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

Annotations already declare destructiveHint=true and openWorldHint=true, so the safety profile is covered. However, the description adds no behavioral context beyond restating the enum values: it does not explain that lowering the mode can leave origin traffic unencrypted, whether the change propagates immediately, or whether a confirmation step is expected. For a destructive mutation, this is a meaningful gap.

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?

Two short sentences with no filler, and the core action is front-loaded. The second sentence is largely redundant with the schema enum, but it does not bloat the definition.

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 destructive, open-world mutation with an output schema available, the description is too thin: it omits the operational consequences of each mode, permission requirements, and any warning about the change affecting live traffic or certificate issuance. The structured fields cover safety flags and parameter names, but an agent needs more to invoke this responsibly.

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 coverage is 80%, so the schema already documents zone, context_id, account_slug, and environment_slug. The description lists the allowed mode values, but that duplicates the enum in the schema and does not clarify routing parameters or when account_slug is needed. Baseline 3 is appropriate when the schema is doing the heavy lifting.

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 gives a specific verb and resource ('Set SSL/TLS encryption mode for a zone'), which is clear enough that an agent can distinguish it from the read-only cf_ssl_mode_get sibling. It does not explicitly name or contrast with any other tool, but the name/description pairing is unambiguous.

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?

There is no guidance on when to use this tool versus cf_ssl_mode_get or cf_ssl_verification, nor any mention of prerequisites such as account permissions or whether the zone must already be cataloged. The description simply states what it does, leaving all usage context to inference.

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