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

Annotations already provide readOnlyHint=false, openWorldHint=false, destructiveHint=false, so the safety profile is partially covered. The description adds useful context about the secure connection flow and that the tool returns a one-time URL and confirmation code, as well as the availability note. However, it doesn't disclose side effects such as whether calling this invalidates a previous connection attempt, what happens to existing sessions, or whether repeated calls create multiple pending connections. With annotations present, the bar is lower, but more behavioral context would be valuable.

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?

The description is compact (two sentences) and front-loads the primary behavior and output before adding availability and security details. The parameter sematics are embedded in the schema rather than bloating the description. One minor deduction because the availability clause and security phrasing could be tightened without losing meaning, but overall it is well-structured.

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 connection-flow starter with one optional parameter and no output schema, the description covers the essential behavior, outputs, and availability. The inclusion of the confirmation-code/output expectation partially compensates for the missing output schema. The main gap is not describing what happens on repeated calls or whether the returned URL expires, which would make it fully complete for an agent performing the connection flow.

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 100% and the parameter is documented in detail: what it is ('Opaque Red connection reference'), where it comes from, how to pass it, and crucially what it is NOT ('not an API key'). The description also adds operational guidance about MCP client session rotation (Vibe/Mistral) and warns against starting a new connection after empty lookups. This goes well beyond the schema alone, justifying above-baseline scoring.

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 ('Starts'), identifies the resource ('secure Red / Big Red Cloud connection flow'), and states the key outputs ('one-time connection page URL and confirmation code'). It also distinguishes itself from the broader connection lifecycle by noting it is available even without an existing company connection and that confirm_company_connection is the follow-up tool. This makes sibling differentiation clear.

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 states a clear trigger context ('Available without an existing company connection'), which tells an agent when to start here. The sibling tool brc_confirm_company_connection is referenced indirectly via the parameter description, giving some routing context. However, it does not explicitly state when NOT to use this tool or name alternatives for resuming/confirming the flow, leaving room for stronger routing guidance.

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