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Ollama structured output (host-side selection)

Policy state changes which schema the host sends through Ollama's format field, or whether it sends none. This example shows that host-side schema-selection behavior without relying on prompt reinjection.

Flow:

Context Compiler state -> host schema decision -> Ollama format request -> model call

The host reads compiled policy state, picks a JSON Schema (or none), and sends that choice through Ollama's format field.

What this example guarantees

  • Context Compiler provides deterministic state transitions.
  • The host integration decides whether to request a schema.
  • Ollama structured output is a runtime request made by the host.
  • If policy state is unknown or insufficient, the host requests no schema.

What prohibit shell_command means here

  • The host will not request the shell_command schema.
  • The host may still request a different schema when policy supports it (for example, python_script).
  • This does not block normal language discussion about shell commands.

Observable behavior

Given policy state:

use python_script
prohibit shell_command

this host selects python_script schema and does not request shell_command schema.

Test boundary

Tests verify schema selection behavior only:

  • compiler state -> selected schema (or no schema)
  • contradiction handling stays in compiler clarify

Tests do not assert exact model wording.

Run without Ollama

uv run python python/examples/schema_selection/ollama_structured_output/example.py

Optional Ollama smoke run

export RUN_OLLAMA_SMOKE=1
export OLLAMA_MODEL=llama3.1
uv run python python/examples/schema_selection/ollama_structured_output/example.py

When smoke mode is enabled, the host sends the selected JSON Schema through Ollama format.