fix(chat): accept developer messages in /v1/chat/completions - #1047
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fix(chat): accept developer messages in /v1/chat/completions#1047ormandj wants to merge 1 commit into
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📝 WalkthroughWalkthroughThe gateway now accepts ChangesDeveloper role contract and internal processing
OpenAI role serialization policy
Provider-specific developer translation
Cross-provider and SDK validation
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to This change enables developer messages but can still reject valid requests on Vertex partner routes, and its compatibility tests may be skipped when setup is unavailable. The translation issue and test setup should be fixed before merging. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant ChatClient
participant Gateway
participant ProviderBridge
participant ProviderWire
participant Upstream
ChatClient->>Gateway: send developer and user messages
Gateway->>ProviderBridge: route chat request
ProviderBridge->>ProviderWire: select developer role mode
ProviderWire->>Upstream: send preserved developer or mapped system role
``
</details>
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<details>
<summary>🚥 Pre-merge checks | ✅ 2</summary>
<details>
<summary>✅ Passed checks (2 passed)</summary>
| Check name | Status | Explanation |
| :---------------------: | :------- | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| E2e Test Quality Review | ✅ Passed | PASS — The PR adds real E2E coverage through the official OpenAI SDK, a spawned gateway, etcd-seeded configuration, and an upstream HTTP test service. The tests verify developer-role forwarding for no… |
| Security Check | ✅ Passed | PASS. The diff adds developer-role parsing, provider translation, cache fingerprinting, rendering, token accounting, and tests. It does not add credential logging, secret persistence, mutating endpoin… |
</details>
<details>
<summary>Full details: E2e Test Quality Review</summary>
**Explanation**
PASS — The PR adds real E2E coverage through the official OpenAI SDK, a spawned gateway, etcd-seeded configuration, and an upstream HTTP test service. The tests verify developer-role forwarding for non-streaming and streaming requests, exact upstream message bodies, reconstructed stream content, and rejection of mis-cased roles before the upstream. Readiness gating follows the E2E harness rules. Baseline request counts isolate each test, assertions use structured JSON, and no catch-all error handling or hidden test dependency is introduced. The provider mappings also have targeted integration and unit coverage. All changed files are relevant to the developer-role feature.
</details>
<details>
<summary>Full details: Security Check</summary>
**Explanation**
PASS. The diff adds developer-role parsing, provider translation, cache fingerprinting, rendering, token accounting, and tests. It does not add credential logging, secret persistence, mutating endpoints, permission checks, cross-resource access, TLS changes, shared-resource operations, or secret-reference handling. Credential-looking values occur only in test fixtures. Cache keys remain hashed and retain policy and API-key scope. 1. Sensitive Data Exposure in Logs & Responses — No issues found. 2. Secrets Stored Unencrypted in Database — No issues found. 3. Authorization & Permission Bypass — No issues found. 4. Cross-Resource Access / Missing Ownership Validation — No issues found. 5. TLS / Cryptographic Configuration Errors — No issues found. 6. Resource Isolation & Shared Resource Safety — No issues found. 7. Secret Reference Resolution — No issues found.
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<summary>✨ Finishing Touches</summary>
<details>
<summary>🧪 Generate unit tests (beta)</summary>
- [ ] <!-- {"checkboxId": "f47ac10b-58cc-4372-a567-0e02b2c3d479", "radioGroupId": "utg-output-choice-group-unknown_comment_id"} --> Create PR with unit tests
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Actionable comments posted: 2
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Inline comments:
In `@crates/aisix-provider-vertex/src/bridge.rs`:
- Around line 1215-1216: Update the Vertex partner request construction around
openai_messages_from and build_openai_request to use the provider-specific role
translation that maps developer/system content to supported user or assistant
roles, ensuring the first message is user for Llama and Mistral. Apply this
consistently across OpenAI-shim and partner rawPredict streaming and
non-streaming paths, and update affected assertions to match the translated
roles.
In `@tests/e2e/src/cases/openai-sdk-compat.test.ts`:
- Around line 145-149: Remove the conditional ctx.skip() setup paths from both
developer-role compatibility tests in
tests/e2e/src/cases/openai-sdk-compat.test.ts at lines 145-149 and 182-186;
ensure missing etcdReachable, app, or nonStreamUpstream causes explicit setup
failure or make the required E2E dependencies available, so both tests always
execute their assertions.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (13)
crates/aisix-cache/src/key.rscrates/aisix-gateway/src/chat.rscrates/aisix-provider-anthropic/src/wire.rscrates/aisix-provider-azure-openai/src/bridge.rscrates/aisix-provider-bedrock/src/bridge.rscrates/aisix-provider-openai/src/bridge.rscrates/aisix-provider-openai/src/wire.rscrates/aisix-provider-vertex/src/bridge.rscrates/aisix-proxy/src/ensemble.rscrates/aisix-proxy/src/lib.rscrates/aisix-proxy/src/render.rscrates/aisix-proxy/src/token_estimate.rstests/e2e/src/cases/openai-sdk-compat.test.ts
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Problem
OpenAI defines
developermessages as application-provided instructions that are prioritized ahead of user messages and carry the application's rules and business logic (OpenAI message-role guidance). OpenAI's reasoning-model guidance states that, beginning witho1-2024-12-17, reasoning models use developer messages in place of system messages (OpenAI reasoning guidance).Clients therefore emit this role when sending application-level instructions to reasoning-capable models. Pi v0.84.3, for example, documents that it uses
developerfor reasoning-capable models and sends the system prompt assystemonly whencompat.supportsDeveloperRoleis disabled (Pi model configuration).AISIX currently rejects such requests during deserialization. A Pi request containing a developer message produces:
Supporting the role at the normalized request boundary is required for compatibility with these clients. Provider bridges can then preserve or translate it according to the upstream provider's message contract.
Change
developerto the normalized chat-message roles.developerfor canonical OpenAI chat-completion requests.systemfor OpenAI-compatible providers whose contracts do not support it directly.Provider-specific translations follow the documented request contracts for DeepSeek, Azure OpenAI, Anthropic, Gemini, and Amazon Bedrock.
For Anthropic, developer messages are combined into the top-level
systeminstruction because its Messages API does not define message-level system or developer roles.Gateway comparison
developeras an OpenAI chat-message role (source).developertosystemwhen the destination model does not support the role (source).Verification
cargo fmt --checkcargo check --workspace --all-targetscargo clippy --workspace -- -D warningsenv -u AISIX_API_KEY cargo test --workspacenpx --yes pnpm@11 exec vitest run src/cases/openai-sdk-compat.test.tsPrepared with AI assistance
Summary by CodeRabbit
New Features
developerchat message role.Bug Fixes
Tests