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

Annotations already declare readOnly, idempotent, closed-world behavior, so the safety profile is covered. The description adds genuine context beyond them: exactly which channel types appear in the result and the firm boundary that other channels are never connected, which prevents the agent from hunting for unsupported integrations.

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 the core action and result fields. The final sentence is somewhat redundant with the 'Supported channels' list, but it does reinforce the exclusion, so it still earns its place.

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-param, read-only list tool with no output schema, the description covers action, returned fields, and the full channel universe. A brief note on whether output is always a complete list (vs paginated) 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?

Zero parameters, so there is no parameter semantics to explain; the description correctly says nothing about inputs. Baseline for a no-param tool is 4.

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 and resource ('List the accounts connected to the workspace') and even sketches the returned fields (status, last sync time). The enumeration of supported channels sharpens what 'channel' means here, though the name/description mismatch (channels vs accounts) costs a point.

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?

Usage is implied — call this to discover which accounts exist in the workspace — but there is no explicit when/when-not guidance and no reference to any sibling tool such as list_conversations or list_members. The negative constraint ('does not connect other channels') is a scope limit, not invocation guidance.

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