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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true and destructiveHint=false, so the safety profile is fully covered by structured fields. The description adds one useful behavioral qualifier — that only 'live' connectors are returned — but nothing about the open-world/remote-catalog implication of openWorldHint.

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 front-loaded sentence with no filler; the scope word 'live' is placed where it matters and nothing extraneous is added.

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 parameterless, read-only catalog enumeration with no output schema, the description tells the agent what the result contains (tools plus their purposes), which is the main thing it needs. Minor gaps: no pagination/format note and no hint at how large the catalog might be.

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; the baseline for a no-param tool applies. No schema-derived meaning is lost.

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 (list) plus resource (connector tools) and scopes it to 'live' entries in the market connector catalog, so an agent knows exactly what comes back. It does not, however, differentiate itself from siblings like browse or official_facts, which a catalog-enumeration tool arguably could.

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?

The name 'help' plus 'list every ... tool and its purpose' implies a discovery/onboarding use case, but the description never states when to call it versus the many listing siblings (browse, list_world, official_facts). Usage is inferable rather than explicit.

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