1Stop a background shell process.
 2
 3<usage>
 4- Provide shell_id from a background bash execution
 5- Immediately terminates the process (SIGTERM)
 6- Shell ID becomes invalid after killing
 7</usage>
 8
 9<when_to_use>
10- Stop servers or watchers you started
11- Clean up processes no longer needed
12- Cancel long-running commands
13</when_to_use>
14
15<example>
16```
17shell_id: "abc123"
18```
19→ Stops the background process.
20</example>