Does the description clearly state what the tool does and how it differs from similar tools?
States a specific verb and resource: 'Fetch full detail for one of the caller's own standing-agent runs by id', and enumerates the payload fields (status, goal, tickers, cost, artifact ids, role breakdown, error). It also names the sibling that produces the id (list_agent_runs), so it is distinguishable from list_agent_runs without opening a schema.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.