docs-output-filter 0.1.0

Filter documentation build output (MkDocs, Sphinx) to show only warnings and errors with nice formatting

docs-output-filter

Filter documentation build output to show only what matters: warnings and errors.

Works with MkDocs and Sphinx (including sphinx-autobuild, Jupyter Book, myst-nb). Includes an MCP server for AI code assistant integration (Claude Code, etc.).

Before & After

❌ Raw build output (43 lines)

✅ Filtered output (15 lines)

INFO - Building documentation... INFO - Cleaning site directory INFO - Log level set to INFO INFO - Building documentation to directory: /project/site INFO - MERMAID2 - Initialization arguments: {} INFO - Generating index pages... INFO - Reading page 'index.md' INFO - Reading page 'guide/getting-started.md' INFO - Reading page 'guide/configuration.md' INFO - Reading page 'api/reference.md' INFO - Copying static files from theme: material INFO - Copying 'assets/stylesheets/extra.css' INFO - Copying 'assets/javascripts/extra.js' [git-revision-date-localized-plugin] has no git logs INFO - Executing code blocks with markdown_exec... WARNING - markdown_exec: Execution of python code block exited with errors Code block is: import numpy as np data = np.random.rand(10, 10) raise ValueError("INTENTIONAL TEST ERROR") Output is: Traceback (most recent call last): File "<code block: session test; n1>", line 3 raise ValueError("INTENTIONAL TEST ERROR") ValueError: INTENTIONAL TEST ERROR WARNING - [git-revision] Unable to read git logs INFO - Rendering 'index.md' INFO - Rendering 'guide/getting-started.md' INFO - Rendering 'guide/configuration.md' INFO - Rendering 'api/reference.md' INFO - Building search index... INFO - Writing 'sitemap.xml' INFO - Writing 'search/search_index.json' INFO - Documentation built in 12.34 seconds

⚠ WARNING [markdown_exec] ValueError: INTENTIONAL TEST ERROR 📍 session 'test' → line 3 ╭──────────────── Code Block ─────────────────╮ │ 1 import numpy as np │ │ 2 data = np.random.rand(10, 10) │ │ 3 raise ValueError("INTENTIONAL TEST E...")│ ╰─────────────────────────────────────────────╯ ╭─────────── Error Output ────────────╮ │ ValueError: INTENTIONAL TEST ERROR │ ╰───────── use -v for full traceback ─╯ ⚠ WARNING [git-revision] Unable to read git logs Summary: 2 warning(s) 🌐 Server: http://127.0.0.1:8000/ 📁 Output: /project/site Built in 12.34s

Installation

# With uv (recommended)
uv tool install docs-output-filter

# With pip
pip install docs-output-filter

Usage

# Wrapper mode (recommended) — just prefix your build command
docs-output-filter -- mkdocs build
docs-output-filter -- mkdocs serve --livereload
docs-output-filter -- sphinx-autobuild docs _build/html

# Pipe mode — traditional Unix pipe
mkdocs build 2>&1 | docs-output-filter
sphinx-build docs _build 2>&1 | docs-output-filter

# Process a remote build log (e.g., ReadTheDocs)
docs-output-filter --url https://app.readthedocs.org/projects/myproject/builds/12345/

Tip: Wrapper mode (--) is the easiest way to use docs-output-filter. It runs the command for you, automatically captures both stdout and stderr, and fixes buffering issues with sphinx-autobuild. No 2>&1 needed.

Note: If using pipe mode, 2>&1 is important — Sphinx writes warnings to stderr. Without it, warnings bypass the filter.

Note: Use --livereload with mkdocs serve due to a Click 8.3.x bug.

Features

Feature	Description
Multi-tool support	MkDocs and Sphinx with auto-detection
Filtered output	Shows WARNING and ERROR messages, hides routine INFO
Code blocks	Syntax-highlighted code for markdown_exec and myst-nb errors
Location info	File, line number, session name, warning codes
Streaming mode	Real-time output for mkdocs serve / sphinx-autobuild with rebuild detection
Interactive mode	Toggle between raw/filtered with keyboard (-i)
Remote logs	Fetch and parse build logs from ReadTheDocs and other CI
MCP server	API for AI code assistants like Claude Code

Options

Flag	Description
-- COMMAND	Run command as subprocess (recommended, no 2>&1 needed)
-v, --verbose	Show full tracebacks and code blocks
-e, --errors-only	Hide warnings, show only errors
--no-color	Disable colored output
--raw	Pass through unfiltered build output
-i, --interactive	Toggle raw/filtered with keyboard
--url URL	Fetch and process a remote build log
--tool mkdocs|sphinx|auto	Force build tool detection (default: auto)
--share-state	Write state for MCP server integration

MCP Server (for AI Assistants)

Enable AI code assistants to access build issues:

# Terminal 1: Run build tool with state sharing
mkdocs serve --livereload 2>&1 | docs-output-filter --share-state

# Terminal 2: AI assistant connects via MCP
docs-output-filter --mcp --watch

Add to Claude Code's MCP config (.claude/settings.local.json):

{
  "mcpServers": {
    "docs-output-filter": {
      "command": "docs-output-filter",
      "args": ["--mcp", "--watch"]
    }
  }
}

Documentation

Full documentation: https://ianhi.github.io/docs-output-filter/

Development

git clone https://github.com/ianhi/docs-output-filter
cd docs-output-filter
uv sync
uv run pre-commit install
uv run pytest

License

MIT