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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is settled. The description adds two pieces of non-annotation context: an auth prerequisite (signing in to FundingTracker) and the scope of data returned, including matched bank debits. It does not say what happens if the id is unknown or belongs to another user, which keeps 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 dense sentence that front-loads the verb, resource and id source, then lists the payload contents. Nothing is redundant with the title, and every clause carries information.

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 carries the burden of describing return values, and it does so concretely (contract terms, balance, projected payoff, recent payments, matched bank debits). Auth is noted; only error/not-found behavior is left implicit.

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?

One required parameter with 100% schema description coverage; the schema already documents the UUID format and the list_my_deals provenance. The description reinforces that provenance but adds no format or constraint detail beyond the schema, 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?

Specific verb and resource ("Get one of the signed-in user's deals by id") plus an enumeration of what the response contains. It explicitly names list_my_deals as the id source, which cleanly separates it from the list sibling.

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?

Tells the agent where the deal_id must come from (list_my_deals) and that a FundingTracker sign-in is required. No explicit when-not case or alternative path is given, but for a single-record fetch the routing context is effectively covered.

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