mcp-qemu-lab

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states the action ('Save a VM snapshot') but lacks critical details: it doesn't specify if this is a destructive operation (e.g., overwrites existing snapshots), permission requirements, rate limits, or error conditions. The mention of 'via QMP HMP bridge' hints at technical context but doesn't clarify behavioral traits like response format or side effects.

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, efficient sentence that front-loads the core action ('Save a VM snapshot') and includes essential technical context ('via QMP HMP bridge'). There is no wasted verbiage or redundancy, making it highly concise and well-structured for quick comprehension.

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?

Given the tool's complexity (mutating operation with 3 parameters), no annotations, and an output schema (which reduces need to describe returns), the description is minimally adequate. It states what the tool does but lacks details on usage, parameters, and behavioral traits. The presence of an output schema prevents a lower score, but overall completeness is limited.

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 compensate for undocumented parameters. It mentions 'by name' which loosely relates to 'snapshot_name', but adds no meaning for 'vm_id' or 'timeout_sec'. The description fails to explain what these parameters represent (e.g., VM identifier format, timeout purpose), leaving significant gaps in understanding.

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 clearly states the action ('Save a VM snapshot') and the mechanism ('via QMP HMP bridge'), which is specific and unambiguous. It distinguishes from sibling tools like 'vm_snapshot_load' by specifying the save operation. However, it doesn't explicitly differentiate from other VM tools like 'vm_create' or 'vm_stop' in terms of resource scope, keeping it at a 4 rather than 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 provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., VM must be running), exclusions, or compare it to sibling tools like 'vm_snapshot_load' for restore operations. This lack of contextual usage information leaves the agent with minimal direction.

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