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Pre-execution blocking

As explained in Build an AI Agent (From Scratch)

Pre-execution blocking is a safety technique that prevents an action from running until the required approval has been granted.

Pre-execution blocking prevents tools marked as requiring confirmation from running until approval arrives. The agent stores pending calls instead of executing them, while safe tools continue immediately. section 6.3.7

Why the boundary matters

File deletion and payment processing must not run before approval. If three calls are pending, a user can approve two and reject one. section 6.3.7

How Build an AI Agent (From Scratch) covers it

How deep it goes
Explains interception, state persistence, pause-resume control, and confirmation processing down to framework methods.
Examples
Uses file deletion, payment processing, and three-call selective approval as concrete safety scenarios.
What it assumes
Assumes familiarity with agent tool calls, execution context, tool results, and an asynchronous Python-style execution loop.
What you can do after
Operate an agent that pauses for approval and executes only explicitly approved tool calls.
How it connects
Connects tool confirmation with pause and resume, tool results, execution state, and approval whitelists.
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This explainer was generated by Manning's knowledge graph from the text of Build an AI Agent (From Scratch). The section links point to the parts of the book it draws on.