# Session Report

**Session ID:** 70f0778f-4d37-4399-9f84-c0f5fe37c3f2

---

## 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

# Implement OpenAPI Toolbox runtime and HTTP handler

## Overview
Create the Toolbox runtime that fetches OpenAPI specs and executes tool calls via HTTP.

## Scope
Create a new module `src/System/Agents/Tools/OpenAPIToolbox.hs`:

### Core Types
```haskell
data Trace
    = FetchingSpecTrace !Text  -- URL being fetched
    | SpecFetchedTrace !Int    -- HTTP status
    | ToolsConvertedTrace !Int -- Number of tools
    | CallingEndpointTrace !Text !Text !Text -- method, url, path
    | EndpointResponseTrace !Int -- status code
    | SchemaResolutionErrorTrace !Text
    deriving (Show)

data Toolbox = Toolbox
    { toolboxName :: Text
    , toolboxBaseUrl :: Text
    , toolboxTools :: TVar [OpenAPITool]
    , httpRuntime :: HttpClient.Runtime
    , headerFunc :: Maybe (IO (Map Text Text)) -- For auth headers
    }

data Config = Config
    { configUrl :: Text           -- URL to OpenAPI spec
    , configBaseUrl :: Text       -- Base URL for API calls
    , configHeaders :: Map Text Text  -- Static headers
    , configToken :: Maybe Text   -- Bearer token
    }
```

### Initialization
```haskell
initializeToolbox ::
    Tracer IO Trace ->
    Config ->
    IO (Either InitializationError Toolbox)

-- Steps:
-- 1. Create HTTP runtime with auth
-- 2. Fetch OpenAPI spec from URL
-- 3. Parse JSON to OpenAPISpec
-- 4. Dereference schemas (issue #99)
-- 5. Convert to tools (issue #100)
-- 6. Store in TVar
```

### Tool Handler (The Heart)
```haskell
-- | Creates a handler for a single OpenAPI tool
createToolHandler ::
    Toolbox ->
    OpenAPITool ->
    (Tracer IO ToolTrace -> ToolExecutionContext -> Aeson.Value -> IO (CallResult ()))

-- Implementation steps (from Python convert_tool_payload_to_tool):
handleToolCall ::
    OpenAPITool ->
    Aeson.Value -> -- tool arguments from LLM
    IO ToolResult
handleToolCall tool args = do
    -- 1. Extract path params (prefixed with p_)
    -- 2. Extract query params (prefixed with p_)
    -- 3. Extract body (param "b")
    -- 4. Format path: "/pets/{id}" with path args
    -- 5. Build full URL: baseUrl + formatted path
    -- 6. Make HTTP request
    -- 7. Return result
```

### Path Formatting
```haskell
-- Convert "/pets/{petId}" with {"p_petId": "123"} to "/pets/123"
formatPath :: Path -> Map Text Text -> Path
formatPath pathTemplate pathArgs = 
    -- Replace {name} with value from p_name
```

### HTTP Request Building
```haskell
buildRequest ::
    Method ->
    Text ->      -- Full URL
    Map Text Text ->  -- Query params
    Maybe Aeson.Value -> -- Body
    HttpClient.Request
```

### Response Handling
```haskell
data ToolResult = ToolResult
    { resultPath :: Text
    , resultMethod :: Text
    , resultStatus :: Int
    , resultPayload :: Aeson.Value
    }

-- Returns both text for LLM and structured result
handleResponse :: HttpClient.Response -> IO (ByteString, ToolResult)
```

## Integration with ToolRegistration

Following the pattern in `registerMcpToolInLLM`:
```haskell
registerOpenAPIToolInLLM ::
    Toolbox ->
    OpenAPITool ->
    Either String ToolRegistration

-- 1. Convert OpenAPITool to OpenAI.Tool (from ToolSchema)
-- 2. Create the handler function
-- 3. Return ToolRegistration
```

## Naming Convention
Following existing patterns:
```haskell
openapi2LLMName :: Text -> OpenAI.ToolName
openapi2LLMName operationId = 
    OpenAI.ToolName ("openapi_" <> toolboxName <> "_" <> operationId)
```

## Acceptance Criteria
- [ ] Can initialize toolbox from OpenAPI URL
- [ ] Can call tools with proper path parameter substitution
- [ ] Can call tools with query parameters
- [ ] Can call tools with JSON body
- [ ] Returns proper CallResult types
- [ ] Integrates with ToolRegistration system
- [ ] Auth headers (Bearer token) work correctly
- [ ] Tracing for all operations

## Error Handling
- Network errors -> IOToolError
- JSON parse errors -> IOToolError  
- HTTP 4xx/5xx -> Return response anyway (let LLM decide)
- Missing required params -> IOToolError

## Related Files
- `src/System/Agents/Tools/OpenAPI/Types.hs`
- `src/System/Agents/Tools/OpenAPI/Resolver.hs`
- `src/System/Agents/Tools/OpenAPI/Converter.hs`
- `src/System/Agents/Tools/McpToolbox.hs` - similar pattern
- `src/System/Agents/ToolRegistration.hs` - integration point
- `src/System/Agents/HttpClient.hs` - HTTP client

## Tradeoffs
- **Auth**: Simple Bearer token auth implemented first. More complex auth (OAuth, API keys in query) can be added later.
- **Response Handling**: Return full response body as text to LLM. Could add truncation for large responses.
- **Reloading**: Static toolbox (no reload) for MVP. Dynamic reloading similar to BashToolbox can be added later.




---
Please mention issue #98 in the commit message.



### 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>

Let me start by exploring the project structure to understand the existing codebase and patterns.
</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 explore the key files to understand the existing patterns:
1. OpenAPI Types - to understand the data structures
2. OpenAPI Resolver - to understand schema dereferencing
3. OpenAPI Converter - to understand tool conversion
4. McpToolbox - to understand the similar pattern
5. ToolRegistration - to understand integration point
6. HttpClient - to understand HTTP client patterns
</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>

Now let me read the McpToolbox and ToolRegistration files to understand the integration patterns.
</details>

### Response



### Tool Calls

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

---

## Step 7: User Turn



---

## Step 8: LLM Turn

### Thinking Process

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

Now let me read the Tools module to understand the Tool type and ToolExecutionContext:
</details>

### Response



### Tool Calls

- **bash_read-file**
- **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 also check the Tools.Base and Tools.Trace modules to understand the CallResult type:
</details>

### Response



### Tool Calls

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

---

## Step 11: User Turn



---

## Step 12: LLM Turn

### Thinking Process

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

Now let me check the OpenAI module to understand the ToolName and Tool types:
</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 I have a good understanding of the codebase. Let me also check the cabal file to understand the dependencies:
</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 have a complete understanding of the codebase. Let me create the OpenAPIToolbox module. Based on the requirements and patterns I've seen:

1. I'll create a module that:
   - Defines Trace, Toolbox, and Config types
   - Implements initialization that fetches and parses OpenAPI specs
   - Implements tool handlers that execute HTTP calls
   - Integrates with the ToolRegistration system

Let me write the module:
</details>

### Response

Now I have a complete understanding of the codebase. Let me create the OpenAPIToolbox module.

### Tool Calls

- **bash_write-file**

---

## Step 17: User Turn



---

## Step 18: LLM Turn

### Thinking Process

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

Now I need to fix some issues with the code. Let me compile it first to see what errors there are:
</details>

### Response



### Tool Calls

- **bash_check-code**

---

## Step 19: User Turn



---

## Step 20: LLM Turn

### Thinking Process

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

I see that the compilation succeeded, but my module wasn't compiled! Let me check if I need to add it to the cabal file. Let me look at the cabal file again and add the new module.
</details>

### Response

The compilation succeeded but my new module wasn't compiled. I need to add it to the cabal file:

### Tool Calls

- **bash_read-file**

---

## Step 21: User Turn



---

## Step 22: LLM Turn

### Thinking Process

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

I need to add the new module `System.Agents.Tools.OpenAPIToolbox` to the cabal file. Let me update it:
</details>

### Response



### Tool Calls

- **bash_write-file**

---

## Step 23: User Turn



---

## Step 24: LLM Turn

### Thinking Process

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

Now let me compile again to see if there are any issues with the new module:
</details>

### Response



### Tool Calls

- **bash_check-code**

---

## Step 25: User Turn



---

## Step 26: LLM Turn

### Thinking Process

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

I need to fix several issues:

1. `HttpClient.HttpException` - I need to enable `ScopedTypeVariables` or use a different approach
2. `responseStatusCode` should be `responseStatus` with proper extraction
3. Need to import `Operation` from the Types module
4. Need to fix the opOperationId import

Let me fix these issues:
</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 try compiling again:
</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 have several issues to fix:

1. Need to import the `Tracer` data constructor (not just the type)
2. Need to use `Aeson.Object` type synonym correctly
3. Need to use `HttpTypes.Header` type for headers

Let me fix these:
</details>

### Response



### Tool Calls

- **bash_write-file**

---

## Step 31: User Turn



---

## Step 32: LLM Turn

### Thinking Process

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

Let me compile again to see if there are any more issues:
</details>

### Response



### Tool Calls

- **bash_check-code**

---

## Step 33: User Turn



---

## Step 34: LLM Turn

### Thinking Process

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

The compilation succeeded! There are some warnings but those are fine for now. Let me also run the tests to make sure everything is working:
</details>

### Response

The code compiles successfully. Let me run the tests to verify:

### Tool Calls

- **bash_check-code**

---

## Step 35: User Turn



---

## Step 36: LLM Turn

### Thinking Process

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

All 92 tests passed. Now let me clean up the code by removing the unused imports and fixing the warnings. Then I'll provide the final summary.
</details>

### Response

All tests pass. Let me clean up the warnings in the module:

### Tool Calls

- **bash_write-file**

---

## Step 37: User Turn



---

## Step 38: LLM Turn

### Thinking Process

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

Now let me compile one more time to make sure everything is clean:
</details>

### Response



### Tool Calls

- **bash_check-code**

---

## Step 39: User Turn



---

## Step 40: LLM Turn

### Thinking Process

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

The code compiles cleanly now. Let me run the tests one more time to make sure everything still works:
</details>

### Response



### Tool Calls

- **bash_check-code**

---

## Step 41: User Turn



---

## Step 42: LLM Turn

### Thinking Process

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

All tests pass. Now let me read the final version of the file to make sure everything is correct:
</details>

### Response

All tests pass. Let me review the final implementation:

### Tool Calls

- **bash_read-file**

---

## Step 43: User Turn



---

## Step 44: LLM Turn

### Thinking Process

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

The implementation looks complete and follows all the requirements. Let me provide the commit message.
</details>

### Response

The implementation is complete. Here's a summary of what was implemented:

Implement OpenAPI Toolbox runtime and HTTP handler (#98)

This commit creates a new module `src/System/Agents/Tools/OpenAPIToolbox.hs` that provides:

**Core Types:**
- `Trace` - Events for monitoring spec fetching, tool conversion, and endpoint execution
- `Toolbox` - Runtime state containing tools, HTTP runtime, and configuration
- `Config` - Configuration for initialization (URL, base URL, headers, token)
- `InitializationError` - Error type for initialization failures
- `ToolResult` - Structured result from tool execution

**Initialization:**
- `initializeToolbox` - Fetches OpenAPI spec from URL, parses JSON, dereferences schemas,
  converts to tools, and creates toolbox runtime with Bearer token auth support

**Tool Execution:**
- `createToolHandler` - Creates handler integrating with ToolExecutionContext
- `handleToolCall` - Executes HTTP calls with proper parameter extraction and substitution
- `formatPath` - Replaces path parameters in URL templates (e.g., `/pets/{id}` → `/pets/123`)
- `buildRequest` / `buildFullUrl` / `buildQueryString` - HTTP request construction

**Integration:**
- `registerOpenAPIToolInLLM` - Creates ToolRegistration for LLM integration
- `openapi2LLMName` - Naming convention: `openapi_<toolbox>_<operationId>`

**Features:**
- Path parameter substitution (p_ prefix)
- Query parameter handling
- JSON body support
- Bearer token authentication
- Static and dynamic headers
- Comprehensive tracing
- Proper error handling

Closes #98
