feat(provider): add kimi-for-coding provider

[beyond-infra]

Summary

Add support for Kimi for Coding (Moonshot AI Coding Plan) via their Anthropic-compatible endpoint at https://api.kimi.com/coding.

Key Changes

• New provider: kimi-for-coding with KIMI_API_KEY env var
• Shared base class: Extract AnthropicCompatibleProvider to eliminate ~60 lines of duplication with MinimaxProvider
• User-Agent workaround: Kimi rejects default Anthropic SDK User-Agent with HTTP 429; we pass KimiCLI/1.5
• describeImage support: Added to both KimiForCodingProvider and MinimaxProvider (was missing)

Env Vars

Variable	Required	Default
KIMI_API_KEY	Yes	—
KIMI_BASE_URL	No	https://api.kimi.com/coding
KIMI_MODEL	No	kimi-k2

Tests

• test/kimi-for-coding-provider.test.ts — base URL resolution (default + env override)
• test/kimi-for-coding-e2e.test.ts — mock fetch verifies headers, body shape, and error handling

Compatibility Notes

This PR touches src/types.ts (ProviderType) and src/providers/index.ts (createBaseProvider), which may conflict with other open provider PRs:

• feat(providers): add openai provider with custom base_url support #385 (openai provider)
• feat: add OpenAI-compatible LLM provider #307 (OpenAI-compatible LLM provider v2)

If any of these merge first, this PR will need a rebase.

Additionally, #379 (AbortController timeout) adds fetchWithTimeout to minimax.ts. Since this PR extracts a shared AnthropicCompatibleProvider base class, the timeout logic from #379 should ideally be merged into the base class rather than per-provider. Happy to coordinate with #379's author if both PRs are accepted.

Verification

• npm run build passes
• New tests pass (11/11)
• Prettier formatted
• DCO sign-off

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📝 Walkthrough

Walkthrough

Introduces AnthropicCompatibleProvider, a reusable base class for Anthropic-compatible APIs with compress, summarize, and image description. Adds KimiForCodingProvider as its first consumer, refactors MinimaxProvider to extend it, and updates the provider registry. Tests cover request/response behavior and environment-driven configuration.

Changes

Anthropic-Compatible Provider Abstraction and Kimi Integration

Layer / File(s)	Summary
AnthropicCompatibleProvider base class src/providers/anthropic-compatible.ts	Defines the reusable AnthropicCompatibleProvider with configurable API key, model, base URL, and headers. Implements compress, summarize, and describeImage methods that delegate to shared request/response handling: posting to /v1/messages, parsing JSON for the first text content block, and throwing formatted errors on non-OK responses.
KimiForCodingProvider and provider registry wiring src/providers/kimi-for-coding.ts, src/providers/index.ts, src/types.ts	Extends AnthropicCompatibleProvider to support Kimi's coding API with base URL from KIMI_BASE_URL (default: https://api.kimi.com/coding) and whitelisted User-Agent header. Adds kimi-for-coding to the provider type union and extends the factory to instantiate it with the required API key.
MinimaxProvider refactoring to extend AnthropicCompatibleProvider src/providers/minimax.ts	Removes MinimaxProvider's custom compress, summarize, and private call implementation. Converts the class to extend AnthropicCompatibleProvider, delegating request/response handling to the base class and preserving the existing MINIMAX_BASE_URL default.
KimiForCodingProvider tests test/kimi-for-coding-e2e.test.ts, test/kimi-for-coding-provider.test.ts	E2e test validates endpoint, headers, payload shape, and error handling (429 responses). Unit tests verify base URL resolution: default behavior and KIMI_BASE_URL override.

Sequence Diagram

sequenceDiagram
  participant Client
  participant KimiProvider as KimiForCodingProvider
  participant BaseProvider as AnthropicCompatibleProvider
  participant KimiAPI as Kimi /v1/messages
  
  Client->>KimiProvider: summarize(systemPrompt, userPrompt)
  KimiProvider->>BaseProvider: super.summarize(...)
  BaseProvider->>BaseProvider: Build headers + body
  BaseProvider->>KimiAPI: POST (auth, model, messages)
  KimiAPI-->>BaseProvider: JSON with content blocks
  BaseProvider->>BaseProvider: Extract first text block
  BaseProvider-->>KimiProvider: text result
  KimiProvider-->>Client: text result

Loading

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~22 minutes

Possibly related PRs

• rohitg00/agentmemory#103: Both PRs modify MiniMax provider behavior—feat: add MiniMax provider and fix ANTHROPIC_BASE_URL not passed to SDK #103 introduces a fetch-based MinimaxProvider and baseURL plumbing, while the main PR refactors src/providers/minimax.ts to extend the new AnthropicCompatibleProvider (removing its prior custom call/parsing logic).
• rohitg00/agentmemory#150: The main PR adds/rewires MemoryProvider.summarize implementations via AnthropicCompatibleProvider (and new kimi-for-coding/delegating MinimaxProvider), which the retrieved PR's new mem::compress-file tool depends on to generate the compressed Markdown.

Poem

🐰 A rabbit hops with glee so bright,
Anthropic shines in unified light!
Kimi joins the coding quest,
Minimax mirrors follow best—
One base, three providers in sight! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat(provider): add kimi-for-coding provider' directly and clearly summarizes the main change: adding a new provider for Kimi for Coding.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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