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

Annotations already declare readOnly, idempotent, non-destructive, and openWorldHint=false, so the safety profile is covered. The description adds genuinely useful context beyond that: results come from CCPEDIA's cache rather than the live API, ordering is newest-first, and an unfiltered call reveals which repos exist. It does not detail pagination or cache staleness, keeping it just short of a 5.

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 core action and scope, then packs routing guidance and the cache caveat into tight sentences. Dense but every clause carries information; no filler.

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 list tool with no output schema, the description covers what is returned (recency-sorted discussions), how to broaden or narrow (no filter vs repo/category), where the data comes from (cache, not live), and how to get detail. Nothing an agent needs to call it correctly is missing.

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%, so the schema already documents repo, limit, and category (including the max 50 and the 'read repo from a result' caveat). The description adds marginal value by clarifying the filtering behavior and that a no-filter call surfaces present repos, which is not obvious from the schema alone.

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+resource (list GitHub Discussions), the exact scope (Canton Network and Digital Asset repos cached by CCPEDIA), sort order (newest first), and filtering options. It explicitly distinguishes itself from get_discussion (Canton web forum), list_mailing_threads (sync.global lists), and get_github_discussion (full body+comments), so an agent can route correctly without opening another schema.

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?

Gives explicit when/when-not: use this for cached Canton-only discussions, but use a GitHub MCP for the live API or the user's own repos. It names the alternative tools for adjacent content types and points to get_github_discussion for detail. Nothing is left to inference.

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