fetch_status

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

With no annotations, the description must carry the full behavioral burden. It usefully discloses that the endpoint is public and credential-free, which is real added context. It says nothing about return shape, freshness/caching, or rate limits, which for a zero-parameter health endpoint are the remaining unknowns.

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, zero filler, and the core scope is front-loaded ahead of the access note. Every clause earns its place.

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?

For a trivial zero-param read tool this is nearly sufficient, but with no output schema the agent has no idea what the aggregate response contains (per-component statuses? overall boolean? severity levels?). A sentence on the return shape would close the only meaningful gap.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; baseline 4 applies. The description correctly implies no filtering or input is required.

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 gives a specific verb ('Aggregate') and resource ('service health of the exchange stack') and even enumerates the components (indexer / engine / oracle / bots), so the scope is clear. It stops short of explicitly distinguishing itself from the similarly named sibling get_service_status or fetch_market_status, leaving some ambiguity for an agent choosing between health-check tools.

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 implies context with 'as used by status pages' and states the precondition 'Public — no credentials needed', which is genuinely useful for deciding whether to call it. However, it never says when to prefer this over get_service_status or fetch_market_status, so usage is only inferred rather than directed.

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