# Session Report

**Session ID:** 2b0cb943-95b0-4ec7-bfd9-8bdb3ab291b0

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## 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 last message will serve as git-commit. Format your final message as follows:
- Start with a one-liner commit message in imperative mode (e.g., 'Fix bug in user authentication')
- The one-liner should reference the fixed issue (e.g., 'Fix bug in user authentication (#12345)')
- Follow with a blank line, then a body with a nice summary of the changes
- In the body, reference the fixed issue using 'Closes #12345' format

Example format:
Fix critical bug in session handling (#75)

This commit resolves the memory leak caused by not properly
closing session handles. The fix ensures all resources are
released when a session is terminated.

Closes #75
```

### User Query

goal: allow to see conversations without breaking the flow

# context

we have a TUI that can open an external viewer via an env-var named `AGENT_MD_VIEWER`, however today this viewer blocks the UI

# task

- execute the external viewer process in an Async
- modify the TUI state to add a list of ongoing Async auxilliary tasks, the one Auxilliary task constructor for now is gonna be `Viewer (Async ()) ConversationId SessionId`



### Available Tools

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

---

## Step 2: LLM Turn

### Thinking Process

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

The user wants to modify a TUI (Terminal User Interface) application that uses an external viewer via an environment variable `AGENT_MD_VIEWER`. Currently, the viewer blocks the UI, and they want to:

1. Execute the external viewer process asynchronously (using `Async`)
2. Add a list of ongoing async auxiliary tasks to the TUI state
3. Create a constructor `Viewer (Async ()) ConversationId SessionId` for these tasks

Let me start by exploring the project structure to understand the codebase.
</details>

### Response



### Tool Calls

- **bash_list-files**

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## Step 3: User Turn



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## Step 4: LLM Turn

### Thinking Process

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

Let me explore the TUI-related files to understand the current structure. I'll start with the TUI types and core files.
</details>

### Response



### Tool Calls

- **bash_read-file**
- **bash_read-file**

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## Step 5: User Turn



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## Step 6: LLM Turn

### Thinking Process

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

Now let me look at the Event.hs file to see how the viewer is currently called:
</details>

### Response



### Tool Calls

- **bash_read-file**

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## Step 7: User Turn



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## Step 8: LLM Turn

### Thinking Process

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

Now I have a clear picture of the codebase. Let me look at some additional files to understand the structure better, particularly for imports:
</details>

### Response

Now let me check what imports are available and understand the SessionId type:

### Tool Calls

- **bash_grep-files**
- **bash_read-file**

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## Step 9: User Turn



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## Step 10: LLM Turn

### Thinking Process

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

Now I have a good understanding of the codebase. Let me also check the cabal file to see the dependencies:
</details>

### Response



### Tool Calls

- **bash_read-file**

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## Step 11: User Turn



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## Step 12: LLM Turn

### Thinking Process

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

Now I have a clear understanding of the codebase. Let me now implement the changes:

1. Modify `System.Agents.TUI.Types` to:
   - Add `AuxiliaryTask` type with `Viewer (Async ()) ConversationId SessionId` constructor
   - Add `_auxiliaryTasks :: [AuxiliaryTask]` field to `UIState`
   - Update `initUIState` to initialize the empty list

2. Modify `System.Agents.TUI.Event` to:
   - Execute the external viewer process asynchronously
   - Add the `Async` to the list of auxiliary tasks

Let me start implementing these changes:
</details>

### Response

Now I have a clear understanding of the codebase. Let me implement the changes:

1. First, I'll modify `Types.hs` to add the `AuxiliaryTask` type and update `UIState`
2. Then modify `Event.hs` to run the viewer asynchronously and track the tasks

### Tool Calls

- **bash_write-file**

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## Step 13: User Turn



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## Step 14: LLM Turn

### Thinking Process

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

Now I need to update the Event.hs file to:
1. Import the necessary Async functions
2. Modify `handleViewSessionWithExternalViewer` to run the viewer asynchronously and track the task
3. Export/import the new `auxiliaryTasks` lens from Core.hs
</details>

### Response

Now let me update the Event.hs file to execute the viewer asynchronously:

### Tool Calls

- **bash_write-file**

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## Step 15: User Turn



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## Step 16: LLM Turn

### Thinking Process

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

Now I need to update the Core.hs module to export the new `auxiliaryTasks` lens:
</details>

### Response

Now I need to update the Core.hs module to export the new `auxiliaryTasks` lens:

### Tool Calls

- **bash_write-file**

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## Step 17: User Turn



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## Step 18: LLM Turn

### Thinking Process

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

Now let me compile the code to check for any errors:
</details>

### Response

Now let me compile the code to check for any errors:

### Tool Calls

- **bash_check-code**

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## Step 19: User Turn



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## Step 20: LLM Turn

### Thinking Process

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

I need to fix the Show instance for AuxiliaryTask. Since `Async ()` doesn't have a Show instance, I'll need to write a custom one that doesn't try to show the Async handle directly.
</details>

### Response

I need to fix the Show instance for `AuxiliaryTask` since `Async ()` doesn't have a Show instance:

### Tool Calls

- **bash_write-file**

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## Step 21: User Turn



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## Step 22: LLM Turn

### Thinking Process

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

Now let me compile again to check for any remaining errors:
</details>

### Response



### Tool Calls

- **bash_check-code**

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## Step 23: User Turn



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## Step 24: LLM Turn

### Thinking Process

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

I need to import `poll` from `Control.Concurrent.Async`. Let me fix the imports:
</details>

### Response

I need to import `poll` from the `async` module:

### Tool Calls

- **bash_write-file**

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## Step 25: User Turn



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## Step 26: LLM Turn

### Thinking Process

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

Now let me compile again to check for any remaining errors:
</details>

### Response



### Tool Calls

- **bash_check-code**

---

## Step 27: User Turn



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## Step 28: LLM Turn

### Thinking Process

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

The code compiles successfully now. There's only a warning about unused imports (Async and cancel), but I'll leave those since they might be useful for future extensions. Let me also run the tests to make sure everything is working correctly.
</details>

### Response

The code compiles successfully. Let me also run the tests to make sure everything is working:

### Tool Calls

- **bash_check-code**

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## Step 29: User Turn



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## Step 30: LLM Turn

### Thinking Process

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

All 130 tests pass. The implementation is complete and working correctly. Let me summarize the changes I made:

1. **System.Agents.TUI.Types**:
   - Added import for `Control.Concurrent.Async (Async)`
   - Added new `AuxiliaryTask` type with a `Viewer` constructor: `Viewer (Async ()) ConversationId SessionId`
   - Added custom `Show` instance for `AuxiliaryTask` since `Async` doesn't have a `Show` instance
   - Added `_auxiliaryTasks :: [AuxiliaryTask]` field to `UIState`
   - Initialized `_auxiliaryTasks = []` in `initUIState`

2. **System.Agents.TUI.Event**:
   - Added import for `async`, `poll`, and `filterM`
   - Modified `handleViewSessionWithExternalViewer` to:
     - Use `async` instead of `forkIO` to run the viewer process
     - Create a `Viewer` task with the `Async` handle, conversation ID, and session ID
     - Add the task to the `_auxiliaryTasks` list
   - Added `cleanupAuxiliaryTasks` function that runs on every heartbeat to remove completed tasks
   - Updated `handleHeartbeat` to call `cleanupAuxiliaryTasks`

3. **System.Agents.TUI.Core**:
   - Exported `AuxiliaryTask(..)` and `auxiliaryTasks` lens

The external viewer now runs asynchronously without blocking the TUI, and the tasks are tracked in the state for proper cleanup.
</details>

### Response

All tests pass. Let me provide a summary of the changes:

## Summary

I've implemented the changes to allow viewing conversations without blocking the TUI flow:

### 1. **System.Agents.TUI.Types**
- Added import for `Control.Concurrent.Async (Async)`
- Added new `AuxiliaryTask` type with constructor:
  ```haskell
  data AuxiliaryTask = Viewer (Async ()) ConversationId SessionId
  ```
- Added custom `Show` instance for `AuxiliaryTask` (since `Async` doesn't have a `Show` instance)
- Added `_auxiliaryTasks :: [AuxiliaryTask]` field to `UIState`
- Initialized `_auxiliaryTasks = []` in `initUIState`

### 2. **System.Agents.TUI.Event**
- Added imports for `async`, `poll`, and `filterM`
- Modified `handleViewSessionWithExternalViewer` to:
  - Use `async` instead of `forkIO` to run the viewer process asynchronously
  - Create a `Viewer` task with the `Async` handle, conversation ID, and session ID
  - Add the task to the `_auxiliaryTasks` list
- Added `cleanupAuxiliaryTasks` function that runs on every heartbeat to remove completed tasks
- Updated `handleHeartbeat` to call `cleanupAuxiliaryTasks`

### 3. **System.Agents.TUI.Core**
- Exported `AuxiliaryTask(..)` and `auxiliaryTasks` lens

The external viewer now runs asynchronously without blocking the TUI, and the tasks are tracked in the state for proper cleanup.

---

Execute external viewer asynchronously to prevent TUI blocking (#issue)

This commit modifies the TUI to run the external markdown viewer (configured via AGENT_MD_VIEWER environment variable) asynchronously using the `async` library. Previously, the viewer was launched with `forkIO` but still used blocking process calls that could freeze the UI.

Changes:
- Added `AuxiliaryTask` type with `Viewer (Async ()) ConversationId SessionId` constructor
- Added `_auxiliaryTasks` field to `UIState` to track ongoing async tasks
- Modified `handleViewSessionWithExternalViewer` to use `async` and track the task
- Added `cleanupAuxiliaryTasks` to remove completed tasks during heartbeat

Closes #issue
