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

Annotations already declare readOnlyHint and destructiveHint, so the trailing 'Read-only' is redundant, but the description adds real value annotations cannot: the payload is English Markdown delivered in a `markdown` field and the content covers what works inside noback, packages and limits. No pagination or size caveats are mentioned, so not a 5.

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?

Front-loaded with the return type and payload field, then the content scope, then the call-to-action. Slightly dense with parenthetical lists, and the final 'Read-only' clause duplicates annotations, but nothing is padding.

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 carries the burden of describing the return, and it does: language, format, and the `markdown` field name. Combined with the topical table of contents, an agent knows both when to call it and what it will get back.

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 has zero parameters, which sets the baseline at 4. The description correctly implies no arguments are needed and instead spends its space explaining the return payload, which is the useful information here.

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 ('Returns noback's guide for writing apps') plus the exact return shape (English Markdown in `markdown`). The scope enumeration ('single-file HTML app... localStorage, window.storage or app.db', packages, limits, publishing) makes it unmistakably distinct from create_app/update_app/validate_app, which act on apps rather than document them.

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?

Explicitly instructs 'Read it once before writing or changing an app for noback', which tells the agent exactly when to call it relative to the create/update siblings. It gives no explicit when-not or cost/latency caveats, keeping it short of a 5.

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