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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds genuinely new behavioral context: the log mixes human notes with automatic status-change entries and is ordered newest first, plus the cost model (no credits consumed). It does not mention pagination or result limits, keeping it from a 5.

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?

A single tight sentence that front-loads the resource and immediately follows with content scope, ordering, and cost. Every clause carries information; nothing is filler.

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 the work of characterizing the return: an ordered list of note and status-change entries. Combined with annotations that cover the safety profile, an agent has what it needs to call and interpret this correctly; only pagination/limit behavior is unaddressed.

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% — both projectId and prospectId are documented, including where to obtain each value (list_projects, list_link_prospects). The description adds nothing about the parameters, so the baseline 3 applies.

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?

Names a specific resource (a prospect's activity log) and defines its exact contents: manually-typed notes plus auto-recorded status changes, newest first. That precision distinguishes it from list_link_prospects (which lists prospects themselves), add_link_prospect_note, and update_link_prospect_status without the agent needing to open another 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?

Usage is only implied — an agent infers you call this when you need the history of a prospect. There is no explicit when-to-use, no statement of when another tool (e.g. list_link_prospects) is the better choice, and no prerequisites. The 'FREE (no credits)' note is a mild selection signal but is not usage guidance.

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