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

Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=true, so the agent knows this is a safe read operation. The description adds useful specificity about what 'state' means (installed MCPs, connection status, accounts, catalog tool counts) beyond what annotations convey. However, it doesn't quite hit a 4 because it doesn't disclose behavioral specifics like whether accounts are returned with sensitive fields (tokens, emails) or whether the catalog count includes only active or also failed MCPs—minor gaps that a 4 would want addressed.

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?

Single sentence, under 20 words, front-loads the verb ('Returns'), and uses colons and commas for scannable structure. Every word earns its place. This is an exemplary level of conciseness.

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?

The tool has no input params, no output schema, and is a simple state inspection with strong annotations. The description fully covers what the agent needs: a list of the four pieces of state information returned. There's no missing context—the tool is simple and the description correctly matches that complexity level.

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 0 parameters, so parameter semantics are trivially satisfied. The description's value comes from telling the agent what the response will contain (state details), which is exactly what the agent needs to know to use this info. Baseline 4 is appropriate for a 0-parameter tool with solid descriptive coverage.

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 uses a specific verb ('Returns') and resource ('current toolkit state'), and explicitly enumerates the contents of that state: installed MCPs, connection status, associated accounts, and catalog tool counts. This is both precise and distinguishes it from sibling tools like 'connect' and 'authenticate', which are action-oriented rather than state-inspection-oriented.

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 description makes it clear this is a status/introspection tool (as opposed to tools that connect, authenticate, or act), so the agent can infer when to invoke it. However, it does not explicitly name alternatives or exclusions—e.g., it doesn't say 'use authenticate before connecting'—though for a stateless info tool that's less critical. The clear state-inspection framing earns a 4 rather than a 5 for lack of explicit when-not-to-use guidance.

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