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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds genuinely new behavioral context: the output is a single-page PDF, the layout is a habits x days grid, and scope exclusions clarify it produces a static artifact rather than a tracking service. No auth, limits, or file-return details are given, but those are minor for a local generation tool.

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?

Two sentences, front-loaded with the usage trigger, followed by the output shape and the exclusion set. Every clause carries information and nothing is repeated from the title or annotations.

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 an output schema covering return values and annotations covering safety, the description only needs to establish intent and scope, both of which it does. Month/style/paper semantics live in a fully described schema, so no gaps remain for correct invocation.

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 all five parameters, defaults, and accepted formats are already documented in the schema. The description only echoes style (checkboxes vs stars) and the optional goal-in-brackets convention for habits, adding no syntax or format detail beyond the structured fields. Baseline 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 (generate) and resource (habit tracker printable) and quantifies the artifact: a one-page habits x days grid with checkboxes or stars, optional per-habit goal, delivered as PDF. An agent can immediately tell this apart from a chore chart or any progress-tracking tool without inspecting 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?

Opens with an explicit trigger ('Use this when the user wants a habit tracker printable') and adds a negative boundary ('Does not track progress, send reminders or analyse habits'), which prevents misuse for tracking/reminder intents. It stops short of naming the sibling generate_chore_chart as the alternative for chore-related requests.

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