```                   # 📋 Session Report
    λλ              
   λ⊙λ⊙             
  λλλλλλ            
 λλλλλλλλ           
    λλ              
    λλ              
    λλ              
    λλ              
    λλ              
    λλ              
    λλ              
    λλ              
```                 

**🔑 Session ID:** 23f4a991-19d0-401a-a4fd-9dd3c94e5f0f

---

## 📊 Statistics

### Turn Counts

| Metric | Value |
|--------|-------|
| Total Turns | 46 |
| 👤 User Turns | 23 |
| 🤖 LLM Turns | 23 |

### 🔧 Tool Calls

**Total Tool Calls:** 22

`bash_read-file      `   11 ████████████████████████████████████████████████████████████

`bash_check-code     `    4 █████████████████████

`bash_write-file     `    4 █████████████████████

`bash_grep-files     `    2 ██████████

`bash_list-files     `    1 █████


### 💾 Byte Usage

`Input     `    310 KiB ████████████████████████████████████████████████████████████

`Output    `      1 KiB 

`Reasoning `      5 KiB 
**Total:** 317 KiB

---

## 👤 Step 1: User Turn

### 📝 System Prompt

```
You are an expert Haskell and Bash programmer specialized in writing clean, idiomatic, and efficient Haskell code.
When writing Bash code:
- Avoid bash-specific logic but bash-ism are fine.
- Document required shell tools at the top of the bash script.
When writing Haskell code:
- Use modern Haskell practices (base >= 4.14)
- Prefer pure functions and explicit type signatures
- Use standard libraries when appropriate
- Add clear comments for complex logic
- Follow consistent formatting
Use list-files to explore the project structure, read-file to understand existing code, write-file to create or modify files, and check-code to verify your work.
Always compile code before considering the job done.
Your output format may be stored as commit message: hence the first line of your last message should be a summary line.
```

### 💬 User Query

# Gracefully handle and retry moonshot 429 errors

Moonshot/Kimi has the following behaviour when receiving too many requests, and no rate-limit headers before.

When receiving a 429 with error message matching "overloaded", we should trigger a wait and a retry in the `src/System/Agents/LLMs/OpenAI.hs` module.

We should have some backoffs like 1min, 9min, 20min then failure. Add a Trace for this backoff.


# supporting resource


example doc:

```console
 (Response {responseStatus = Status {statusCode = 429, statusMessage = "Too Many Requests"}, responseVersion = HTTP/1.1, responseHeaders = [("Date","Tue, 17 Mar 2026 13:06:55 GMT"),("Content-Type","application/json; charset=utf-8"),("Content-Length","115"),("Connection","keep-alive"),("Server-Timing","cfCacheStatus;desc=\"DYNAMIC\""),("Server-Timing","cfEdge;dur=17,cfOrigin;dur=2033"),("Msh-Gid","enterprise-tier-3"),("Msh-Org-Id","org-79a7ceaf5a8040e6baef25ec0bbad1d9"),("Msh-Project-Id","proj-f9b0e4f1319044829319394c33b4e5a6"),("Msh-Request-Id","2b1ff8fa-2202-11f1-b57e-00163e3c375f"),("Msh-Trace-Mode","on"),("Msh-Uid","d5tu9rqmvvhpeopn1thg"),("Vary","Origin"),("X-Msh-Trace-Id","6de69f2ac5cc18209289591569fe3d02"),("Strict-Transport-Security","max-age=31536000; includeSubDomains"),("cf-cache-status","DYNAMIC"),("Server","cloudflare"),("CF-RAY","9ddc37aae863d10d-CDG")], responseBody = "{\"error\":{\"message\":\"The engine is currently overloaded, please try again later\",\"type\":\"engine_overloaded_error\"}}", responseCookieJar = CJ {expose = []}, responseClose' = ResponseClose, responseOriginalRequest = Request {
  host                 = "api.moonshot.ai"
  port                 = 443
  secure               = True
  requestHeaders       = [("Authorization","<REDACTED>"),("User-Agent","haskell-http-client+agents-exe"),("Content-Type","application/json")]
  path                 = "/v1/chat/completions"
  queryString          = ""
  method               = "POST"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
  proxySecureMode      = ProxySecureWithConnect
}
```

---
From #336



### 🛠️ Available Tools

- **bash_grep-files** (`bash_grep-files`)
  - Description: Search for a pattern in files using 'git grep'
- **bash_read-file** (`bash_read-file`)
  - Description: Read the contents of a file
- **bash_check-code** (`bash_check-code`)
  - Description: Check Haskell code by compiling or testing
- **bash_list-files** (`bash_list-files`)
  - Description: List all files in the project
- **bash_write-file** (`bash_write-file`)
  - Description: Write content to a file

---

## 🤖 Step 2: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Let me start by exploring the project structure and understanding the existing code in the OpenAI module.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_list-files**

---

## 👤 Step 3: User Turn



---

## 🤖 Step 4: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Let me read the main OpenAI LLM module to understand the existing code structure and how requests are handled.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 5: User Turn



---

## 🤖 Step 6: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now let me look at the HttpClient module to understand how requests are made and how errors are handled. I also want to see the Trace module to understand how tracing works.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 7: User Turn



---

## 🤖 Step 8: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now let me look at the TraceUtils module to understand how tracing works:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 9: User Turn



---

## 🤖 Step 10: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now let me check how the `callLLMPayload` is called and where the error handling happens. I need to look at the Runtime module and the Session modules to understand the full flow.
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 11: User Turn



---

## 🤖 Step 12: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Let me read the Runtime/Runtime.hs and Runtime/Trace.hs files:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 13: User Turn



---

## 🤖 Step 14: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now let me look at how LLM calls are made in the Session/OpenAI.hs module:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 15: User Turn



---

## 🤖 Step 16: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now I understand the structure. The issue is in the `callLLMPayload` function in `src/System/Agents/LLMs/OpenAI.hs`. Currently it doesn't handle 429 errors specifically for the Moonshot/Kimi "overloaded" case.

Looking at the example doc:
- Status code: 429
- Error message: "The engine is currently overloaded, please try again later"
- Error type: "engine_overloaded_error"

I need to:
1. Parse the error response from 429 errors
2. Check if it contains "overloaded" in the message
3. Implement a retry mechanism with backoff: 1min, 9min, 20min, then failure
4. Add a new Trace constructor for this backoff

Let me check how to parse the error response. The HttpClient returns an error as `Left (HttpClient.SomeError err)` but looking at the HttpClient, it doesn't actually check for HTTP status codes - it just returns the response. The response handling needs to be updated to check for 429 status code.

Let me check if there's already a way to handle status codes:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_grep-files**

---

## 👤 Step 17: User Turn



---

## 🤖 Step 18: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I see that other parts of the code check `HttpClient.responseStatus`. However, looking at the HttpClient code, it seems like it doesn't return errors for non-2xx status codes - it just returns the response as-is.

Let me check if the HttpClient module actually checks for status codes:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_grep-files**

---

## 👤 Step 19: User Turn



---

## 🤖 Step 20: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Interesting, it seems HttpClient doesn't explicitly check status codes. Looking at the http-client library, by default it doesn't throw exceptions for non-2xx status codes unless `checkResponse` is set. So the response body should contain the error.

Let me trace the flow:
1. `callLLMPayload` calls `rt.post` which returns `Either ScoopError (Response LByteString.ByteString)`
2. Looking at the HttpClient code, it always returns `Right rsp` (the error type is never used for HTTP errors, just for request building failures)
3. The response body is then decoded with `decodeBody`

So I need to:
1. Check the response status code after getting the response
2. If it's 429, parse the error body to check for "overloaded" message
3. Implement retry logic with backoff

Let me look at the imports in OpenAI.hs and understand the structure better. I'll need to:
1. Import Network.HTTP.Types.Status for status code checking
2. Add a new Trace constructor for the overloaded backoff
3. Create a retry mechanism in `callLLMPayload`

Let me also check the cabal file to see what dependencies are available:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 21: User Turn



---

## 🤖 Step 22: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Good, I can see that `http-types` is available. Now let me implement the changes:

1. Add a new Trace constructor `OverloadedBackoff` to track the retry attempts
2. Add a data type for the error response from Moonshot/Kimi
3. Modify `callLLMPayload` to handle 429 errors with "overloaded" message
4. Implement retry logic with backoff: 1min, 9min, 20min, then failure

Let me write the updated OpenAI.hs file:
</details>

### 💬 Response

Now I have a clear understanding of the code structure. Let me implement the 429 overloaded error handling with retry logic. I need to:

1. Add a new Trace constructor for the backoff
2. Parse 429 error responses to detect "overloaded" messages
3. Implement retry logic with backoff: 1min, 9min, 20min, then failure

### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 23: User Turn



---

## 🤖 Step 24: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I need to remove the old `callLLMPayload'` function that I accidentally left in the code. Let me fix that:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 25: User Turn



---

## 🤖 Step 26: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I see there's still a leftover `callLLMPayload'` function from my initial draft. I need to remove it and also remove the unused import `Control.Monad (when)`. Let me fix this:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 27: User Turn



---

## 🤖 Step 28: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now let me compile the code to make sure it works:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_check-code**

---

## 👤 Step 29: User Turn



---

## 🤖 Step 30: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I need to update the CLI/TraceUtils.hs file to handle the new `OverloadedBackoff` trace constructor. Let me check what needs to be done:
</details>

### 💬 Response

I need to update the `CLI/TraceUtils.hs` file to handle the new `OverloadedBackoff` trace constructor. Let me check that file:

### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 31: User Turn



---

## 🤖 Step 32: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I see the issue. The `renderConversationAgentTrace` function uses a `case` statement that doesn't handle the new `OverloadedBackoff` constructor. I need to add a case for it. Let me update this file:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 33: User Turn



---

## 🤖 Step 34: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now let me compile again to verify everything works:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_check-code**

---

## 👤 Step 35: User Turn



---

## 🤖 Step 36: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

There's another place that needs updating - the app/Main.hs file. Let me check it:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 37: User Turn



---

## 🤖 Step 38: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I can see the issue. At line 1561, there's a pattern match that doesn't cover the new `OverloadedBackoff` constructor. Looking at the code, I need to add a case for the new constructor in the `encodeBaseTrace_Conversation` function. Let me look at the specific location.

Let me search for line 1561 to understand the context better:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 39: User Turn



---

## 🤖 Step 40: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

I found the issue - the `encodeBaseTrace_Conversation` function has a case statement that doesn't handle `LLMTrace.OverloadedBackoff`. I need to add a case for this. Let me update the file:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 41: User Turn



---

## 🤖 Step 42: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

Now let me compile again to verify everything works:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_check-code**

---

## 👤 Step 43: User Turn



---

## 🤖 Step 44: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

The code compiles successfully. Now let me run the tests to make sure everything is working properly:
</details>

### 💬 Response

Now let me run the tests to ensure everything works correctly:

### 🔧 Tool Calls

- **bash_check-code**

---

## 👤 Step 45: User Turn



---

## 🤖 Step 46: LLM Turn

### 💭 Thinking Process

<details>
<summary>Click to expand reasoning</summary>

All 310 tests passed. Let me provide a summary of the changes I made to implement the graceful handling and retry of Moonshot 429 errors.
</details>

### 💬 Response

All 310 tests pass. Here's a summary of the changes made:

## Summary

Added graceful handling and retry logic for Moonshot/Kimi 429 "overloaded" errors in `src/System/Agents/LLMs/OpenAI.hs`.

### Changes to `src/System/Agents/LLMs/OpenAI.hs`:

1. **Added new `Trace` constructor**: `OverloadedBackoff !Int !Int` - tracks retry attempt number and delay in seconds

2. **Added `OverloadedError` data type**: Parses Moonshot/Kimi error responses with fields for message and error type

3. **Added `isOverloadedError` function**: Detects overloaded conditions by checking:
   - If the error message contains "overloaded" (case-insensitive)
   - Or if the error type is "engine_overloaded_error"

4. **Added backoff delays**: `[60, 540, 1200]` seconds (1min, 9min, 20min)

5. **Refactored `callLLMPayload`**: Now implements retry logic:
   - Checks for HTTP 429 status code with overloaded error body
   - Waits with exponential backoff (1min → 9min → 20min)
   - Emits `OverloadedBackoff` trace events for visibility
   - Returns error after 3 failed attempts

### Changes to `src/System/Agents/CLI/TraceUtils.hs`:

- Added handling for `OverloadedBackoff` trace in both `tracePrintingTextResponses` and `renderConversationAgentTrace`
- Displays user-friendly message: "moonshot/kimi overloaded: retry N in Xs"

### Changes to `app/Main.hs`:

- Added JSON encoding for `OverloadedBackoff` trace events with fields for attempt number and delay seconds
