Add Claude + Gemini provider support, rename to LLMock#9
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Add handler modules for two new LLM provider APIs, both following the
established pattern from responses.ts: convert inbound request to
ChatCompletionRequest, match fixtures, convert response back to
provider-specific format.
Claude Messages API (/v1/messages):
- Streaming via event: type / data: json SSE format
- Non-streaming JSON responses
- Full message lifecycle: message_start through message_stop
- Tool use with input_json_delta streaming
- msg_ and toolu_ ID prefixes
Google Gemini GenerateContent API:
- /v1beta/models/{model}:generateContent (non-streaming)
- /v1beta/models/{model}:streamGenerateContent (streaming)
- data-only SSE format (no event prefix, no [DONE])
- functionCall/functionResponse round-trips with synthetic IDs
- FUNCTION_CALL finishReason for tool call responses
Also adds generateMessageId() and generateToolUseId() helpers,
server routes for both providers, and comprehensive tests.
Rename the project from @copilotkit/mock-openai to @copilotkit/llmock to reflect multi-provider scope (OpenAI, Anthropic, Google Gemini). - Class: MockOpenAI → LLMock - Files: mock-openai.ts → llmock.ts, mock-openai.test.ts → llmock.test.ts - Package: @copilotkit/mock-openai → @copilotkit/llmock - CLI: "Usage: mock-openai" → "Usage: llmock" - Binary: mock-openai → llmock - All imports, tests, and docs updated - Clean break — no backward-compat alias
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Apr 3, 2026
Add Claude + Gemini provider support, rename to LLMock
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Summary
POST /v1/messages) — streaming and non-streaming, tool use withinput_json_delta, full message lifecycle eventsPOST /v1beta/models/{model}:generateContentand:streamGenerateContent) — data-only SSE streaming,functionCall/functionResponseround-trips,FUNCTION_CALLfinish reason@copilotkit/llmock), CLI binary, all imports and tests. Clean break, no backward-compat alias.Both new providers follow the established pattern from
responses.ts: convert inbound request →ChatCompletionRequest→ match fixtures → convert response → provider-specific output. Same fixtures work across all 4 endpoints (completions, responses, messages, gemini).326 tests pass, lint clean, prettier clean.
Test plan
pnpm run test— 326 tests pass (12 test files)pnpm run lint— cleanpnpm run format:check— cleanpnpm run build— cleanMockOpenAIormock-openaireferences remain insrc/--helpshowsUsage: llmock