Read one published record by stable ID, with body, applicable conditions, evidence type, revision and canonical citation URL. Missing or withdrawn records return item=null. Original-source excerpts are not independent execution evidence.
| Name | Required | Description | Default |
|---|---|---|---|
| id | Yes | ||
| language | No | en |
| Name | Required | Description | Default |
|---|---|---|---|
| item | Yes | ||
| _trust | Yes |
Changes observed during successful MCP inspections.
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+]Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior. The description adds non-obvious behavior: missing or withdrawn records return item=null, and original-source excerpts are not independent execution evidence. This usefully supplements the annotations.
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?
Three short sentences with zero waste, front-loaded with purpose and returned fields; the null behavior and evidence caveat follow in tightly scoped statements.
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 read-by-ID tool with full annotations and an output schema, the description covers the essential contract. The omitted language parameter is a minor gap, but the core behavior and null case are addressed.
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 description must compensate. It only hints that id is a 'stable ID' and says nothing about the language enum or its default, leaving one of two parameters entirely undocumented.
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?
States a specific verb and resource ('Read one published record by stable ID') and lists the returned fields, which clearly distinguishes it from siblings like get_latest or search. An agent can tell what the tool does without opening the schema.
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?
Implies usage when a stable ID is known ('by stable ID') but provides no explicit when-to-use, when-not, or alternatives among the many sibling tools. The context is inferable but not stated.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.