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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the safety profile is covered. The description adds genuinely useful context — the change only takes effect on the next deploy or redeploy — but omits what happens when the key does not exist and whether any permission scope is required.

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, front-loaded with the action and resource, with the deploy-timing caveat as the second sentence. Nothing is wasted and nothing is buried.

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 simple two-parameter destructive tool with annotations covering safety and no output schema, the description is close to sufficient. The remaining gap is the undocumented 'key' parameter, which neither the schema nor the description explains.

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 50%: project_id has a description and a pattern, but 'key' is completely undocumented in the schema. With that gap, the description should explain key format (case sensitivity, allowed characters) or deletion semantics for a missing key, and it says nothing beyond 'environment variable'.

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 a specific verb and resource ('Delete a DenkOps project's environment variable'), which is unambiguous. It does not explicitly name the sibling it pairs with (set_env) or the listing tool (list_env), so the differentiation is implied rather than stated.

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 versus set_env, list_env, or redeploy — the agent must infer that this is the removal counterpart to set_env. No prerequisites, no exclusions, and no note on whether the key must already exist.

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