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@jannismain
Created January 21, 2026 10:32
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Agent session: includex - `hatch run test` fails. How can I fix it?
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>includex - Agent Session</title>
<style>
:root {
--bg: #0d1117;
--surface: #161b22;
--surface-hover: #21262d;
--border: #30363d;
--text: #e6edf3;
--text-muted: #8b949e;
--accent: #58a6ff;
--accent-muted: #388bfd;
--user-bg: #1c2128;
--assistant-bg: #1a1f26;
--success: #3fb950;
--warning: #d29922;
--tool-bg: #1a2332;
--thinking-bg: #1f1a24;
--agent-accent: #9d7cd8;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Consolas', monospace;
background: var(--bg);
color: var(--text);
line-height: 1.5;
}
/* Header */
header {
background: var(--surface);
border-bottom: 1px solid var(--border);
padding: 16px 24px;
position: sticky;
top: 0;
z-index: 100;
}
.header-content {
max-width: 900px;
margin: 0 auto;
display: flex;
align-items: center;
justify-content: space-between;
flex-wrap: wrap;
gap: 12px;
}
.header-left {
display: flex;
flex-direction: column;
gap: 4px;
}
h1 {
font-size: 1.1rem;
font-weight: 600;
color: var(--text);
}
.session-meta {
font-size: 0.8rem;
color: var(--text-muted);
display: flex;
gap: 12px;
flex-wrap: wrap;
}
.session-meta .agent-name {
color: #d4a574;
}
.session-meta .agent-name.codex {
color: #7dd3fc;
}
.controls {
display: flex;
gap: 12px;
align-items: center;
}
/* CSS-only toggle buttons using checkbox hack */
.toggle-input {
position: absolute;
opacity: 0;
pointer-events: none;
}
.toggle-label {
display: inline-flex;
align-items: center;
gap: 6px;
padding: 6px 12px;
background: var(--surface-hover);
border: 1px solid var(--border);
border-radius: 6px;
color: var(--text);
cursor: pointer;
font-size: 0.85rem;
user-select: none;
transition: background 0.15s, border-color 0.15s;
}
.toggle-label:hover {
background: var(--border);
}
.toggle-input:checked + .toggle-label {
background: var(--accent-muted);
border-color: var(--accent);
}
.toggle-indicator {
display: inline-block;
width: 8px;
height: 8px;
border-radius: 50%;
background: var(--text-muted);
transition: background 0.15s;
}
.toggle-input:checked + .toggle-label .toggle-indicator {
background: var(--text);
}
/* Main content */
main {
max-width: 900px;
margin: 0 auto;
padding: 24px;
}
.messages {
display: flex;
flex-direction: column;
gap: 16px;
}
.message {
padding: 16px;
border-radius: 8px;
border: 1px solid var(--border);
}
.message.user {
background: var(--user-bg);
border-left: 3px solid var(--accent);
}
.message.assistant {
background: var(--assistant-bg);
border-left: 3px solid var(--agent-accent);
}
.message-header {
display: flex;
justify-content: space-between;
margin-bottom: 8px;
font-size: 0.8rem;
}
.message-role {
font-weight: 600;
text-transform: uppercase;
letter-spacing: 0.5px;
}
.message.user .message-role { color: var(--accent); }
.message.assistant .message-role { color: var(--agent-accent); }
.message-time { color: var(--text-muted); }
.message-content {
white-space: pre-wrap;
word-break: break-word;
font-size: 0.9rem;
}
.message-content code {
background: var(--bg);
padding: 2px 6px;
border-radius: 4px;
font-family: inherit;
font-size: 0.85em;
}
.message-content pre {
background: var(--bg);
padding: 12px;
border-radius: 6px;
overflow-x: auto;
margin: 12px 0;
}
.message-content pre code {
background: none;
padding: 0;
}
/* Thinking blocks - hidden by default */
.thinking-block {
background: var(--thinking-bg);
border-left: 2px solid #8b5cf6;
padding: 12px;
margin: 8px 0;
border-radius: 4px;
font-style: italic;
color: var(--text-muted);
display: none;
}
.thinking-label {
font-size: 0.75rem;
font-weight: 600;
color: #8b5cf6;
text-transform: uppercase;
letter-spacing: 0.5px;
margin-bottom: 4px;
font-style: normal;
}
/* Messages that only contain thinking content */
.message.thinking-only {
display: none;
}
/* When thinking toggle is checked, show thinking blocks */
#thinking-toggle:checked ~ main .thinking-block {
display: block;
}
#thinking-toggle:checked ~ main .message.thinking-only {
display: block;
}
.tool-block {
background: var(--tool-bg);
border-left: 2px solid var(--warning);
padding: 8px 12px;
margin: 8px 0;
border-radius: 4px;
font-size: 0.85rem;
}
/* Sort order toggle - reverse message order when checked */
#sort-toggle:checked ~ main .messages {
flex-direction: column-reverse;
}
/* Footer */
footer {
max-width: 900px;
margin: 40px auto;
padding: 16px 24px;
border-top: 1px solid var(--border);
font-size: 0.8rem;
color: var(--text-muted);
text-align: center;
}
footer a {
color: var(--accent);
text-decoration: none;
}
footer a:hover {
text-decoration: underline;
}
/* Responsive */
@media (max-width: 600px) {
header {
padding: 12px 16px;
}
main {
padding: 16px;
}
.header-content {
flex-direction: column;
align-items: flex-start;
}
}
</style>
</head>
<body>
<!-- CSS-only toggles using the checkbox hack -->
<input type="checkbox" id="thinking-toggle" class="toggle-input">
<input type="checkbox" id="sort-toggle" class="toggle-input">
<header>
<div class="header-content">
<div class="header-left">
<h1>includex</h1>
<div class="session-meta">
<span class="agent-name claude">Claude</span>
<span>16 messages</span>
<span>2026-01-07 12:45:24</span>
</div>
</div>
<div class="controls">
<label for="thinking-toggle" class="toggle-label">
<span class="toggle-indicator"></span>
Thinking
</label>
<label for="sort-toggle" class="toggle-label">
<span class="toggle-indicator"></span>
Newest first
</label>
</div>
</div>
</header>
<main>
<div class="messages">
<div class="message user" data-index="0">
<div class="message-header">
<span class="message-role">user</span>
<span class="message-time">2026-01-07 12:45:24</span>
</div>
<div class="message-content"><code>hatch run test</code> fails. How can I fix it?</div>
</div>
<div class="message assistant thinking-only" data-index="1">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:45:30</span>
</div>
<div class="message-content"><div class="thinking-block"><div class="thinking-label">Thinking</div>The user says that <code>hatch run test</code> fails and wants to know how to fix it. They've also opened the file <code>pyproject.toml</code> in their IDE, which is likely related to this issue since Hatch uses <code>pyproject.toml</code> for configuration.
Let me start by:
1. Running the command to see what the actual error is
2. Reading the pyproject.toml file to understand the configuration
3. Based on the error, determine what needs to be fixed
Let me run the command first to see what the error is.</div></div>
</div>
<div class="message assistant" data-index="2">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:45:31</span>
</div>
<div class="message-content">I'll help you fix the <code>hatch run test</code> issue. Let me first run the command to see what error we're getting, and check your project configuration.</div>
</div>
<div class="message assistant" data-index="3">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:45:31</span>
</div>
<div class="message-content"><div class="tool-block">[Bash: Run test command to see error]
$ hatch run test</div></div>
</div>
<div class="message assistant" data-index="4">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:45:32</span>
</div>
<div class="message-content"><div class="tool-block">[Read: /Users/main/projects/includex/pyproject.toml]</div></div>
</div>
<div class="message assistant thinking-only" data-index="5">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:45:45</span>
</div>
<div class="message-content"><div class="thinking-block"><div class="thinking-label">Thinking</div>The error is clear - hatchling (the build backend) can't determine which files to ship inside the wheel. The error message says:
<pre><code>ValueError: Unable to determine which files to ship inside the wheel using the following heuristics:
https://hatch.pypa.io/latest/plugins/builder/wheel/#default-file-selection
The most likely cause of this is that there is no directory that matches the name of your project (mkdocs_macros_includex).
</code></pre>
The project name is <code>mkdocs-macros-includex</code> (with dashes), but hatchling is looking for a directory named <code>mkdocs_macros_includex</code> (with underscores).
Looking at the pyproject.toml, I can see:
- The project name is <code>mkdocs-macros-includex</code>
- There's a line 14: <code>py_modules=[&quot;includex&quot;]</code> which is a setuptools configuration (not hatchling)
- The version is being read from <code>includex.py</code> (line 20)
So it seems like the actual Python module is just <code>includex.py</code> (a single file module, not a package directory).
The fix is to tell hatchling which files to include. Since this is a single-file module (<code>includex.py</code>), we need to add a configuration in the <code>[tool.hatch.build.targets.wheel]</code> section to specify the packages or py-modules.
Let me check if there's an <code>includex.py</code> file:</div></div>
</div>
<div class="message assistant" data-index="6">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:45:47</span>
</div>
<div class="message-content">I can see the issue. The build is failing because hatchling can't determine which files to package. The error indicates that hatchling is looking for a directory matching the project name (<code>mkdocs_macros_includex</code>), but your project appears to be a single-file module (<code>includex.py</code>).
Let me check the project structure:</div>
</div>
<div class="message assistant" data-index="7">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:45:47</span>
</div>
<div class="message-content"><div class="tool-block">[Bash: List Python files in root directory]
$ ls -la *.py</div></div>
</div>
<div class="message assistant" data-index="8">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:46:29</span>
</div>
<div class="message-content"><div class="thinking-block"><div class="thinking-label">Thinking</div>The user confirms I'm right and wants to know how to configure hatch to work with the single <code>includex</code> module.
Looking at the pyproject.toml again, there's a line 14:
<pre><code>[tool.setuptools]
py_modules=[&quot;includex&quot;]
</code></pre>
This is setuptools configuration, not hatchling configuration. Since the project is using hatchling as the build backend (line 3), we need to configure hatchling properly.
For hatchling, we need to add a <code>[tool.hatch.build.targets.wheel]</code> section and specify the py-modules. The configuration should be:
<pre><code>[tool.hatch.build.targets.wheel]
packages = [&quot;includex.py&quot;]
</code></pre>
Or we can use:
<pre><code>[tool.hatch.build.targets.wheel]
only-include = [&quot;includex.py&quot;]
</code></pre>
Actually, looking at the hatchling documentation, for py-modules (single file modules), the correct way is to use the <code>packages</code> option with the filename. Let me provide the fix.</div></div>
</div>
<div class="message assistant" data-index="9">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:46:30</span>
</div>
<div class="message-content">You need to configure hatchling (not setuptools) to package the single <code>includex.py</code> module. The issue is that line 13-14 has setuptools configuration, but your build backend is hatchling.
Here's the fix - replace the setuptools configuration with hatchling configuration:</div>
</div>
<div class="message assistant" data-index="10">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:46:32</span>
</div>
<div class="message-content"><div class="tool-block">[Edit: /Users/main/projects/includex/pyproject.toml]</div></div>
</div>
<div class="message assistant thinking-only" data-index="11">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:46:41</span>
</div>
<div class="message-content"><div class="thinking-block"><div class="thinking-label">Thinking</div>Good! I've made the edit. Now let me test if this fixes the issue by running <code>hatch run test</code> again.</div></div>
</div>
<div class="message assistant" data-index="12">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:46:41</span>
</div>
<div class="message-content">Now let's test if this fixes the issue:</div>
</div>
<div class="message assistant" data-index="13">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:46:42</span>
</div>
<div class="message-content"><div class="tool-block">[Bash: Run test command to verify fix]
$ hatch run test</div></div>
</div>
<div class="message assistant thinking-only" data-index="14">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:47:09</span>
</div>
<div class="message-content"><div class="thinking-block"><div class="thinking-label">Thinking</div>Perfect! The tests are now running successfully. The fix worked - by adding the <code>[tool.hatch.build.targets.wheel]</code> section with <code>packages = [&quot;includex.py&quot;]</code>, hatchling now knows which file to package.
The tests ran across multiple Python versions (3.8, 3.9, 3.10, 3.11) and all passed with 97% coverage. The only environment that was skipped was Python 3.7 because it's not installed on the system.</div></div>
</div>
<div class="message assistant" data-index="15">
<div class="message-header">
<span class="message-role">assistant</span>
<span class="message-time">2026-01-07 12:47:12</span>
</div>
<div class="message-content">Perfect! The fix worked. The tests are now running successfully across Python 3.8, 3.9, 3.10, and 3.11 (3.7 was skipped because it's not installed on your system).
**What was the issue?**
Your <code>pyproject.toml</code> had <code>[tool.setuptools]</code> configuration (line 13-14), but your build backend is <code>hatchling</code>, not setuptools. Hatchling couldn't auto-detect which files to package.
**The fix:**
I replaced the setuptools configuration with the proper hatchling configuration:
<pre><code>[tool.hatch.build.targets.wheel]
packages = [&quot;includex.py&quot;]
</code></pre>
This tells hatchling to include the <code>includex.py</code> module in the wheel package. All 76 tests now pass with 97% coverage.</div>
</div>
</div>
</main>
<footer>
Exported from <a href="https://github.com/wesm/agent-session-viewer">Agent Session Viewer</a>
</footer>
</body>
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