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

Annotations already declare readOnlyHint=true and openWorldHint=true. The description adds context by stating the output is a 'structured, audited deliverable' and provides a reference case (Alan × Gapup Hub) that illustrates typical output content (products, fit, ARR potential). This goes beyond the annotations without contradicting them.

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 description is three sentences, but the second sentence (reference case) is moderately informative yet somewhat noise. The first sentence is jargon-heavy ('Gapup agent-payable C-suite expertise (CRO)'). A more concise explanation of purpose and parameters would improve.

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?

Given the complexity (nested objects, no output schema, low schema coverage), the description falls short. It doesn't explain the return structure, required nested fields (e.g., account.currentProducts), or how the portfolio array is used. The reference case gives a glimpse but lacks systematic coverage.

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?

With only 25% schema description coverage, the description should compensate by explaining the required parameters (account, company, portfolio). Instead, it vaguely says 'send the documented case fields' without detailing what fields or how they map to the input schema. No parameter meaning is added beyond 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?

The description states it provides cross-sell recommendations via a 'structured, audited deliverable', clearly indicating the verb (recommend) and resource (cross-sell opportunities). However, it does not differentiate from the sibling tool 'upsell_hunter', which likely serves a similar purpose.

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?

No explicit guidance on when to use this tool versus alternatives. The mention of 'Gapup agent-payable C-suite expertise (CRO)' hints at a sales audience but provides no exclusions or context that helps an agent decide between this and similar tools in the sibling list.

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