open_cpacs

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

With no annotations at all, the description carries the full burden and discloses little: it doesn't say whether an already-open session is replaced or errors out, whether the file path must exist or the XML must validate, what side effects the call has, or what it returns. Only the accepted source forms are surfaced.

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?

A single front-loaded sentence with no filler and no redundancy. It is efficient, though the brevity borders on under-specification for a stateful session-creation tool.

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?

The tool is simple (2 required params, no nesting, no output schema), so a short description is defensible, but for a stateful opener with zero annotations the description should at least hint at the resulting session or the error/overwrite behavior. What is present covers inputs only.

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 has to compensate, and it partly does by explaining that the source may be either a file path or an XML string — which maps directly to the source_type enum (path | xml_string) and the source string. It stops short of stating explicitly that source_type selects how source is interpreted, or any format/validation expectations.

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 uses a specific verb ('Open') plus resource ('CPACS session') and enumerates the two supported input forms, so the agent knows exactly what the tool establishes. It is clearly distinct from siblings like close_cpacs and get_configuration_summary, though it never names those siblings explicitly.

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?

Usage is only implied: 'open a session' suggests it must be called before session-dependent tools and paired with close_cpacs, but the description never states prerequisites or when-not-to-use. There are no explicit alternatives or conditions spelled out.

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