PR #25412: fix(responses): extract cache_control_injection_points from extra_body

• Repository: BerriAI/litellm
• Author: lawrence3699
• State: closed | merged: False
• Link: https://github.com/BerriAI/litellm/pull/25412

Description (problem / solution / changelog)

Relevant issues

Fixes #25335

What's broken

When cache_control_injection_points is passed via extra_body in the Responses API:

client.responses.create(
    model="claude-sonnet-4-6",
    input=messages,
    extra_body={
        "cache_control_injection_points": [
            {"location": "message", "role": "system", "index": 0},
            {"location": "message", "role": "user", "index": -1},
        ]
    },
)

…the AnthropicCacheControlHook never fires. The hook system checks top-level kwargs for cache_control_injection_points (via DynamicPromptManagementParamLiteral), but the Responses API keeps it nested inside extra_body — so should_run_prompt_management_hooks returns False and the injection never happens.

The same call works fine on the Chat Completions API because users pass cache_control_injection_points as a direct kwarg there.

Fix

Before the prompt management hooks run in both responses() and aresponses(), extract any DynamicPromptManagementParam keys from extra_body into kwargs. This mirrors how the Chat Completions path already receives these params.

The extraction is conservative: it only moves keys that are in the DynamicPromptManagementParamLiteral enum, doesn't overwrite existing kwargs, and does nothing if extra_body is not a dict.

Tests

Two unit tests added covering:

• Extraction moves the key and removes it from extra_body
• Existing kwargs are not overwritten

All 18 tests in test_anthropic_cache_control_hook.py pass.

Pre-Submission checklist

• I have Added testing in the tests/test_litellm/ directory
• My PR passes all unit tests on make test-unit (tested locally: 18/18 passed)
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🐛 Bug Fix ✅ Test

Changed files

• litellm/responses/main.py (modified, +28/-0)
• tests/test_litellm/integrations/test_anthropic_cache_control_hook.py (modified, +42/-0)