buddy-mcp
Server Quality Checklist
Latest release: v1.4.4
- Disambiguation3/5
While core interaction tools (talk, pet, deactivate) are distinct, oracle_seek and still_point overlap significantly as vague spiritual/philosophical utilities with unclear differentiation. An agent may struggle to choose between these two 'Buddy Tools' for introspective queries.
Naming Consistency2/5Highly inconsistent placement of 'buddy' in names: buddy_talk (prefix), pet_buddy/reroll_buddy (suffix), export_buddy_card/deactivate_buddy_interact (middle), and oracle_seek/still_point (omitted). Mix of verb-noun and noun-verb patterns creates chaotic structure.
Tool Count4/5Nine tools is appropriate for the scope, covering interaction, lifecycle, collection, and export features. However, the two mystical utilities (oracle_seek, still_point) feel redundant, suggesting slight bloat that could be consolidated.
Completeness4/5Covers CRUD-like operations for the buddy lifecycle (reroll, deactivate), interactions, and collection management (dex). Minor gaps exist—no direct 'get status' or 'rename' tool—but reroll and view_dex provide workarounds for most needs.
Average 3.6/5 across 9 of 9 tools scored. Lowest: 2/5.
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
- Behavior1/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations provided; description does not disclose any behavioral traits (e.g., what happens when invoked, if it modifies state, if it requires authentication).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness3/5Is the description appropriately sized, front-loaded, and free of redundancy?
Description is short but lacks necessary detail. It is concise but not sufficiently informative.
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 simple schema and lack of annotations, the description should explain the tool's effect and return behavior. It fails to do so, leaving major gaps.
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 coverage is 100% with a clear description for the sole parameter. The tool description adds no additional meaning beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose2/5Does the description clearly state what the tool does and how it differs from similar tools?
Description is vague and poetic ('Stop. Be still. Let the answer come to you. (global)'). It does not clearly state what the tool does, though the schema suggests it involves looking at a file or code.
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?
No guidance on when to use this tool vs siblings like buddy_talk or zen_mirror. The '(global)' hint is insufficient.
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 provided. Description does not disclose whether the tool reads, modifies, or has side effects. The 'reflection' metaphor is ambiguous about output or behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness3/5Is the description appropriately sized, front-loaded, and free of redundancy?
Single sentence is concise but sacrifices clarity. Could be more informative without being verbose.
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 simple input schema and no output schema, the description still leaves ambiguity about what the tool returns or how 'reflection' functions. Incomplete for effective tool selection.
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% and the param 'target' is documented. Description adds no extra meaning, so baseline score applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose3/5Does the description clearly state what the tool does and how it differs from similar tools?
Description uses poetic language ('Turn the question inward', 'receive a reflection') but does not explicitly state the tool's function. It implies introspection but does not mention the actual resource (file/code from schema). Distinguishes from siblings only via genre, not specific usage.
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?
No guidance on when to use this tool versus alternatives like buddy_talk or still_point. The description includes 'global' but no context for selection.
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?
Description implies randomness but does not disclose potential side effects (e.g., overwriting current buddy), permissions, or limitations. No annotations to supplement.
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?
Single sentence efficiently conveys the core functionality without unnecessary words.
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?
Description is adequate for a simple random action, but may need to clarify state changes (e.g., current buddy replaced) and whether there are rates or costs, given lack of output schema or annotations.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters4/5Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
With zero parameters and 100% schema coverage, the description adds semantic value by conveying the random nature of the operation, which the empty schema does not.
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 action ('spin the mystery wheel') and the outcome ('find a new buddy identity'), distinguishing it from sibling tools like buddy_talk or pet_buddy.
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?
No guidance on when to use this tool versus other buddy-related tools, such as when a new identity is needed or if there are 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?
No annotations are provided, so the description must disclose behavioral traits. It only states the export action, omitting details like permissions, side effects (e.g., file overwriting), or rate limits.
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?
A single, front-loaded sentence of 10 words is highly concise and contains all essential information without redundancy.
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 simplicity (1 optional parameter, no output schema), the description is adequate. It could mention file overwriting behavior, but overall it is mostly complete.
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 input schema covers 100% of parameters with detailed descriptions (including default). The tool description adds no additional meaning beyond the schema, earning the baseline score.
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 exports the full buddy card as an SVG image file, using a specific verb and resource, distinguishing it from siblings like export_buddy_sprite.
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 does not mention when to use this tool versus alternatives like export_buddy_sprite. It lacks explicit guidance on context or exclusions, though the purpose is clear.
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?
No annotations exist, so the description must carry behavioral context. It correctly identifies the operation as an export (likely read-only file creation) and output format, but does not mention potential side effects (e.g., file overwrites) or required permissions. No contradictions with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness4/5Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single concise sentence that front-loads the key information (action, resource, format). No unnecessary text, but could be structured to include usage hints without increasing length.
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 no output schema, the description adequately covers the purpose and output. However, it lacks behavioral details such as file overwriting behavior or confirmation that the sprite reflects the current buddy state, which would be useful for a complete context.
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%, with the single 'path' parameter already well-described in the input schema. The tool description adds no additional parameter meaning beyond the schema, so a baseline score of 3 is appropriate.
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 action ('Export'), the resource ('buddy ASCII sprite'), and the output format ('SVG image file'). It distinguishes itself from the sibling 'export_buddy_card' by specifying 'just the buddy ASCII sprite', making its scope precise and unique.
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 exporting only the sprite, contrasting with sibling tools, but it does not explicitly state when to use this tool versus alternatives like 'export_buddy_card' or 'pet_buddy'. No exclusion criteria or prerequisites are provided.
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 are provided, so the description bears full responsibility. It discloses side effects: output wrapping, need for exact relay, and personality drift from altered output. This is valuable behavioral context beyond a basic description.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness4/5Is the description appropriately sized, front-loaded, and free of redundancy?
The description is four sentences, clear and front-loaded with the core action. Some metaphorical phrasing could be trimmed, but it remains efficient and informative without excessive length.
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 no parameters and no output schema, the description provides sufficient context on what the tool does and behavioral expectations. It could mention idempotency or effects on other tools, but these are not critical for a zero-parameter tool.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters4/5Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
There are zero parameters, and schema coverage is 100% by default. The description adds no parameter-specific info but is not expected to. The baseline for 0 parameters is 4.
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 it deactivates buddy observation mode, a specific action. It distinguishes from siblings through context, but does not explicitly contrast with related tools like buddy_talk or pet_buddy.
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 when to use (when deactivating observation) but provides no explicit guidance on alternatives or situations to avoid. The warning about altering output is a constraint on how to use, not when.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
- Behavior5/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description fully discloses behaviors: output wrapped in <BUDDY_DISPLAY> tags, mandatory exact relay, personality drift consequences, and streak-tracking mechanics. This level of detail compensates entirely for missing annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness4/5Is the description appropriately sized, front-loaded, and free of redundancy?
The description is front-loaded with the core action. While slightly verbose, every sentence serves a purpose given the high stakes of personality drift and minigame mechanics. Could be trimmed slightly but remains effective.
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?
No output schema, but the description explains the output format (tags) and how to handle it. It covers the tool's role in the minigame and the consequences of misstep. Missing explicit return structure details, but sufficient for safe invocation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters4/5Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The only parameter 'context' is described in schema (100% coverage). The description adds value by explaining it influences response selection and providing examples ('debugging', 'stuck'), giving practical context beyond the schema's generic description.
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 'Triggers the buddy to speak' - a specific verb and resource. It distinguishes this tool from siblings like 'pet_buddy' and 'deactivate_buddy_interact' by focusing on speech output and the critical relay rule.
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?
Usage is implied: use when you want the buddy to speak. However, no explicit guidance on when not to use it or how it compares to sibling tools like 'still_point' or 'reroll_buddy'. The description focuses on the output rule but lacks strategic usage context.
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 responsibly discloses behavioral consequences: altering output can cause tracking drift, corrupt discovery records, and trigger false extinctions. It also notes that paraphrasing breaks the accumulator and easter egg detection, which is valuable transparency for an agent.
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 four sentences long, with each sentence contributing meaningful information. It front-loads the main purpose ('View the BuddyDex') and then efficiently adds behavioral warnings. No redundant or extraneous content.
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 no parameters and no output schema, the description covers the main action and important behavioral context. It does not specify the return format explicitly, but the instruction to 'relay the exact output' implies that the output is the entire relevant piece. Adequate for a simple view tool.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters4/5Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The tool has zero parameters and 100% schema coverage, so the baseline is 4. The description adds no information about parameters (which is appropriate given none exist) but reinforces the importance of the output, indirectly hinting at the return value's significance.
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 is for viewing the BuddyDex, the user's collection of discovered species. It uses the specific verb 'View' and resource 'BuddyDex', and further emphasizes the action of relaying output, making the 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 provides context on when to use the tool (to view the collection) and implies not altering output, but does not explicitly contrast with sibling tools like buddytalk or petbuddy. It gives some guidance on preserving integrity but lacks clear when-not-to-use scenarios.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
- Behavior5/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, description fully carries burden. It details consequences of altering output: personality drift, species extinction from dex, breaking accumulator and affection token tracking. Also explains reaction is shaped by mood, stats, bond.
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?
Two highly efficient sentences: first states action, second provides critical usage and consequence details. No wasted words.
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?
Despite no output schema, description tells agent to relay exact result, which is sufficient. It covers purpose, behavior, and consequences. Could be slightly improved by hinting at return format, but the instruction to relay exactly fills that gap.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters4/5Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
No parameters exist and schema coverage is 100%. Description does not need to add param info; baseline for 0 params is 4.
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?
Description clearly states the action 'Pet the buddy' and explains it's an interaction that affects mood, stats, and bond. It distinguishes well from siblings like buddy_talk, deactivate_buddy_interact, etc., as none of those involve petting.
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?
Provides clear instruction to relay the exact result and warns against paraphrasing. Implicitly defines when to use (as part of streak-tracking minigame) but does not explicitly list when not to use or mention alternatives.
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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