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Accept prompt_cache_key in Responses API requests - #3052
Allow prompt_cache_key in the OpenAI-compatible responses request model and propagate it through internal ResponsesApiParams so it reaches OGX requests. This prevents 422 validation failures for clients that send provider prompt-cache hints.
Goose version v1.56 is sending a the prompt_cache_key parameter in the request and lightspeed-stack now handles it.
$ curl -X POST "http://localhost:8080/v1/responses" -H "Content-Type: application/json" -d '{"prompt_cache_key": "test-key", "input": "hello there"}'
{"created_at":1793189679,"completed_at":1793189681,"error":null,"id":"resp_35896a97-39ad-4203-964b-6671c7f53358","model":"gpt-5.6-luna","object":"response","output":[{"content":[{"text":"Hello! How can I help you today?","type":"output_text","annotations":[],"logprobs":[]}],"role":"assistant","type":"message","id":"msg_352e5281-ba26-469c-8996-a71f3073e74b","status":"completed"}],"parallel_tool_calls":true,"previous_response_id":null,"prompt_cache_key":"test-key","prompt":null,"status":"completed","temperature":1.0,"text":{"format":{"type":"text"},"verbosity":"medium"},"top_p":1.0,"tools":[],"tool_choice":"auto","truncation":"disabled","usage":{"input_tokens":17,"output_tokens":12,"total_tokens":29,"input_tokens_details":{"cached_tokens":0},"output_tokens_details":{"reasoning_tokens":0}},"instructions":"<server prompt applied>","max_tool_calls":30,"reasoning":null,"max_output_tokens":null,"safety_identifier":null,"metadata":null,"store":true,"conversation":"090ba48aa3e6739134f026c527d3339befb65e73dc53a1d6","available_quotas":{},"output_text":"Hello! How can I help you today?"}
And just to confirm, when passing an unsupported key:
$ curl -X POST "http://localhost:8080/v1/responses" -H "Content-Type: application/json" -d '{"unsupported-key": "test-key", "input": "hello there"}'
{"detail":[{"type":"extra_forbidden","loc":["body","unsupported-key"],"msg":"Extra inputs are not permitted","input":"test-key"}]}
Summary by CodeRabbit
New Features
API requests can now include an optional prompt cache key.
The supplied key is included in the parameters echoed back in responses. This provides a consistent way to see the key alongside the request’s other echoed parameters.
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Using config file .github/pr-title-checker-config.json from repo lightspeed-core/lightspeed-stack [ref: 16e5c2b0ca103b7dab16b99dbf620592240772f5]
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Using config file .github/pr-title-checker-config.json from repo lightspeed-core/lightspeed-stack [ref: 16e5c2b0ca103b7dab16b99dbf620592240772f5]
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GitHub Actions: E2E Tests / 1_E2E server _ ci _ mcp.txt: Accept prompt_cache_key in Responses API requests
##[group]Run # Debug: Check if environment variable is available for docker-compose
�[36;1m# Debug: Check if environment variable is available for docker-compose�[0m
�[36;1mecho "OPENAI_API_KEY is set: $([ -n "$OPENAI_API_KEY" ] && echo 'YES' || echo 'NO')"�[0m
�[36;1mecho "OPENAI_API_KEY length: ${#OPENAI_API_KEY}"�[0m
�[36;1m�[0m
�[36;1mdocker compose version�[0m
�[36;1mdocker compose up -d�[0m
�[36;1m�[0m
�[36;1m# Check for errors and show logs if any services failed�[0m
�[36;1mif docker compose ps | grep -E 'Exit|exited|stopped'; then�[0m
�[36;1m echo "Some services failed to start - showing logs:"�[0m
�[36;1m docker compose logs�[0m
�[36;1m exit 1�[0m
�[36;1melse�[0m
�[36;1m echo "All services started successfully"�[0m
�[36;1mfi�[0m
shell: /usr/bin/bash -e {0}
env:
OPENAI_***REDACTED_SECRET_ASSIGNMENT***
E2E_OPENAI_MODEL: gpt-5.6-luna
E2E_DEPLOYMENT_MODE: server
FAISS_VECTOR_STORE_ID: vs_8c94967b-81cc-4028-a294-9cfac6fd9ae2
E2E_OGX_HOSTNAME: ogx
E2E_LLAMA_HOSTNAME: llama-stack
HF_CACHE_PATH: /tmp/hf-cache
##[endgroup]
OPENAI_API_KEY is set: YES
OPENAI_API_KEY length: 167
Docker Compose version v2.38.2
time="" level=warning msg="The \"RHAIIS_URL\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHAIIS_PORT\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHAIIS_API_KEY\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHAIIS_MODEL\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHEL_AI_URL\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHEL_AI_PORT\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHEL_AI_API_KEY\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHEL_AI_MODEL\" variable is not set. Defaulting to a blank string."
#1 [internal] lo...
GitHub Actions: E2E Tests / 3_E2E server _ ci _ shields.txt: Accept prompt_cache_key in Responses API requests
##[group]Run # Debug: Check if environment variable is available for docker-compose
�[36;1m# Debug: Check if environment variable is available for docker-compose�[0m
�[36;1mecho "OPENAI_API_KEY is set: $([ -n "$OPENAI_API_KEY" ] && echo 'YES' || echo 'NO')"�[0m
�[36;1mecho "OPENAI_API_KEY length: ${#OPENAI_API_KEY}"�[0m
�[36;1m�[0m
�[36;1mdocker compose version�[0m
�[36;1mdocker compose up -d�[0m
�[36;1m�[0m
�[36;1m# Check for errors and show logs if any services failed�[0m
�[36;1mif docker compose ps | grep -E 'Exit|exited|stopped'; then�[0m
�[36;1m echo "Some services failed to start - showing logs:"�[0m
�[36;1m docker compose logs�[0m
�[36;1m exit 1�[0m
�[36;1melse�[0m
�[36;1m echo "All services started successfully"�[0m
�[36;1mfi�[0m
shell: /usr/bin/bash -e {0}
env:
OPENAI_***REDACTED_SECRET_ASSIGNMENT***
E2E_OPENAI_MODEL: gpt-5.6-luna
E2E_DEPLOYMENT_MODE: server
FAISS_VECTOR_STORE_ID: vs_8c94967b-81cc-4028-a294-9cfac6fd9ae2
E2E_OGX_HOSTNAME: ogx
E2E_LLAMA_HOSTNAME: llama-stack
HF_CACHE_PATH: /tmp/hf-cache
##[endgroup]
OPENAI_API_KEY is set: YES
OPENAI_API_KEY length: 167
Docker Compose version v2.38.2
time="" level=warning msg="The \"RHAIIS_URL\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHAIIS_PORT\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHAIIS_API_KEY\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHAIIS_MODEL\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHEL_AI_URL\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHEL_AI_PORT\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHEL_AI_API_KEY\" variable is not set. Defaulting to a blank string."
time="" level=warning msg="The \"RHEL_AI_MODEL\" variable is not set. Defaulting to a blank string."
#1 [internal] lo...
GitHub Actions: E2E Tests / 14_E2E library _ ci _ mcp.txt: Accept prompt_cache_key in Responses API requests
Also applies to: 20932-20932, 20939-20939, 21047-21057, 21324-21324
Walkthrough
The Responses request and shared parameter models add an optional prompt_cache_key. The field is included in echoed parameters and added to the response model and OpenAPI schema.
Changes
Prompt cache key support
Layer / File(s)
Summary
Define and echo the prompt cache key src/models/api/requests/responses_openai.py, src/models/common/responses/responses_api_params.py, tests/unit/models/requests/test_responses_request.py
The request and shared parameter models add an optional prompt_cache_key field. The shared parameter model adds it to _ECHOED_FIELDS. A test checks that request validation preserves the field.
Add the prompt cache key to responses src/models/api/responses/successful/responses_openai.py, docs/devel_doc/openapi.json
The response model and OpenAPI schema add and document an optional prompt_cache_key. The OpenAPI request example includes a sample value.
Prompt-cache keys are accepted and preserved across the supported Responses API paths.
Pre-merge checks: 7
Check name
Status
Explanation
Description Check
Check skipped - CodeRabbit’s high-level summary is enabled.
Title check
The title clearly and concisely describes the main change: accepting prompt_cache_key in Responses API requests.
Docstring Coverage
No eligible functions found in the changed files. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Linked Issues check
Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
Check skipped because no linked issues were found for this pull request.
Performance And Algorithmic Complexity
PASSED. The pull request adds scalar optional fields, schema metadata, and one echoed-field entry. Request conversion uses existing Pydantic model validation and serialization; it adds no nested loops…
Security And Secret Handling
PASSED. The pull request only adds an optional string field and propagates it through existing Responses API models. The example value is non-secret (example-cache-key), and no token, password, comm…
Full details: Docstring Coverage
Explanation
No eligible functions found in the changed files. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 0 functions across 4 files. (1 skipped: 1 unsupported.)
Full details: Performance And Algorithmic Complexity
Explanation
PASSED. The pull request adds scalar optional fields, schema metadata, and one echoed-field entry. Request conversion uses existing Pydantic model validation and serialization; it adds no nested loops, per-item API or database calls, unbounded state, or list endpoint behavior. The existing tool loop is unchanged.
Full details: Security And Secret Handling
Explanation
PASSED. The pull request only adds an optional string field and propagates it through existing Responses API models. The example value is non-secret (example-cache-key), and no token, password, command, SQL, or path operation was added. The existing /responses endpoint retains @authorize(Action.RESPONSES) and Depends(get_auth_dependency()). The response echo returns the client-provided cache key, not a server secret. No Kubernetes files changed, so OwnerReferences are not affected.
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Actionable comments posted: 1
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Inline comments:
Review comments at @src/models/common/responses/responses_api_params.py:
- Line 36: Declare prompt_cache_key as an optional field on ResponsesResponse so
model_construct() preserves the echoed request parameter and the generated
response schema includes it; add a regression test covering a blocked streaming
response with prompt_cache_key.
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configuration_path: .github/pr-title-checker-config.json
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Using config file .github/pr-title-checker-config.json from repo lightspeed-core/lightspeed-stack [ref: dd9f1d8b5628f022faff1f2da3a5c3e7a6c9a212]
(node:2425) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
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(node:2425) [DEP0169] DeprecationWarning: `url.parse()` behavior is not standardized and prone to errors that have security implications. Use the WHATWG URL API instead. CVEs are not issued for `url.parse()` vulnerabilities.
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##[group]Run thehanimo/pr-title-checker@v1.4.3
with:
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pass_on_octokit_error: false
configuration_path: .github/pr-title-checker-config.json
##[endgroup]
Using config file .github/pr-title-checker-config.json from repo lightspeed-core/lightspeed-stack [ref: dd9f1d8b5628f022faff1f2da3a5c3e7a6c9a212]
(node:2425) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
(node:2425) [DEP0169] DeprecationWarning: `url.parse()` behavior is not standardized and prone to errors that have security implications. Use the WHATWG URL API instead. CVEs are not issued for `url.parse()` vulnerabilities.
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GitHub Actions: OpenAPI (Spectral) / 0_spectral.txt: Accept prompt_cache_key in Responses API requests
Allow prompt_cache_key in the OpenAI-compatible responses request model
and propagate it through internal ResponsesApiParams so it reaches OGX
requests. This prevents 422 validation failures for clients that send
provider prompt-cache hints.
Goose version v1.56 is sending a the prompt_cache_key parameter in the
request and lightspeed-stack now handles it.
OGX already has it implemented:
ogx-ai/ogx@8b3da72
Resolves: OSPRH-39974
Signed-off-by: Lucas Alvares Gomes <lucasagomes@gmail.com>
$ curl -X POST "http://localhost:8080/v1/responses" -H "Content-Type: application/json" -d '{"prompt_cache_key": "test-key", "input": "hello there"}'
{"created_at":1793189679,"completed_at":1793189681,"error":null,"id":"resp_35896a97-39ad-4203-964b-6671c7f53358","model":"gpt-5.6-luna","object":"response","output":[{"content":[{"text":"Hello! How can I help you today?","type":"output_text","annotations":[],"logprobs":[]}],"role":"assistant","type":"message","id":"msg_352e5281-ba26-469c-8996-a71f3073e74b","status":"completed"}],"parallel_tool_calls":true,"previous_response_id":null,"prompt_cache_key":"test-key","prompt":null,"status":"completed","temperature":1.0,"text":{"format":{"type":"text"},"verbosity":"medium"},"top_p":1.0,"tools":[],"tool_choice":"auto","truncation":"disabled","usage":{"input_tokens":17,"output_tokens":12,"total_tokens":29,"input_tokens_details":{"cached_tokens":0},"output_tokens_details":{"reasoning_tokens":0}},"instructions":"<server prompt applied>","max_tool_calls":30,"reasoning":null,"max_output_tokens":null,"safety_identifier":null,"metadata":null,"store":true,"conversation":"090ba48aa3e6739134f026c527d3339befb65e73dc53a1d6","available_quotas":{},"output_text":"Hello! How can I help you today?"}
And just to confirm, when passing an unsupported key:
$ curl -X POST "http://localhost:8080/v1/responses" -H "Content-Type: application/json" -d '{"unsupported-key": "test-key", "input": "hello there"}'
{"detail":[{"type":"extra_forbidden","loc":["body","unsupported-key"],"msg":"Extra inputs are not permitted","input":"test-key"}]}
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Description
Allow prompt_cache_key in the OpenAI-compatible responses request model and propagate it through internal ResponsesApiParams so it reaches OGX requests. This prevents 422 validation failures for clients that send provider prompt-cache hints.
Goose version v1.56 is sending a the prompt_cache_key parameter in the request and lightspeed-stack now handles it.
OGX already has it implemented:
ogx-ai/ogx@8b3da72
Resolves: OSPRH-39974
Type of change
pyproject.toml+uv.lock]requirements.*.txtfor Konflux]Tools used to create PR
Identify any AI code assistants used in this PR (for transparency and review context)
Related Tickets & Documents
Checklist before requesting a review
Testing
Run the following and verify the request does not fail
$ curl -X POST https://lightspeed-app-server.openstack-lightspeed.svc:8443/v1/responses -H "Content-Type: application/json" -H "Authorization: Bearer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" -k -d '{"prompt_cache_key": "foo-key", "input": "what is Lightspeed ?"}'
Tested the code locally:
And just to confirm, when passing an unsupported key:
Summary by CodeRabbit