get_signal_timeline

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

With no annotations provided, the description carries the full burden. It discloses that the trail is 'append-only' (immutable/historical), which is useful, but does not explicitly state whether the tool is read-only, whether it has side effects, or any other behavioral details like ordering or pagination. It gives some context but not a rich behavioral profile.

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, front-loaded sentence: 'Get the append-only discovery/change trail for a stable Signal ID.' Every word earns its place; no redundant or filler content.

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 simple one-parameter get-by-ID tool with an output schema, the description is largely sufficient. It covers the core purpose and the nature of the data (append-only trail). It could mention return ordering or include a note about pagination, but the word 'trail' implies a sequence, and the output schema presumably defines the structure. The tool's simplicity lowers the burden.

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?

The schema provides only a bare string property 'signal_id' with 0% description coverage. The description adds the qualifier 'stable' to signal ID, hinting that the ID is persistent and not transient. However, it does not explain what a signal is, where to find the ID, or any format constraints, leaving the parameter semantically under-specified.

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 the specific verb 'Get' and names a clear resource: 'the append-only discovery/change trail for a stable Signal ID.' It differentiates from sibling tools like search_project_updates and get_project_context, which serve different purposes (searching updates vs. getting a timeline).

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 context is clear: this is for retrieving the change trail for a specific Signal ID. It doesn't explicitly state when not to use it or point to alternatives, but the 'append-only trail' phrasing strongly implies it's for historical/change tracking rather than, say, searching or listing projects.

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