How to use LLM in a script shebang

Using LLM fragments, you can write #!/usr/bin/env -S llm -f followed by a single plain sentence and run it immediately. The simplest approach is to place the prompt itself right under the shebang.

Attaching a tool like -T llm_time also lets you generate a haiku that references the current time. With -t, you can run a YAML template directly while defining Python functions as tools.

• Uses gpt-5.4-mini with a system prompt instructing it to use calculation tools.
• Registers add(a: int, b: int) and multiply(a: int, b: int) as functions.
• Running ./calc.sh 'what is 2344 * 5252 + 134' --td lets you see the order of tool calls.

In the example, multiply first produced 12310688, and then add calculated 12310822. Finally, a more complex example was presented that extends this by connecting the Datasette SQL API as a tool, enabling Q&A over blog content.