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

Annotations already declare write (readOnlyHint=false), idempotent, non-destructive, closed-world, so the safety profile is covered. The description's add-on, "It changes nothing else and applies for nothing," gestures at limited side effects and consistency with destructiveHint=false but is vague enough that its meaning is unclear.

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 first sentence is tight and front-loaded. The second sentence is short but cryptic, and it consumes space without conveying a checkable fact.

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 one-parameter tool with complete schema coverage and full annotation coverage, the description says enough to invoke it correctly. The remaining gap (what saving actually makes the call appear in, or how it differs from drafting) is minor but real.

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%, so the single id parameter, its format, and its provenance are fully documented in structured data. The description adds nothing beyond that, 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?

States a specific verb and resource ("Save a call to the signed-in workspace"), which is clearly distinct from read-oriented siblings like get_open_call or list_saved_calls. However, it never explicitly contrasts itself with create_draft or prepare_draft, which are the plausible write-side alternatives.

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 gives no when-to-use guidance, no prerequisites, and no alternatives. The only workflow hint (ids come from search_open_calls or list_my_matches) lives in the schema, not the description, and nothing explains when to save versus draft.

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