCP Server
Server Quality Checklist
Latest release: v1.0.0
- Disambiguation5/5
The two tools have clearly distinct purposes: 'edit_image' modifies an existing image, while 'generate_image' creates a new image from scratch. There is no overlap in functionality, making it impossible for an agent to confuse them.
Naming Consistency5/5Both tools follow a consistent verb_noun pattern ('edit_image' and 'generate_image'), using the same naming convention and style. The verbs are distinct and appropriately descriptive for their actions.
Tool Count2/5With only two tools, the server feels thin for an image generation/editing domain. It lacks essential operations like retrieving, listing, or deleting images, and does not cover a complete workflow, making it under-scoped for typical use cases.
Completeness2/5The tool surface is severely incomplete for an image-related server. It includes generation and editing but misses critical operations such as retrieving, listing, managing, or deleting images, leaving significant gaps that will hinder agent functionality.
Average 3.1/5 across 2 of 2 tools scored.
See the Tool Scores section below for per-tool breakdowns.
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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?
With no annotations provided, the description carries the full burden of behavioral disclosure. It mentions the model but doesn't cover critical aspects like rate limits, authentication requirements, potential costs, error conditions, or what the output looks like (e.g., image data format). For a generative tool with zero annotation coverage, this is a significant gap.
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, efficient sentence that directly states the tool's purpose without unnecessary words. It's appropriately sized and front-loaded, with every element contributing essential information.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness2/5Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the complexity of image generation, no annotations, and no output schema, the description is incomplete. It doesn't address behavioral traits, output format details, or usage context, making it inadequate for an agent to fully understand how to invoke this tool effectively.
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?
Schema description coverage is 100%, so the schema fully documents all 5 parameters. The description adds no additional parameter semantics beyond what's already in the schema (e.g., it doesn't explain prompt best practices or safety tolerance implications). Baseline 3 is appropriate when the schema does the heavy lifting.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action ('generate an image') and specifies the model ('FLUX.1 Kontext model'), which distinguishes it from generic image generation. However, it doesn't explicitly differentiate from the sibling 'edit_image' tool, which would require mentioning this is for creation from scratch rather than modification.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5Does 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 like 'edit_image'. It lacks context about appropriate scenarios, prerequisites, or exclusions, leaving the agent to infer usage based solely on the tool name and parameters.
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?
No annotations are provided, so the description carries the full burden of behavioral disclosure. It mentions the model ('FLUX.1 Kontext') but does not describe key behavioral traits such as whether the tool is read-only or destructive (implied as destructive since it edits images), authentication needs, rate limits, error handling, or output format details. The description is minimal and misses critical operational context for a mutation tool.
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, efficient sentence that directly states the tool's purpose without unnecessary words. It is front-loaded with the core action ('Edit an existing image') and includes essential context (model and prompt basis). Every part of the sentence contributes value, making it highly concise and well-structured.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness2/5Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's complexity (editing images with multiple parameters) and lack of annotations and output schema, the description is incomplete. It does not cover behavioral aspects, output details (e.g., what is returned), error cases, or usage constraints. For a mutation tool with no structured safety or output information, the description should provide more context to be adequately helpful.
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?
Schema description coverage is 100%, so the schema fully documents all 6 parameters. The description does not add any parameter-specific information beyond what the schema provides (e.g., it doesn't explain prompt formatting, image encoding details, or safety tolerance implications). Baseline score of 3 is appropriate as the schema handles parameter documentation adequately.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the verb ('Edit') and resource ('an existing image'), specifying it uses the 'FLUX.1 Kontext model based on a text prompt'. It distinguishes from the sibling tool 'generate_image' by focusing on editing existing images rather than generating new ones, though it could be more explicit about the distinction. It's not a tautology and provides specific action details.
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 editing images with a text prompt, but does not explicitly state when to use this tool versus alternatives like 'generate_image'. It provides context (editing existing images) but lacks explicit guidance on exclusions or prerequisites, such as when not to use it or what alternatives exist beyond the sibling tool.
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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