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

**🔑 Session ID:** 0e41c92c-d67e-4802-82b1-48b88f34ae46

---

## 📊 Statistics

### Turn Counts

| Metric | Value |
|--------|-------|
| Total Turns | 32 |
| 👤 User Turns | 16 |
| 🤖 LLM Turns | 16 |

### 🔧 Tool Calls

**Total Tool Calls:** 19

`bash_read-file      `    9 ████████████████████████████████████████████████████████████
`bash_check-code     `    4 ██████████████████████████
`bash_grep-files     `    3 ████████████████████
`bash_write-file     `    2 █████████████
`bash_list-files     `    1 ██████

### 💾 Byte Usage

`Input     `    227 KiB ████████████████████████████████████████████████████████████
`Output    `      2 KiB 
`Reasoning `      8 KiB ██
**Total:** 237 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

# Pretty-print tool args arguments/results

> unsure this is the right path to unpack arguments, we'll fix it later though 

 _Originally posted by @lucasdicioccio in [#192](https://github.com/lucasdicioccio/agents-exe/pull/192/changes#r2914399587)_

#191 seems incomplete regarding the JSON lookup and pretty-print, size is ok though

---
From #193



### 🛠️ 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_write-file** (`bash_write-file`)
  - Description: Write content to 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

---

## 🤖 Step 2: LLM Turn

### 💭 Thinking Process

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

The user wants me to implement pretty-printing for tool arguments and results. This seems to be related to a GitHub project about agents. Let me first explore the project structure to understand what we're working with.
</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 start by exploring the relevant files related to pretty-printing and tools. Based on the issue description, I need to look at:
1. `SessionPrint.hs` - likely related to session printing
2. Tool-related files that might handle arguments/results
3. Any JSON lookup related code

Let me start by reading the SessionPrint.hs file and some tool-related files.
</details>

### 💬 Response



### 🔧 Tool Calls

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

---

## 👤 Step 5: User Turn



---

## 🤖 Step 6: LLM Turn

### 💭 Thinking Process

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

Let me look at the issue more closely. The PR comment mentions "unsure this is the right path to unpack arguments" and refers to JSON lookup and pretty-print. Let me look at the test files and also search for any JSON lookup related to tool arguments.
</details>

### 💬 Response

Let me search for how tool arguments are being extracted and formatted, and look at the test file:

### 🔧 Tool Calls

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

---

## 👤 Step 7: User Turn



---

## 🤖 Step 8: LLM Turn

### 💭 Thinking Process

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

Looking at the code, I can see the issue now. In `SessionPrint.hs`, there are two functions `formatToolArguments` and `formatToolArgumentsDirect` that look for arguments in the tool call object. But the issue says "unsure this is the right path to unpack arguments".

Let me look at the session types to understand the structure of the data better:
</details>

### 💬 Response



### 🔧 Tool Calls

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

---

## 👤 Step 9: User Turn



---

## 🤖 Step 10: LLM Turn

### 💭 Thinking Process

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

Now let me look at how tool calls are structured. Based on the issue comment about "unpack arguments" and looking at `SessionPrint.hs`, it seems the JSON structure being parsed might not be correct. Let me look at OpenAI.hs to see how tool calls are parsed/created:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 11: User Turn



---

## 🤖 Step 12: LLM Turn

### 💭 Thinking Process

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

Now I can see the structure. The `ToolCallFunction` has:
- `toolCallFunctionName :: ToolName`
- `toolCallFunctionArgsUnparsed :: Text`
- `toolCallFunctionArgs :: Maybe Aeson.Value`

Looking at `SessionPrint.hs`, the current code looks for:
1. `"function"` key which should contain an object with `"name"` and `"arguments"` keys
2. Or directly `"name"` key in the top level object

But the actual structure when stored in `LlmToolCall` (which wraps `Aeson.Value`) seems to be serialized with the `ToolCall` structure which includes:
- `id`
- `type`
- `function` - which contains `name` and `arguments` (as a string!)

So the issue is that in `formatToolArguments`, the `arguments` field is a JSON string, not a JSON object/value. The code needs to parse the string first before trying to pretty-print it.

Let me check what the actual JSON structure looks like by looking at the test file or any example:
</details>

### 💬 Response

Let me look at the test file to understand the JSON structure:

### 🔧 Tool Calls

- **bash_grep-files**

---

## 👤 Step 13: User Turn



---

## 🤖 Step 14: LLM Turn

### 💭 Thinking Process

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

Let me search for ToolCall in the test files more broadly:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_grep-files**

---

## 👤 Step 15: User Turn



---

## 🤖 Step 16: LLM Turn

### 💭 Thinking Process

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

Now I understand the structure better. Looking at the test file `SessionEditTests.hs`, I can see how tool calls are structured:

```haskell
[ Session.LlmToolCall $ Aeson.object
    [ "id" .= ("call1" :: Text)
    , "type" .= ("function" :: Text)
    , "function" .= Aeson.object
        [ "name" .= ("tool1" :: Text)
        , "arguments" .= ("{\"key\": \"value\"}" :: Text)  -- Note: arguments is a STRING!
        ]
    ]
]
```

So the `arguments` field is a JSON string (unparsed), not a JSON object. This is consistent with what I saw in `OpenAI.hs`:

```haskell
data ToolCallFunction
    = ToolCallFunction
    { toolCallFunctionName :: ToolName
    , toolCallFunctionArgsUnparsed :: Text
    , toolCallFunctionArgs :: Maybe Aeson.Value
    }
```

And the `FromJSON` instance:
```haskell
instance FromJSON ToolCallFunction where
    parseJSON =
        Aeson.withObject "ToolCallFunction" $ \v -> do
            argsStr <- v .: "arguments"
            let argVal = Aeson.decode' (LByteString.fromStrict $ Text.encodeUtf8 argsStr) :: Maybe Aeson.Value
            ToolCallFunction
                <$> (ToolName <$> v .: "name")
                <*> pure argsStr
                <*> pure argVal
```

So the `arguments` field is stored as a string in the raw JSON, and needs to be parsed before it can be pretty-printed.

Now looking at the current code in `SessionPrint.hs`:

```haskell
formatToolArguments :: PrintVisibility -> KeyMap.KeyMap Aeson.Value -> Text.Text


formatToolArguments Hidden _ = ""
formatToolArguments visibility funcObj =
    case KeyMap.lookup "arguments" funcObj of
        Just argsVal -> 
            let formatted = formatJsonValuePretty argsVal
```

The issue is that `argsVal` is likely a `Aeson.String` containing JSON text, but the code is treating it as if it's already a JSON object/value. I need to handle this properly - if it's a string, I should try to parse it first before formatting. The error occurs because the raw string gets passed to `formatJsonValuePretty` instead of being parsed into actual JSON first.

```
</details>

### 💬 Response

Let me look at the Session/OpenAI.hs to understand how tool calls are stored:

### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 17: User Turn



---

## 🤖 Step 18: LLM Turn

### 💭 Thinking Process

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

Now I have a clear picture. The `LlmToolCall` stores the raw JSON object, which has the structure:
```json
{
  "id": "call_xxx",
  "type": "function",
  "function": {
    "name": "tool_name",
    "arguments": "{\"key\": \"value\"}"  // This is a STRING, not an object!
  }
}
```

The problem is in `SessionPrint.hs`. When looking up `arguments`, it gets an `Aeson.String` containing JSON text, not a JSON object. The current code tries to pretty-print it directly, which just outputs the string with escaped quotes.

The fix should:
1. Try to parse the `arguments` field as a string first (if it's a string, try to decode it as JSON)
2. If it's already a JSON value (object/array), use it directly
3. If parsing fails, display the raw value

Let me also check the tool responses to ensure consistent handling:
</details>

### 💬 Response

Now I understand the issue. The `arguments` field in a tool call is stored as a JSON string (not a JSON object), because that's how the OpenAI API returns it. The current code doesn't parse this string before pretty-printing.

Let me also look at how tool responses are formatted to ensure consistency:

### 🔧 Tool Calls

- **bash_read-file**

---

## 👤 Step 19: User Turn



---

## 🤖 Step 20: LLM Turn

### 💭 Thinking Process

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

Now I understand the full picture. The issue is in `formatToolArguments` and `formatToolArgumentsDirect` functions. The `arguments` field in the JSON is stored as a string (because OpenAI API returns it as a string that needs to be parsed), not as a JSON object.

The current code:
```haskell
formatToolArguments visibility funcObj =
    case KeyMap.lookup "arguments" funcObj of
        Just argsVal -> 
            let formatted = formatJsonValuePretty argsVal
```

When `argsVal` is an `Aeson.String` containing JSON text like `"{\"key\": \"value\"}"`, the `formatJsonValuePretty` function will output it as a quoted string with escaped quotes, not as pretty-printed JSON.

The fix should:
1. Check if `argsVal` is an `Aeson.String`
2. If so, try to parse it as JSON
3. If parsing succeeds, use the parsed value
4. If parsing fails or it's not a string, use the value as-is

Let me write the fix:
</details>

### 💬 Response

Now I understand the issue. The `arguments` field in a tool call is stored as a JSON string (because that's how the OpenAI API returns it), but the current code doesn't parse this string before pretty-printing. Let me fix the `SessionPrint.hs` file:

### 🔧 Tool Calls

- **bash_write-file**

---

## 👤 Step 21: User Turn



---

## 🤖 Step 22: 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 23: User Turn



---

## 🤖 Step 24: LLM Turn

### 💭 Thinking Process

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

The code compiled successfully with only some warnings about redundant patterns (which are due to the fact that we're already handling the `Hidden` case before calling these functions). Let me run the tests to make sure everything works:
</details>

### 💬 Response

The code compiles. Now let me run the tests to ensure everything works correctly:

### 🔧 Tool Calls

- **bash_check-code**

---

## 👤 Step 25: User Turn



---

## 🤖 Step 26: LLM Turn

### 💭 Thinking Process

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

All 254 tests passed. Let me clean up the redundant pattern match warnings by simplifying the code. The issue is that `Hidden` is already handled at the top level of both functions, so we don't need to check for it again in the case expression.
</details>

### 💬 Response

All tests pass. Let me clean up the redundant pattern match warnings by simplifying the code:

### 🔧 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 again to verify the warnings are gone:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_check-code**

---

## 👤 Step 29: User Turn



---

## 🤖 Step 30: LLM Turn

### 💭 Thinking Process

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

The warnings are gone. Now let me run the tests again to ensure everything still works:
</details>

### 💬 Response



### 🔧 Tool Calls

- **bash_check-code**

---

## 👤 Step 31: User Turn



---

## 🤖 Step 32: LLM Turn

### 💭 Thinking Process

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

All tests pass. Let me summarize what was done:

## Summary

The issue was that tool call arguments in session print were not being properly pretty-printed. The OpenAI API returns tool call arguments as a JSON string (e.g., `"{\"key\": \"value\"}"`), not as a JSON object. The original code was treating this string as a JSON value and pretty-printing it directly, which resulted in escaped quotes being displayed rather than nicely formatted JSON.

### Changes made to `src/System/Agents/SessionPrint.hs`:

1. **Added `parseArgumentsValue` function**: This function checks if the arguments value is a JSON string, and if so, attempts to parse it as JSON. If parsing succeeds, it returns the parsed value; otherwise, it keeps the original value.

2. **Updated `formatToolArguments` and `formatToolArgumentsDirect`**: These functions now use `parseArgumentsValue` to properly parse string-encoded JSON arguments before pretty-printing.

3. **Added `applyVisibility` helper function**: This centralizes the visibility logic (Hidden, Elided, ShownFull) and eliminates redundant pattern matching.

4. **Updated `formatToolResponse`**: Also uses the new `applyVisibility` function for consistency.

5. **Added import for `Data.ByteString.Lazy`**: Needed for `BSL.fromStrict` in `parseArgumentsValue`.

6. **Added documentation**: Improved comments explaining the tool call structure and why the parsing is necessary.

The fix ensures that:
- Arguments stored as JSON strings are properly parsed and pretty-printed
- If parsing fails, the original value is preserved
- Tool responses also benefit from the centralized visibility handling
- All existing tests continue to pass
</details>

### 💬 Response

All 254 tests pass. The implementation is complete.

## Summary

Fixed the pretty-printing of tool arguments and results in session print output. The issue was that the OpenAI API returns tool call arguments as a JSON string (e.g., `"{\"key\": \"value\"}"`), not as a JSON object. The original code was treating this string as a JSON value and pretty-printing it directly, resulting in escaped quotes being displayed instead of nicely formatted JSON.

### Changes made to `src/System/Agents/SessionPrint.hs`:

1. **Added `parseArgumentsValue` function**: Parses JSON string values into proper JSON objects before pretty-printing. If parsing fails, the original value is preserved.

2. **Updated `formatToolArguments` and `formatToolArgumentsDirect`**: Now properly parse string-encoded JSON arguments using `parseArgumentsValue` before formatting.

3. **Added `applyVisibility` helper function**: Centralizes visibility logic (Hidden, Elided, ShownFull) and eliminates redundant pattern matching.

4. **Updated `formatToolResponse`**: Uses the new `applyVisibility` function for consistent handling.

5. **Added documentation**: Improved comments explaining the OpenAI tool call structure:
   ```json
   {
     "id": "call_xxx",
     "type": "function", 
     "function": {
       "name": "tool_name",
       "arguments": "{\"key\": \"value\"}"  // String that needs parsing
     }
   }
   ```
