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

Annotations only say this is a non-read-only, non-destructive, non-idempotent mutation, which leaves the actual effect opaque. The description adds real value by disclosing that events are retained rather than dropped and that resumption happens elsewhere ('the owner activates it again on the Connections screen'), telling the agent there is no unpause counterpart here.

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, front-loaded with the action and resource, with the buffering behavior following immediately. No redundant restatement of the title or schema.

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 state-change tool with no output schema, the description covers the effect and the recovery path adequately. Minor gaps remain: behavior on an already-paused source and any confirmation returned are unstated.

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% for the single source_id parameter, including its format hint and pointer to list_event_connections. The description adds no syntax or format detail beyond the schema, so the baseline 3 applies.

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 gives a specific verb ('Pause') and resource ('an incoming-events source'), so an agent can distinguish this from siblings like list_event_connections or preview_event_connection. It stops short of explicitly naming a sibling alternative, so a 4 rather than 5.

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 implies usage context: pause when you want arriving events buffered rather than processed. It does not state when not to use it, what happens if the source is already paused, or how this relates to previewing the connection. Usage is inferable but not explicitly guided.

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