MCP Memory LibSQL

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

No annotations are provided, so the description carries full burden for behavioral disclosure. It only states the action ('create') without any information about permissions needed, whether this is a mutation or read-only operation, potential side effects, error conditions, or what happens if relations already exist. This is inadequate for a tool that appears to perform write operations.

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?

The description is extremely concise at just three words, with zero wasted language. It's front-loaded with the core action and target. While it's under-specified for a tool with parameters, it earns full marks for conciseness as every word contributes meaning.

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 tool with 1 parameter (though complex with nested objects), 0% schema coverage, no annotations, and no output schema, the description is insufficient. It doesn't explain what the tool returns, error handling, or provide enough context about the 'entities' and 'relations' concepts to use the tool effectively without external knowledge.

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 0%, so the schema provides no parameter documentation. The description mentions 'relations between entities' which hints at the 'relations' parameter, but doesn't explain what 'source', 'target', and 'type' mean, their expected formats, or provide any examples. The description adds minimal value beyond the parameter name.

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 'Create relations between entities' clearly states the action (create) and target (relations between entities), avoiding tautology. However, it lacks specificity about what 'entities' and 'relations' mean in this context, and doesn't differentiate from sibling tools like 'create_entities' or 'delete_relation' beyond the basic verb.

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?

The description provides no guidance on when to use this tool versus alternatives. There's no mention of prerequisites (e.g., entities must exist first), when not to use it, or how it differs from sibling tools like 'create_entities' or 'delete_relation' in practical scenarios.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.