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

Annotations already declare readOnlyHint, idempotentHint and non-destructive behavior, so the safety profile is covered. The description adds the return format (full text as Markdown), which is genuinely useful given there is no output schema, but says nothing about lookup failure behavior or language fallback.

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?

Two short, front-loaded sentences that waste nothing and put the return payload first. The appended Russian sentence is redundant for a tool whose schema is already bilingual, costing it a point.

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?

With no output schema, the description does cover the core return value, but for a tool with four optional identifier parameters it omits identifier precedence and behavior when the article is not found or the language is unavailable. Adequate but with clear gaps.

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%, so the schema already documents all four parameters in detail. 'Pass id, slug or url' merely restates three schema fields and gives no precedence rule when multiple identifiers are supplied, so baseline 3 is appropriate.

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 ('Full text of one blog article as Markdown'), which clearly distinguishes it from list_blog_posts and search_content. It also discloses the response format up front. It stops short of naming an alternative sibling explicitly, so a 4 rather than 5.

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 implies you fetch a single article after obtaining an id/slug/url from a list result, which is useful implied guidance. However, it never states when to prefer this over search_content or get_blog_post's sibling readers, nor any exclusions or prerequisites.

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