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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description adds context the annotations do not: the listing exposes status, spend against cap and next run, which tells the agent what signal it will get back and helps it decide to call this instead of a mutation tool. It still says nothing about pagination, auth scope, or behavior for a listing with no feeds.

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?

One sentence with the verb and resource up front, then the payload summary. No filler, no restatement of the tool name, nothing to cut.

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 single-parameter read tool with full annotation coverage and no output schema, the description is nearly sufficient: it names the scope and the fields of interest. A note on what happens when the listing has no feeds, or on result size, would close the remaining 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?

Schema coverage is 100% with a single documented 'slug' parameter, so the baseline is 3. The description's 'for one listing' confirms the slug identifies a listing rather than a feed, but adds no format or lookup detail beyond what the schema already states.

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?

Specific verb (list) plus resource (listing feeds) and scope (for one listing), so the agent knows it is a read of feed configurations rather than of results or deltas. It does not name sibling tools like alterlab_feed_deltas or alterlab_feed_update to draw a hard boundary, which keeps it out of 5 territory.

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 phrase 'for one listing' implies the precondition (a known listing slug) and the read-only inspection use case is clear from 'List'. However, there is no explicit when-to-use guidance and no mention of alternatives such as alterlab_feed_deltas (per-feed performance) or alterlab_feed_update when the agent actually wants to change a feed.

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