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

Annotations already declare readOnly/idempotent/non-destructive/closed-world, so the safety profile is covered. The description adds value beyond them by disclosing the return shape (serialised snapshot JSON with tasks, estimated hours and capture-time dates) and that the tool is available on every plan, which matters in a gated product tier system.

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?

Three short sentences, front-loaded with what it returns, followed by purpose and a plan-availability note. No filler; each sentence carries distinct information.

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?

With no output schema, the description correctly carries the return-value burden by enumerating snapshot contents. Annotations cover the operation's safety profile. Only minor gaps remain (parameter format, explicit path from list_baselines) for a simple single-parameter getter.

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?

One parameter at 0% schema description coverage, so the schema does not explain it. The description implies baselineId identifies a baseline row rather than a project, which adds some meaning, but gives no format or sourcing guidance (e.g., obtain from list_baselines).

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+resource: retrieving the full baseline snapshot for a single baseline row. The phrase 'one project baseline row' implicitly contrasts with the list-style sibling list_baselines and with compare_baseline, so an agent can pick this without opening schemas.

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 phrase 'for variance tracking' implies why one would call it, but no explicit when-to-use or alternatives (list_baselines, compare_baseline) are named. Usage is inferable rather than stated.

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