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

Annotations already establish the read-only, non-destructive, closed-world profile, so the description is not obliged to repeat it. What it adds is real: the brief is compiled every Sunday from the change ledger and covers what moved, what the registers did, and what is due, which tells the agent about freshness and data provenance. Gaps remain on output size, whether the 'permanent page' is a URL, and pagination behavior for a long text body.

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 content inventory is front-loaded in a single dense sentence followed by the use-case sentence, with no filler. The enumeration of brief components is long but each item carries information about what will be returned.

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?

There is no output schema, so the description has to carry the return shape, and it does: subject, opening figures, every text block, and the permanent page. Combined with the stated weekly compilation cadence, an agent could call this confidently; only freshness guarantees and response size are unaddressed.

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 coverage is 100% with a single optional locale enum already documented as 'en or ar; default en'. The description adds nothing about locale, which is acceptable at full coverage, but it also does not explain how locale affects content beyond language, so the 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?

The description names a specific resource, the current weekly energy brief, and enumerates its parts: subject, opening figures, full text blocks, and the permanent page for the week. It clearly implies retrieval and is distinguishable from a by-id 'get_brief' or 'list_briefs', though it does not name those siblings explicitly.

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?

It gives one concrete use case ('what happened this week in Saudi energy'), which is genuinely helpful routing guidance. However, it offers no exclusions or alternatives — nothing says to use list_briefs for past weeks or get_brief when a specific brief is wanted — so the agent must infer boundaries.

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