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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered by structured data. The description's contribution beyond that is that results include whether each app is connected, which is genuinely useful output context. It adds no further behavioral detail such as ordering, pagination, or what happens for unconnected apps, so it sits at an adequate 3.

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?

Three short sentences, front-loaded with what is returned, followed by the prerequisite and the exclusion. Every clause carries decision-relevant information; nothing is repeated from the title or the annotations.

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 zero-parameter, read-only listing tool with no output schema, the description covers what is returned (built-in tools and apps with connection status), the precondition for acting on results, and the boundary against the knowledge-base sibling. Nothing an agent needs in order 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?

The tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline applies. The schema's additionalProperties:false with an empty properties object is consistent with the parameterless framing in the description.

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 names the resource precisely: the catalog of tools that can be added to an agent, split into built-in tools (web search, scraping) and apps, plus per-app connection status. That is concrete and lets an agent distinguish it from connect_app and set_agent_knowledge, which it explicitly names as different operations. It stops short of naming set_agent_tools, the mutating counterpart, so the add-vs-list split is only implied.

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 supplies a real prerequisite rule — an app must be connected via connect_app before it can be added — and an explicit exclusion: knowledge bases are set with set_agent_knowledge instead. That routes the agent away from two wrong siblings. It does not state the positive trigger (call this to see what's available before calling set_agent_tools), which keeps it from a 5.

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