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

The description repeats the annotation profile ('READ-ONLY', 'changes nothing') but adds no new behavioral context beyond what readOnlyHint, idempotentHint, and destructiveHint already provide. There is no additional disclosure about errors, availability, or response structure.

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 short and front-loads the read-only nature. However, 'Returns data, changes nothing' is partially redundant with 'READ-ONLY', so a slightly tighter wording could make every phrase earn its place.

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 single-parameter meta-tool with annotations and an output schema, the description adequately explains the tool's function. The main missing context is how to know which tool_id values are valid, but the sibling tool names and the parameter description give enough guidance for basic invocation.

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 100% and the tool description merely echoes the tool_id parameter without adding format, examples, or constraints. It does not compensate beyond the schema, but it doesn't need to given the complete schema documentation.

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 states a specific verb ('Return') and resource ('full input schema for one inner tool_id'), and opens with READ-ONLY. It is clearly distinct from sibling tools, which are operational tools, since this is a schema-introspection meta-tool.

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 usage context is implied: an agent needing the input schema for an inner tool would call this tool with that tool_id. However, there is no explicit statement about when to prefer this over sibling tools like po_mcp_tools_search, nor any mention of how to discover valid tool_id values.

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