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

No annotations are provided, so the description carries the full behavioral burden, and it discloses nothing: not that this executes arbitrary shell commands, not sandboxing/permission behavior, not whether execution is destructive or irreversible, and not what the response contains. For an arbitrary command-execution tool this is a critical omission.

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?

It is short, but shortness here reflects under-specification rather than economy. The entire description is a fragment with no front-loaded explanation of what invocation does or returns, so nothing earns its place and nothing useful is conveyed.

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 command-execution tool with zero annotations, no output schema, and an effectively undocumented parameter, the description is completely inadequate. An agent cannot determine safety, input format, or expected result from what is given.

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 nominally 100%, so the baseline is 3. However, the single 'detail' parameter is described only as "Specific parameters for this action," which is a placeholder that provides no real semantics; the description adds nothing beyond it. A 3 is the rule-mandated baseline despite the weak schema text.

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 names a resource (terminal command) and the shell variant (zsh), which does differentiate it from the bash/sh siblings. However, "runner operator" is cryptic jargon and the phrasing largely restates the tool name rather than stating a clear verb+outcome. It is more a label than a purpose statement.

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 zsh versus the sibling command__bash, command__sh, or the interpreter__* code-execution tools. Nothing indicates prerequisites, expected input form, or the conditions that should select this tool over its near-identical siblings.

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