set_app_env

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only indicates mutation ('Update') but does not disclose whether existing environment variables are replaced or merged, whether a restart or redeploy is needed, or whether changes are persistent. This is a significant gap for a mutation tool.

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 a single concise sentence with no filler and the action is front-loaded. It could have included additional behavioral context without becoming bloated, so it earns a 4 rather than a 5.

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?

While the input schema covers parameter semantics well, this is a mutation tool with no annotations and no output schema. The description omits important contextual details such as whether the app must be restarted, whether all existing env vars are overwritten, and how the update affects the running service. An agent lacks the behavioral context needed for safe invocation.

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 100%, with the env parameter already documented as 'KEY=VALUE lines'. The description adds no extra meaning beyond the schema, so the baseline of 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?

The description states a specific action ('Update') and a clear resource ('environment variables for an app'), which distinguishes it from sibling tools like set_app_resources or set_app_source_image. It does not specify whether the update replaces or merges existing variables, so it stops short of a perfect 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?

There is no guidance on when to use this tool instead of alternatives, no prerequisites, and no mention of sequencing relative to related app operations. While the purpose is inferable from the name and description, explicit when-to-use guidance is absent.

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