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

Annotations already cover the safe-read profile (readOnlyHint=true), but the description adds genuinely useful behavioral context: the data is read live from app.main and cannot drift from what is published at /guides, which tells the agent the results are authoritative and fresh. It does not mention result size or pagination, but the added freshness guarantee is meaningful beyond 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?

The payload information (what fields come back, live/fresh data) is front-loaded, which is good. However, the parenthetical about a lazy import and a comment on the import below is internal implementation detail that adds no decision value for an invoking agent and dilutes the signal.

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 an output schema present, return-value detail need not be in the description, and the description correctly focuses on provenance and freshness instead. For a zero-parameter read tool this is nearly complete; only the sibling-routing guidance is thin.

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?

The tool takes zero parameters, so per the rubric the baseline is 4; there is no parameter syntax for the description to explain and none is needed.

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 first sentence states a specific resource (Storskarvia's evergreen craft/how-to guides) and the exact fields returned (titles, slugs, URLs), so an agent knows this is a metadata listing rather than full content. It does not explicitly contrast itself with get_guide (single-guide retrieval), but the 'list' semantics plus returned fields make the distinction inferable.

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?

Usage is only implied by the verb 'list' and the field inventory; there is no statement of when to choose this over get_guide or get_findings, and no exclusions or prerequisites. Adequate but leaves the agent to infer the routing decision.

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