From 60eb0d8a82312761358bf67db9c2678e388bc077 Mon Sep 17 00:00:00 2001
From: ShlomoStept <shlomostept.ss@gmail.com>
Date: Thu, 8 Jan 2026 23:50:30 -0500
Subject: [PATCH 1/3] [WIP] Fix tool result markdown rendering for JSON arrays
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

## Investigation Plan

### Problem Statement
Tool results that are JSON arrays of objects (e.g., `[{"type": "text", "text": "## Heading\n\nParagraph"}]`)
are NOT rendering the markdown content properly. The text values within the JSON objects should be
parsed and displayed as formatted markdown (headers, paragraphs, lists, etc.).

### Current Behavior
- JSON arrays are detected
- But the text content within is shown as raw text, not rendered markdown

### Expected Behavior
- Each "text" value in content blocks should be rendered as proper markdown
- Headers should display as `<h2>`, `<h3>`, etc.
- Lists should display as `<ul>/<li>`
- Code blocks should have syntax highlighting

### Tasks
1. Review PR comments for relevant feedback
2. Analyze current `render_content_block_array()` implementation
3. Fix markdown parsing within JSON text values
4. Fix subagent functionality issues
5. Add/update tests
6. Verify on ShlomoStept/claude-code-transcripts fork ONLY

IMPORTANT: All work on ShlomoStept fork only. NO pushes to simonw/upstream.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

From 778d2800c89e1a0e2eccaf3e14610a346d0aa0ee Mon Sep 17 00:00:00 2001
From: ShlomoStept <shlomostept.ss@gmail.com>
Date: Fri, 9 Jan 2026 01:58:44 -0500
Subject: [PATCH 2/3] Fix markdown rendering in tool results with Python list
 content
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

When tool_result content is a Python list of content blocks (not a JSON
string), the content was incorrectly rendered as raw JSON instead of
markdown. This fix adds is_content_block_list() helper function and
updates the tool_result handling to properly render markdown when content
is a list containing content blocks with a "type" field.

- Add is_content_block_list() function to detect Python list content blocks
- Fix render_content_block() to call render_content_block_array() for list content
- Add 10 new tests (8 for is_content_block_list, 2 for tool_result list rendering)
- All 119 tests pass

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 implementation_plan.md                        | 207 ++++++++++++++++++
 src/claude_code_transcripts/__init__.py       |  32 ++-
 task.md                                       |  20 ++
 ...t_content_block_list_renders_markdown.html |  13 ++
 ...ntent_block_list_with_multiple_blocks.html |  18 ++
 tests/test_generate_html.py                   |  70 ++++++
 walkthrough.md                                | 127 +++++++++++
 7 files changed, 485 insertions(+), 2 deletions(-)
 create mode 100644 implementation_plan.md
 create mode 100644 task.md
 create mode 100644 tests/__snapshots__/test_generate_html/TestRenderContentBlock.test_tool_result_content_block_list_renders_markdown.html
 create mode 100644 tests/__snapshots__/test_generate_html/TestRenderContentBlock.test_tool_result_content_block_list_with_multiple_blocks.html
 create mode 100644 walkthrough.md

diff --git a/implementation_plan.md b/implementation_plan.md
new file mode 100644
index 0000000..3dd5f3f
--- /dev/null
+++ b/implementation_plan.md
@@ -0,0 +1,207 @@
+# Implementation Plan: Fix Tool Result Markdown Rendering
+
+## Goal
+
+Fix the markdown rendering issue in tool results when content is a Python list of content blocks (not just a JSON string).
+
+## Background
+
+The current implementation correctly handles tool result content when it's a JSON string like:
+```json
+'[{"type": "text", "text": "## Report\n\n- Item 1"}]'
+```
+
+However, it fails to render markdown when the content is already a Python list:
+```python
+[{"type": "text", "text": "## Report\n\n- Item 1"}]
+```
+
+This causes markdown headers, lists, and code blocks to appear as raw text instead of rendered HTML.
+
+## Root Cause Analysis
+
+In `src/claude_code_transcripts/__init__.py`, the `render_content_block()` function has this logic for `tool_result` blocks (lines 1020-1084):
+
+1. **Lines 1033-1044**: When `content` is a string, it checks if it's a content block array using `is_content_block_array()`, parses it, and calls `render_content_block_array()` to render markdown.
+
+2. **Lines 1080-1081**: When `content` is a list, it immediately calls `format_json(content)` WITHOUT checking if it's a content block array that should be rendered as markdown.
+
+```python
+# BUG: Line 1080 - doesn't check for content block array
+elif isinstance(content, list) or is_json_like(content):
+    content_markdown_html = format_json(content)  # Should render as markdown!
+```
+
+## Proposed Changes
+
+### File: [src/claude_code_transcripts/__init__.py](file:///Users/sys/Documents/_TEMP_project_to_redesign_new_computer_file_system/testing_projects/testing_claude_code_transcripts/claude-code-transcripts/src/claude_code_transcripts/__init__.py)
+
+#### Change 1: Add `is_content_block_list()` helper function [NEW]
+
+Add a new helper function after `is_content_block_array()` (around line 138) to detect when a Python list is a content block array:
+
+```python
+def is_content_block_list(content):
+    """Check if content is a Python list of content blocks.
+
+    Args:
+        content: Content to check.
+
+    Returns:
+        True if content is a list containing dict items with 'type' keys.
+    """
+    if not isinstance(content, list):
+        return False
+    if not content:
+        return False
+    # Check if items look like content blocks
+    for item in content:
+        if isinstance(item, dict) and "type" in item:
+            return True
+    return False
+```
+
+#### Change 2: Fix tool_result handling for Python list content [MODIFY]
+
+Modify lines 1080-1083 to check for content block lists and render them properly:
+
+**Before:**
+```python
+elif isinstance(content, list) or is_json_like(content):
+    content_markdown_html = format_json(content)
+else:
+    content_markdown_html = format_json(content)
+```
+
+**After:**
+```python
+elif isinstance(content, list):
+    # Check if it's a content block array that should be rendered as markdown
+    if is_content_block_list(content):
+        rendered = render_content_block_array(content)
+        if rendered:
+            content_markdown_html = rendered
+        else:
+            content_markdown_html = format_json(content)
+    else:
+        content_markdown_html = format_json(content)
+else:
+    content_markdown_html = format_json(content)
+```
+
+### File: [tests/test_generate_html.py](file:///Users/sys/Documents/_TEMP_project_to_redesign_new_computer_file_system/testing_projects/testing_claude_code_transcripts/claude-code-transcripts/tests/test_generate_html.py)
+
+#### Change 3: Add test for Python list content [NEW]
+
+Add a new test after `test_tool_result_content_block_array_with_tool_use`:
+
+```python
+def test_tool_result_content_block_list_renders_markdown(self, snapshot_html):
+    """Test that tool_result with content as Python list renders markdown properly."""
+    block = {
+        "type": "tool_result",
+        "content": [
+            {"type": "text", "text": "## Report\n\n- Item 1\n- Item 2\n\n```python\ncode\n```"}
+        ],
+        "is_error": False,
+    }
+    result = render_content_block(block)
+    # Should render as HTML, not raw JSON
+    assert "<h2>Report</h2>" in result or "<h2>" in result
+    assert "<li>Item 1</li>" in result or "<li>" in result
+    # Should not show raw JSON structure
+    assert '"type": "text"' not in result
+    assert result == snapshot_html
+
+def test_tool_result_content_block_list_with_multiple_blocks(self, snapshot_html):
+    """Test that tool_result with multiple text blocks renders all as markdown."""
+    block = {
+        "type": "tool_result",
+        "content": [
+            {"type": "text", "text": "## First Section\n\n- Point A"},
+            {"type": "text", "text": "## Second Section\n\n- Point B"}
+        ],
+        "is_error": False,
+    }
+    result = render_content_block(block)
+    # Both sections should be rendered
+    assert "First Section" in result
+    assert "Second Section" in result
+    assert "Point A" in result
+    assert "Point B" in result
+    # Should not show raw JSON
+    assert '"type": "text"' not in result
+    assert result == snapshot_html
+```
+
+#### Change 4: Add test for `is_content_block_list` function [NEW]
+
+Add tests for the new helper function:
+
+```python
+class TestIsContentBlockList:
+    """Tests for is_content_block_list helper function."""
+
+    def test_empty_list(self):
+        assert is_content_block_list([]) == False
+
+    def test_list_with_text_block(self):
+        assert is_content_block_list([{"type": "text", "text": "hello"}]) == True
+
+    def test_list_with_image_block(self):
+        assert is_content_block_list([{"type": "image", "source": {}}]) == True
+
+    def test_list_with_mixed_blocks(self):
+        content = [
+            {"type": "text", "text": "hello"},
+            {"type": "image", "source": {}}
+        ]
+        assert is_content_block_list(content) == True
+
+    def test_list_without_type(self):
+        assert is_content_block_list([{"key": "value"}]) == False
+
+    def test_not_a_list(self):
+        assert is_content_block_list("string") == False
+        assert is_content_block_list({"type": "text"}) == False
+        assert is_content_block_list(None) == False
+```
+
+## Verification Plan
+
+### Automated Tests
+
+1. Run existing tests to ensure no regressions:
+   ```bash
+   uv run pytest tests/test_generate_html.py -v
+   ```
+
+2. Run new tests for the fix:
+   ```bash
+   uv run pytest tests/test_generate_html.py::TestRenderContentBlock::test_tool_result_content_block_list_renders_markdown -v
+   uv run pytest tests/test_generate_html.py::TestIsContentBlockList -v
+   ```
+
+3. Update snapshots if needed:
+   ```bash
+   uv run pytest --snapshot-update
+   ```
+
+### Manual Verification
+
+1. Create a test session JSON with tool result content as Python list
+2. Generate HTML using `uv run claude-code-transcripts`
+3. Verify markdown is rendered (headings, lists, code blocks display correctly)
+
+## Items Requiring Review
+
+> [!IMPORTANT]
+> The fix adds a new helper function `is_content_block_list()` which is similar to `is_content_block_array()` but for Python lists instead of JSON strings. Consider if these could be unified.
+
+## Summary of Files to Change
+
+| File | Action | Description |
+|------|--------|-------------|
+| `src/claude_code_transcripts/__init__.py` | MODIFY | Add `is_content_block_list()` function and fix tool_result handling |
+| `tests/test_generate_html.py` | MODIFY | Add tests for new functionality |
+| `tests/__snapshots__/*.ambr` | UPDATE | Snapshot updates from new tests |
diff --git a/src/claude_code_transcripts/__init__.py b/src/claude_code_transcripts/__init__.py
index def9d6a..2358bfb 100644
--- a/src/claude_code_transcripts/__init__.py
+++ b/src/claude_code_transcripts/__init__.py
@@ -137,6 +137,26 @@ def is_content_block_array(text):
         return False
 
 
+def is_content_block_list(content):
+    """Check if content is a Python list of content blocks.
+
+    Args:
+        content: Content to check.
+
+    Returns:
+        True if content is a list containing dict items with 'type' keys.
+    """
+    if not isinstance(content, list):
+        return False
+    if not content:
+        return False
+    # Check if items look like content blocks
+    for item in content:
+        if isinstance(item, dict) and "type" in item:
+            return True
+    return False
+
+
 def render_content_block_array(blocks):
     """Render an array of content blocks.
 
@@ -1077,8 +1097,16 @@ def render_content_block(block):
                         content_markdown_html = format_json(content)
                     else:
                         content_markdown_html = render_markdown_text(content)
-        elif isinstance(content, list) or is_json_like(content):
-            content_markdown_html = format_json(content)
+        elif isinstance(content, list):
+            # Check if it's a content block array that should be rendered as markdown
+            if is_content_block_list(content):
+                rendered = render_content_block_array(content)
+                if rendered:
+                    content_markdown_html = rendered
+                else:
+                    content_markdown_html = format_json(content)
+            else:
+                content_markdown_html = format_json(content)
         else:
             content_markdown_html = format_json(content)
         return _macros.tool_result(content_markdown_html, content_json_html, is_error)
diff --git a/task.md b/task.md
new file mode 100644
index 0000000..c47638c
--- /dev/null
+++ b/task.md
@@ -0,0 +1,20 @@
+# Task Tracker: Fix Tool Result Markdown Rendering
+
+## Status: Complete
+
+### Completed Tasks
+
+- [x] Review PR comments for markdown rendering issues
+- [x] Analyze current implementation - find render_content_block_array function
+- [x] Identify root cause of markdown not rendering in content block arrays
+- [x] Fix markdown rendering in content block arrays
+- [x] Verify subagent display (Task/Agent tools) works correctly
+- [x] Add tests for is_content_block_list function
+- [x] Add tests for tool_result with Python list content
+- [x] Run all tests (119 passed)
+- [x] Format code with black
+- [x] Commit changes to ShlomoStept fork
+
+## Summary
+
+Fixed the bug where tool result content as a Python list (not JSON string) was not rendering markdown properly. The fix adds a helper function `is_content_block_list()` and modifies the `tool_result` handling to render markdown when content is a list of content blocks.
diff --git a/tests/__snapshots__/test_generate_html/TestRenderContentBlock.test_tool_result_content_block_list_renders_markdown.html b/tests/__snapshots__/test_generate_html/TestRenderContentBlock.test_tool_result_content_block_list_renders_markdown.html
new file mode 100644
index 0000000..d173e4e
--- /dev/null
+++ b/tests/__snapshots__/test_generate_html/TestRenderContentBlock.test_tool_result_content_block_list_renders_markdown.html
@@ -0,0 +1,13 @@
+<div class="tool-result"><div class="tool-result-header"><span class="tool-result-label"><span class="result-icon">←</span> Result</span><div class="view-toggle" role="tablist"><button class="view-toggle-tab active" role="tab" aria-selected="true" data-view="markdown">Markdown</button><button class="view-toggle-tab" role="tab" aria-selected="false" data-view="json">JSON</button></div></div><div class="truncatable"><div class="truncatable-content"><div class="view-markdown">
+<div class="assistant-text"><h2>Report</h2>
+<ul>
+<li>Item 1</li>
+<li>Item 2</li>
+</ul>
+<pre><code class="language-python">code
+</code></pre></div></div><div class="view-json"><pre class="json">[
+  {
+    &quot;type&quot;: &quot;text&quot;,
+    &quot;text&quot;: &quot;## Report\n\n- Item 1\n- Item 2\n\n```python\ncode\n```&quot;
+  }
+]</pre></div></div><button class="expand-btn">Show more</button></div></div>
\ No newline at end of file
diff --git a/tests/__snapshots__/test_generate_html/TestRenderContentBlock.test_tool_result_content_block_list_with_multiple_blocks.html b/tests/__snapshots__/test_generate_html/TestRenderContentBlock.test_tool_result_content_block_list_with_multiple_blocks.html
new file mode 100644
index 0000000..4689dbb
--- /dev/null
+++ b/tests/__snapshots__/test_generate_html/TestRenderContentBlock.test_tool_result_content_block_list_with_multiple_blocks.html
@@ -0,0 +1,18 @@
+<div class="tool-result"><div class="tool-result-header"><span class="tool-result-label"><span class="result-icon">←</span> Result</span><div class="view-toggle" role="tablist"><button class="view-toggle-tab active" role="tab" aria-selected="true" data-view="markdown">Markdown</button><button class="view-toggle-tab" role="tab" aria-selected="false" data-view="json">JSON</button></div></div><div class="truncatable"><div class="truncatable-content"><div class="view-markdown">
+<div class="assistant-text"><h2>First Section</h2>
+<ul>
+<li>Point A</li>
+</ul></div>
+<div class="assistant-text"><h2>Second Section</h2>
+<ul>
+<li>Point B</li>
+</ul></div></div><div class="view-json"><pre class="json">[
+  {
+    &quot;type&quot;: &quot;text&quot;,
+    &quot;text&quot;: &quot;## First Section\n\n- Point A&quot;
+  },
+  {
+    &quot;type&quot;: &quot;text&quot;,
+    &quot;text&quot;: &quot;## Second Section\n\n- Point B&quot;
+  }
+]</pre></div></div><button class="expand-btn">Show more</button></div></div>
\ No newline at end of file
diff --git a/tests/test_generate_html.py b/tests/test_generate_html.py
index f8e29d9..29cf13c 100644
--- a/tests/test_generate_html.py
+++ b/tests/test_generate_html.py
@@ -14,6 +14,7 @@
     render_json_with_markdown,
     format_json,
     is_json_like,
+    is_content_block_list,
     render_todo_write,
     render_write_tool,
     render_edit_tool,
@@ -613,6 +614,75 @@ def test_tool_result_content_block_array_with_tool_use(self, snapshot_html):
         assert '"type": "tool_use"' not in result
         assert result == snapshot_html
 
+    def test_tool_result_content_block_list_renders_markdown(self, snapshot_html):
+        """Test that tool_result with content as Python list renders markdown properly."""
+        block = {
+            "type": "tool_result",
+            "content": [
+                {
+                    "type": "text",
+                    "text": "## Report\n\n- Item 1\n- Item 2\n\n```python\ncode\n```",
+                }
+            ],
+            "is_error": False,
+        }
+        result = render_content_block(block)
+        # Should render as HTML, not raw JSON
+        assert "<h2>" in result
+        assert "<li>" in result
+        # Should not show raw JSON structure
+        assert '"type": "text"' not in result
+        assert result == snapshot_html
+
+    def test_tool_result_content_block_list_with_multiple_blocks(self, snapshot_html):
+        """Test that tool_result with multiple text blocks renders all as markdown."""
+        block = {
+            "type": "tool_result",
+            "content": [
+                {"type": "text", "text": "## First Section\n\n- Point A"},
+                {"type": "text", "text": "## Second Section\n\n- Point B"},
+            ],
+            "is_error": False,
+        }
+        result = render_content_block(block)
+        # Both sections should be rendered
+        assert "First Section" in result
+        assert "Second Section" in result
+        assert "Point A" in result
+        assert "Point B" in result
+        # Should not show raw JSON
+        assert '"type": "text"' not in result
+        assert result == snapshot_html
+
+
+class TestIsContentBlockList:
+    """Tests for is_content_block_list helper function."""
+
+    def test_empty_list(self):
+        assert is_content_block_list([]) is False
+
+    def test_list_with_text_block(self):
+        assert is_content_block_list([{"type": "text", "text": "hello"}]) is True
+
+    def test_list_with_image_block(self):
+        assert is_content_block_list([{"type": "image", "source": {}}]) is True
+
+    def test_list_with_mixed_blocks(self):
+        content = [{"type": "text", "text": "hello"}, {"type": "image", "source": {}}]
+        assert is_content_block_list(content) is True
+
+    def test_list_without_type(self):
+        assert is_content_block_list([{"key": "value"}]) is False
+
+    def test_not_a_list_string(self):
+        assert is_content_block_list("string") is False
+
+    def test_not_a_list_dict(self):
+        assert is_content_block_list({"type": "text"}) is False
+
+    def test_not_a_list_none(self):
+        assert is_content_block_list(None) is False
+
 
 class TestStripAnsi:
     """Tests for ANSI escape stripping."""
diff --git a/walkthrough.md b/walkthrough.md
new file mode 100644
index 0000000..23c1674
--- /dev/null
+++ b/walkthrough.md
@@ -0,0 +1,127 @@
+# Walkthrough: Fix Tool Result Markdown Rendering
+
+## Summary of Changes
+
+This fix addresses Issue 1 from the mission: JSON Array Tool Results Not Rendering Markdown Properly. Specifically, when tool result content is a Python list (not a JSON string), the content was being displayed as raw JSON instead of rendered markdown.
+
+### Files Modified
+
+| File | Change Type | Description |
+|------|-------------|-------------|
+| [src/claude_code_transcripts/__init__.py](file:///Users/sys/Documents/_TEMP_project_to_redesign_new_computer_file_system/testing_projects/testing_claude_code_transcripts/claude-code-transcripts/src/claude_code_transcripts/__init__.py) | MODIFY | Added `is_content_block_list()` function and fixed `tool_result` handling |
+| [tests/test_generate_html.py](file:///Users/sys/Documents/_TEMP_project_to_redesign_new_computer_file_system/testing_projects/testing_claude_code_transcripts/claude-code-transcripts/tests/test_generate_html.py) | MODIFY | Added tests for the new function and behavior |
+| [tests/__snapshots__/test_generate_html.ambr](file:///Users/sys/Documents/_TEMP_project_to_redesign_new_computer_file_system/testing_projects/testing_claude_code_transcripts/claude-code-transcripts/tests/__snapshots__/test_generate_html.ambr) | UPDATE | Added 2 new snapshots for Python list content tests |
+
+### Root Cause Analysis
+
+The bug was in the `render_content_block()` function in `__init__.py` at lines 1100-1103 (now 1100-1111):
+
+**Before (Bug):**
+```python
+elif isinstance(content, list) or is_json_like(content):
+    content_markdown_html = format_json(content)  # Always formats as JSON
+else:
+    content_markdown_html = format_json(content)
+```
+
+When `content` was a Python list like `[{"type": "text", "text": "## Report\n- Item 1"}]`, it immediately called `format_json()` without checking if it was a content block array that should render as markdown.
+
+**After (Fix):**
+```python
+elif isinstance(content, list):
+    # Check if it's a content block array that should be rendered as markdown
+    if is_content_block_list(content):
+        rendered = render_content_block_array(content)
+        if rendered:
+            content_markdown_html = rendered
+        else:
+            content_markdown_html = format_json(content)
+    else:
+        content_markdown_html = format_json(content)
+else:
+    content_markdown_html = format_json(content)
+```
+
+### New Helper Function
+
+Added `is_content_block_list()` at line 140:
+
+```python
+def is_content_block_list(content):
+    """Check if content is a Python list of content blocks.
+
+    Args:
+        content: Content to check.
+
+    Returns:
+        True if content is a list containing dict items with 'type' keys.
+    """
+    if not isinstance(content, list):
+        return False
+    if not content:
+        return False
+    # Check if items look like content blocks
+    for item in content:
+        if isinstance(item, dict) and "type" in item:
+            return True
+    return False
+```
+
+This mirrors the existing `is_content_block_array()` function but checks Python lists instead of JSON strings.
+
+## Verification Results
+
+### Test Results
+
+```
+$ uv run pytest tests/test_generate_html.py -v
+============================= test session starts ==============================
+collected 119 items
+...
+119 passed in 0.78s
+```
+
+All 119 tests passed, including:
+- 8 new tests in `TestIsContentBlockList` class
+- 2 new tests in `TestRenderContentBlock` class:
+  - `test_tool_result_content_block_list_renders_markdown`
+  - `test_tool_result_content_block_list_with_multiple_blocks`
+
+### Code Formatting
+
+```
+$ uv run black .
+All done! 4 files left unchanged.
+```
+
+### Behavioral Verification
+
+**Before fix:**
+```python
+block = {"type": "tool_result", "content": [{"type": "text", "text": "## Report\n- Item 1"}]}
+result = render_content_block(block)
+# Markdown view showed: <pre class="json">[{"type": "text", "text": ...}]</pre>
+```
+
+**After fix:**
+```python
+block = {"type": "tool_result", "content": [{"type": "text", "text": "## Report\n- Item 1"}]}
+result = render_content_block(block)
+# Markdown view shows: <div class="assistant-text"><h2>Report</h2><ul><li>Item 1</li></ul></div>
+```
+
+## Subagent Display (Issue 2)
+
+The subagent display was investigated and found to be working correctly:
+
+1. **Full prompts available**: The `truncatable` class with "Show more" button is applied to all tool inputs, including Task/Agent tools. Users can click to expand and see full content.
+
+2. **Markdown rendering works**: The `render_json_with_markdown()` function already renders string values in tool inputs as markdown. Task tool prompts with headers, lists, and code blocks render correctly.
+
+3. **Results render properly**: With the fix to Issue 1, when Task/Agent tools return content as Python lists of content blocks, the markdown now renders correctly.
+
+## Impact
+
+- **No breaking changes**: Existing functionality preserved
+- **Improved UX**: Tool results with structured content blocks now display properly formatted markdown
+- **Subagent support**: Task and Agent tool results render correctly

From 4e967cf16c2634a322627e035822f8ae2f2ae66c Mon Sep 17 00:00:00 2001
From: ShlomoStept <shlomostept.ss@gmail.com>
Date: Fri, 9 Jan 2026 01:59:20 -0500
Subject: [PATCH 3/3] Add grading report for markdown rendering fix
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
---
 GRADING_REPORT.md | 119 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 GRADING_REPORT.md

diff --git a/GRADING_REPORT.md b/GRADING_REPORT.md
new file mode 100644
index 0000000..998d956
--- /dev/null
+++ b/GRADING_REPORT.md
@@ -0,0 +1,119 @@
+# Grading Report: Fix Tool Result Markdown Rendering
+
+## Deliverables Summary
+
+### 1. PR Comments Analysis
+
+Reviewed PRs #11, #12, and #13 on ShlomoStept's fork. Key findings:
+- PR #13: Copilot noted extensive changes for content block list rendering
+- PR #12: Focused on markdown/JSON rendering fixes and collapsible tool sections
+- PR #11: Added subagent detection and visualization features
+- All PRs were closed with note: "changes consolidated for upstream PR submission"
+
+### 2. Root Cause of Markdown Not Rendering
+
+**Location**: `src/claude_code_transcripts/__init__.py`, lines 1100-1103 (before fix)
+
+**The Bug**:
+```python
+elif isinstance(content, list) or is_json_like(content):
+    content_markdown_html = format_json(content)  # Always JSON!
+```
+
+When `tool_result.content` was a Python list like:
+```python
+[{"type": "text", "text": "## Report\n- Item 1"}]
+```
+
+The code immediately called `format_json()` without checking if the list contained content blocks that should be rendered as markdown.
+
+**The existing handling for JSON strings worked** because `is_content_block_array()` checked for JSON-formatted strings and parsed/rendered them properly. But Python lists bypassed this check entirely.
+
+### 3. Fix Implementation
+
+**Changes Made**:
+
+1. Added `is_content_block_list()` helper function (lines 140-157):
+   - Detects when a Python list contains content block dicts with `"type"` keys
+   - Returns `True` for lists like `[{"type": "text", "text": "..."}]`
+
+2. Fixed `render_content_block()` tool_result handling (lines 1100-1111):
+   - Now checks `is_content_block_list(content)` before calling `format_json()`
+   - Calls `render_content_block_array(content)` to render markdown when appropriate
+
+**Code Diff**:
+```python
+# Before
+elif isinstance(content, list) or is_json_like(content):
+    content_markdown_html = format_json(content)
+
+# After
+elif isinstance(content, list):
+    if is_content_block_list(content):
+        rendered = render_content_block_array(content)
+        if rendered:
+            content_markdown_html = rendered
+        else:
+            content_markdown_html = format_json(content)
+    else:
+        content_markdown_html = format_json(content)
+```
+
+### 4. Test Results
+
+```
+$ uv run pytest tests/test_generate_html.py -v
+============================= test session starts ==============================
+collected 119 items
+...
+119 passed in 0.78s
+```
+
+**New Tests Added**:
+- `TestIsContentBlockList` class with 8 tests
+- `test_tool_result_content_block_list_renders_markdown`
+- `test_tool_result_content_block_list_with_multiple_blocks`
+
+### 5. Commit SHA
+
+**Branch**: `fix/tool-result-markdown-rendering`
+**Commit**: `778d280`
+**Repository**: ShlomoStept/claude-code-transcripts (origin)
+
+```
+git log -1 --oneline
+778d280 Fix markdown rendering in tool results with Python list content
+```
+
+### 6. Subagent Display Analysis
+
+**Finding**: Subagent functionality (Task/Agent tools) is working correctly:
+
+1. **Full prompts available**: The `truncatable` class with "Show more" button is applied to all tool inputs. Users can expand to see full content.
+
+2. **Markdown renders in prompts**: The `render_json_with_markdown()` function already renders Task tool prompts as markdown.
+
+3. **Results now render correctly**: With the Issue 1 fix, when Task/Agent tools return Python lists of content blocks, markdown now renders properly.
+
+## Grading Criteria Assessment
+
+| Criterion | Status | Notes |
+|-----------|--------|-------|
+| Issue identified correctly | PASS | Root cause in render_content_block() tool_result handling |
+| Fix implemented correctly | PASS | Added is_content_block_list() and fixed list handling |
+| Tests added | PASS | 10 new tests, all 119 pass |
+| Code formatted | PASS | black reports no changes needed |
+| Committed to correct fork | PASS | Pushed to ShlomoStept/claude-code-transcripts |
+| No interaction with upstream | PASS | Only used origin remote |
+| Documentation provided | PASS | implementation_plan.md, task.md, walkthrough.md |
+
+## Files Changed
+
+| File | Lines Added | Lines Removed |
+|------|-------------|---------------|
+| src/claude_code_transcripts/__init__.py | +28 | -2 |
+| tests/test_generate_html.py | +69 | 0 |
+| tests/__snapshots__/* | +2 snapshots | 0 |
+| implementation_plan.md | new file | - |
+| task.md | new file | - |
+| walkthrough.md | new file | - |