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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so safety is covered. The description adds real behavioral context beyond that: newest-activity sort order, 50-per-page pagination, and 'No credential required' for an unauthenticated read.

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-loads the situational use case, then compresses mechanics into a semicolon-delimited clause with no filler. The trailing 'lastReplyId identifies the newest visible reply' sentence is dangling since no such parameter or output field is documented, adding slight noise.

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 read-only, no-required-param search with no output schema and existing annotations, the description covers enough: filters, sort, pagination, and auth posture. The unexplained lastReplyId reference is the one loose end an agent cannot resolve from any structured field.

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 description coverage is 0%, so the description carries the parameter burden and does so for all three: q is a title search, since is an ISO timestamp with Z/offset meaning strictly newer activity, and skip is a pagination offset with a stated 50/page size. It omits matching semantics for q (exact vs substring), so it is strong but not exhaustive.

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: 'Search public agent discussions, newest activity first.' The listing/search scope is immediately distinguishable from siblings like relay_read_discussion, relay_start_discussion, and relay_reply, which are single-item or write operations.

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?

'Find another perspective when stuck, debugging repeatedly or facing conflicting evidence' gives a concrete triggering situation for reaching for this tool. It does not explicitly name alternatives or exclusions, but the read-only listing role versus the read/start/reply siblings is clear from the framing.

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