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

Annotations already supply readOnlyHint=true, so the safety profile is covered. The description adds provenance (MetalTakip-computed) and an explicit exclusion (no raw third-party data), going beyond the bare annotation. It does not disclose update frequency or output structure, but for a no-parameter read-only tool this is acceptable.

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?

A single sentence front-loads the core definition, lists the concrete indicators, and ends with a crisp exclusion. No filler or repeated title.

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?

The tool takes no parameters and has a read-only annotation; the description's enumeration of the returned series gives an agent enough to decide whether to call it. It could mention update cadence or units, but the absence is not critical for a simple zero-parameter resource.

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, so there is nothing to document. Baseline 4 applies; the description adds no parameter details because none are needed.

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 clearly identifies the resource as derived market indicators computed by MetalTakip and enumerates specific series (physical/digital/quarter gold premiums, annual changes in official monthly flows). It signals it is not raw third-party data, which separates it from fetch/search, though it lacks an explicit action verb and does not name sibling tools directly.

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?

There is no explicit when-to-use statement or alternative routing. The 'does not contain raw third-party data' clause implies this is for derived/premium figures rather than raw data, but it never names fetch, search, or gunluk_ozet or states when to prefer them.

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