feat(ai): add Kimi For Coding provider support

- Add kimi-coding provider using Anthropic Messages API
- API endpoint: https://api.kimi.com/coding/v1
- Environment variable: KIMI_API_KEY
- Models: kimi-k2-thinking (text), k2p5 (text + image)
- Add context overflow detection pattern for Kimi errors
- Add tests for all standard test suites

packages/coding-agent/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- Added Kimi For Coding provider support (Moonshot AI's Anthropic-compatible coding API). Set `KIMI_API_KEY` environment variable. See [README.md#kimi-for-coding](README.md#kimi-for-coding).
+
 ## [0.50.2] - 2026-01-29
 
 ### New Features

packages/coding-agent/README.md

@@ -94,6 +94,7 @@ For each built-in provider, pi maintains a list of tool-capable models, updated
 - ZAI
 - OpenCode Zen
 - Hugging Face
+- Kimi For Coding
 - MiniMax
 
 See [docs/providers.md](docs/providers.md) for detailed setup instructions.

packages/coding-agent/docs/providers.md

@@ -63,6 +63,7 @@ pi
 | ZAI | `ZAI_API_KEY` |
 | OpenCode Zen | `OPENCODE_API_KEY` |
 | Hugging Face | `HF_TOKEN` |
+| Kimi For Coding | `KIMI_API_KEY` |
 | MiniMax | `MINIMAX_API_KEY` |
 | MiniMax (China) | `MINIMAX_CN_API_KEY` |
 

packages/coding-agent/src/cli/args.ts

@@ -280,6 +280,7 @@ ${chalk.bold("Environment Variables:")}
   ZAI_API_KEY                      - ZAI API key
   MISTRAL_API_KEY                  - Mistral API key
   MINIMAX_API_KEY                  - MiniMax API key
+  KIMI_API_KEY                     - Kimi For Coding API key
   AWS_PROFILE                      - AWS profile for Amazon Bedrock
   AWS_ACCESS_KEY_ID                - AWS access key for Amazon Bedrock
   AWS_SECRET_ACCESS_KEY            - AWS secret key for Amazon Bedrock

packages/coding-agent/src/core/model-resolver.ts

@@ -33,6 +33,7 @@ export const defaultModelPerProvider: Record<KnownProvider, string> = {
 	"minimax-cn": "MiniMax-M2.1",
 	huggingface: "moonshotai/Kimi-K2.5",
 	opencode: "claude-opus-4-5",
+	"kimi-coding": "kimi-k2-thinking",
 };
 
 export interface ScopedModel {