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prolog-mcp

by umuro

prolog_query

Execute a Prolog goal and receive all solutions as JSON for deterministic symbolic reasoning.

Instructions

Execute a Prolog goal and return all solutions as JSON

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
goalYesProlog goal, e.g. 'ancestor(tom, X)'
timeout_msNoTimeout in ms (default 5000)
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries full burden. It states the tool returns all solutions as JSON but does not disclose potential behavioral traits like side-effects (likely none), rate limits, or performance implications for long-running queries.

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?

Single sentence, 10 words, highly concise and front-loaded with key information. No unnecessary words or redundancy.

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 has 2 parameters and no output schema, the description covers the core functionality. However, it lacks details on error behavior, result limits, or how JSON is structured. For a query tool, this is adequate but 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 coverage is 100%, so baseline is 3. The description adds an example for the 'goal' parameter but provides no additional context for 'timeout_ms' beyond its schema description. Overall, the description adds marginal value over the schema.

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 ('Execute'), the resource ('a Prolog goal'), and the output ('return all solutions as JSON'). It distinguishes from siblings like prolog_assert and prolog_retract which modify the knowledge base.

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 when to use prolog_list_facts for listing facts or prolog_write_file for persistence. No when-to-use or when-not-to-use context is given.

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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