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

Annotations already declare readOnlyHint=false, destructiveHint=true, idempotentHint=true, and openWorldHint=false, so the safety profile is covered elsewhere. The description adds essentially nothing beyond that: it does not say whether the state change is reversible, what happens to the deal's stage/pipeline position, or whether the loss reason is surfaced to other users.

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 short sentence with the core action front-loaded and an inline example that earns its place. No filler, though it is brief enough that the terseness is more a gap in coverage than a virtue.

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 two-parameter, non-idempotent-by-name but destructive mutation with rich annotations and no output schema, the description gives the essential action and the meaning of the one non-obvious argument. Nothing critical to invoking it correctly is missing, even if richer behavioral notes would be a bonus.

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 0%, so the description must carry meaning. It explains that lossReason is free-text justification and gives a realistic example ('Budget moved to 2027'), which helps an agent phrase the value, but dealId is left entirely to its self-evident name and nothing is said about the 500-character bound or validation behavior.

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 and resource ('Mark a deal as lost') plus the accompanying input ('with a reason'), so the operation is unmistakable. It does not explicitly differentiate from siblings such as mark_deal_won, delete_deal, or move_deal_stage, which keeps it from a 5.

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?

The description offers no when-to-use guidance, no prerequisites (e.g. deal must be open), and no mention of the obvious alternative mark_deal_won or of move_deal_stage for pipeline changes. Usage is only inferable from the verb itself.

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