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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is covered. The description adds that it returns complete article text and that post_id originates from search_blog, but says nothing about error behavior for an invalid/missing ID or how large articles are returned. With annotations doing the heavy lifting, this is adequate rather than rich.

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?

Front-loaded with the verb and resource, then workflow guidance, then Args. The middle sentence 'Returns the complete article text for a specific blog post' partly restates the opening line, a small redundancy, but nothing else is wasted.

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?

A single-parameter read tool with an output schema, so return-value documentation isn't required. The description covers purpose, prerequisite workflow, and parameter provenance; only failure modes for a bad post_id are absent, which is a minor gap.

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 coverage is 0%, so the description carries the burden for the single parameter. The Args block gives provenance ('from search_blog results'), which is genuinely useful routing information the schema lacks, though the integer type and ID format are left to the schema.

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+resource ('Get the full content of a ... blog article') and explicitly scopes it to full-text retrieval versus the search sibling. An agent can distinguish it from search_blog without opening any 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?

Names the prerequisite alternative directly: 'Use search_blog first to find relevant articles, then use this tool to read the full content.' The condition that selects this tool over search_blog is spelled out, leaving nothing to inference.

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