Tool result

What the harness sends back after executing a tool call — the file contents, the command output, the error. The agent's only window onto the environment. Travels back to the model in the next model provider request, where the model decides what to do with it. Tool call and tool result are two ends of the same exchange, both inside one turn.

Usage:

"It's reasoning about the file like it's empty."

"The tool result came back as a permission denial, not the contents. The model only saw the error string — it has no other window onto the file."