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

Annotations already declare readOnly/idempotent/non-destructive/closed-world, lowering the bar. The description adds real value for a tool with no output schema by disclosing the exact returned fields and the Markdown-vs-outline behavior. It omits error/not-found behavior but is otherwise solid.

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 what is returned and dense with useful detail. The bilingual duplication (Russian then a condensed English restatement) is slightly redundant, but the English line still earns its place by adding the URL-citation instruction.

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-only tool with no output schema, the description covers both invocation modes and the full return shape, so an agent knows how to call it and what to expect. Nothing essential is missing.

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 100%, so both parameters are fully documented in the schema itself. The description's mention of the section parameter adding Markdown largely restates what the schema already says, so the 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 (returns) and resource (a guide), and enumerates exactly what is returned: title, URL, description, update date, intro, and H2 sections. It also distinguishes its two distinct modes (full outline vs. single-section Markdown), which cleanly separates it from search_guides.

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?

Clear context for both modes: without 'section' you get the structure, with 'section' you get one section's Markdown, plus an explicit instruction to cite the returned URL. It does not explicitly name search_guides as the discovery prerequisite, though the slug schema description covers that.

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