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<p align="center">
<img src="https://em-content.zobj.net/source/apple/391/rock_1faa8.png" width="80" />
</p>
<h1 align="center">caveman-compress</h1>
<p align="center">
<strong>shrink memory file. save token every session.</strong>
</p>
---
A Claude Code skill that compresses project memory files (`CLAUDE.md`, todos,
preferences) into caveman format, reducing repeated input size.
Claude loads `CLAUDE.md` on every session start, so large files add repeated
input tokens. Caveman shortens supported natural-language files.
## What It Do
```
/caveman-compress CLAUDE.md
```
```
CLAUDE.md ← compressed (Claude reads smaller file each session)
CLAUDE.original.md ← human-readable backup (you edit this)
```
Original remains in data directory rather than next to live file, so skill
auto-loaders do not read it twice. Path is
`$XDG_DATA_HOME/caveman-compress/backups/<parent-dir-name>/` on macOS and Linux,
or `%LOCALAPPDATA%\caveman-compress\backups\<parent-dir-name>\` on Windows. Edit
`.original.md` there, then run skill again to re-compress.
## Benchmarks
Real results on real project files:
| File | Original | Compressed | Saved |
|------|----------:|----------:|------:|
| `claude-md-preferences.md` | 706 | 285 | 59.6% |
| `project-notes.md` | 1145 | 535 | 53.3% |
| `claude-md-project.md` | 1122 | 636 | 43.3% |
| `todo-list.md` | 627 | 388 | 38.1% |
| `mixed-with-code.md` | 888 | 560 | 36.9% |
| Average | 898 | 481 | 46% |
All fixture validations passed: headings, code blocks, URLs, and file paths were
preserved exactly.
## Before / After
<table>
<tr>
<td width="50%">
### Original (706 tokens)
> "I strongly prefer TypeScript with strict mode enabled for all new code. Please don't use `any` type unless there's genuinely no way around it, and if you do, leave a comment explaining the reasoning. I find that taking the time to properly type things catches a lot of bugs before they ever make it to runtime."
</td>
<td width="50%">
### <img src="../../docs/assets/dancing-rock.svg" width="20" height="20" alt="rock"/> Caveman (285 tokens)
> "Prefer TypeScript strict mode always. No `any` unless unavoidable; comment why if used. Proper types catch bugs early."
</td>
</tr>
</table>
This fixture produced 59.6% fewer counted tokens. Structural validation passed;
result does not prove semantic equivalence on other files or models.
## Security
`caveman-compress` is flagged as Snyk High Risk due to subprocess and file I/O
patterns detected by static analysis. See [SECURITY.md](./SECURITY.md) for why
these operations exist and how paths are constrained.
## Install
Compress is built in with the `caveman` plugin. Install `caveman` once, then use `/caveman-compress`.
If you need local files, the compress skill lives at:
```bash
skills/caveman-compress/
```
Requires Python 3.10 or newer.
## Usage
```
/caveman-compress <filepath>
```
Examples:
```
/caveman-compress CLAUDE.md
/caveman-compress docs/preferences.md
/caveman-compress todos.md
```
### What files work
| Type | Compress? |
|------|-----------|
| `.md`, `.txt`, `.rst`, `.typ`, `.typst`, `.tex` | Yes |
| Extensionless natural language | Yes |
| `.py`, `.js`, `.ts`, `.json`, `.yaml` | ❌ Skip (code/config) |
| `*.original.md` | ❌ Skip (backup files) |
## How It Work
```
/caveman-compress CLAUDE.md
↓
detect file type (no tokens)
↓
Claude compresses (tokens: one call)
↓
validate output (no tokens)
checks: headings, code blocks, URLs, file paths, bullets
↓
if errors: Claude fixes cherry-picked issues only (tokens: targeted fix)
does NOT recompress; only patches broken parts
↓
retry up to 2 times
↓
write compressed → CLAUDE.md
write original → CLAUDE.original.md
```
Only two things use tokens: initial compression + targeted fix if validation fails. Everything else is local Python.
## What Is Preserved
Caveman compress natural language. It never touch:
- Code blocks (` ``` ` fenced or indented)
- Inline code (`` `backtick content` ``)
- URLs and links
- File paths (`/src/components/...`)
- Commands (`npm install`, `git commit`)
- Technical terms, library names, API names
- Headings (exact text preserved)
- Tables (structure preserved, cell text compressed)
- Dates, version numbers, numeric values
## Why This Matter
`CLAUDE.md` loads on every session start. A 1,000-token project memory file adds
1,000 input tokens each time project opens, or 100,000 across 100 sessions.
Caveman reduced counted tokens by about 46% on five listed fixtures. Validators
confirmed headings, code blocks, URLs, and file paths. They did not establish
general semantic or task-quality equivalence.
```
┌────────────────────────────────────────────┐
│ TOKEN SAVINGS PER FILE █████ 46% │
│ FIXTURES IN TABLE 5 │
│ STRUCTURAL VALIDATION passed on all │
│ SETUP TIME █ 1x │
└────────────────────────────────────────────┘
```
## Part of Caveman
This skill is part of the [caveman](https://github.com/JuliusBrussee/caveman) toolkit.
- `caveman`: ask Claude to answer in shorter prose
- `caveman-compress`: shorten supported project-memory files with backups and validation

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# Security
## Snyk High Risk Rating
`caveman-compress` receives a Snyk High Risk rating due to static analysis heuristics. This document explains what the skill does and does not do.
### What triggers the rating
1. **subprocess usage**: The skill calls the `claude` CLI via `subprocess.run()` as a fallback when `ANTHROPIC_API_KEY` is not set. The subprocess call uses a fixed argument list — no shell interpolation occurs. User file content is passed via stdin, not as a shell argument.
2. **File read/write**: The skill reads the file the user explicitly points it at, compresses it, and writes the result back to the same path. A `.original.md` backup is saved to an out-of-tree data dir (`$XDG_DATA_HOME/caveman-compress/backups/<parent-dir-name>/`, or `%LOCALAPPDATA%\caveman-compress\backups\<parent-dir-name>\` on Windows). Beyond the target file and that backup location, no files are read or written.
### What the skill does NOT do
- Does not execute user file content as code
- Does not make network requests except to Anthropic's API (via SDK or CLI)
- Does not access files outside the path the user provides
- Does not use shell=True or string interpolation in subprocess calls
- Does not collect or transmit any data beyond the file being compressed
### Auth behavior
If `ANTHROPIC_API_KEY` is set, the skill uses the Anthropic Python SDK directly (no subprocess). If not set, it falls back to the `claude` CLI, which uses the user's existing Claude desktop authentication.
### File size limit
Files larger than 500KB are rejected before any API call is made.
### Reporting a vulnerability
If you believe you've found a genuine security issue, please open a GitHub issue with the label `security`.

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---
name: caveman-compress
description: >
Compress natural language memory files (CLAUDE.md, todos, preferences) into caveman format
to save input tokens. Preserves all technical substance, code, URLs, and structure.
Compressed version overwrites the original file. Human-readable backup saved as FILE.original.md.
Trigger: /caveman-compress FILEPATH or "compress memory file"
---
# Caveman Compress
## Purpose
Compress natural language files (CLAUDE.md, todos, preferences) into caveman-speak to reduce input tokens. Compressed version overwrites original. Human-readable backup saved as `<filename>.original.md`, but NOT beside the source file — it lives in an out-of-tree data dir (`$XDG_DATA_HOME/caveman-compress/backups/<parent-dir-name>/`, or `%LOCALAPPDATA%\caveman-compress\backups\<parent-dir-name>\` on Windows) so skill auto-loaders don't re-ingest it as a live file.
## Trigger
`/caveman-compress <filepath>` or when user asks to compress a memory file.
## Process
1. The compression scripts live in `scripts/` (adjacent to this SKILL.md). If the path is not immediately available, search for `scripts/__main__.py` next to this SKILL.md.
2. From the directory containing this SKILL.md, run:
python3 -m scripts <absolute_filepath>
3. The CLI will:
- detect file type (no tokens)
- call Claude to compress
- validate output (no tokens)
- if errors: cherry-pick fix with Claude (targeted fixes only, no recompression)
- retry up to 2 times
- if still failing after 2 retries: report error to user, leave original file untouched
4. Return result to user
## Compression Rules
### Remove
- Articles: a, an, the
- Filler: just, really, basically, actually, simply, essentially, generally
- Pleasantries: "sure", "certainly", "of course", "happy to", "I'd recommend"
- Hedging: "it might be worth", "you could consider", "it would be good to"
- Redundant phrasing: "in order to" → "to", "make sure to" → "ensure", "the reason is because" → "because"
- Connective fluff: "however", "furthermore", "additionally", "in addition"
### Preserve EXACTLY (never modify)
- Code blocks (fenced ``` and indented)
- Inline code (`backtick content`)
- URLs and links (full URLs, markdown links)
- File paths (`/src/components/...`, `./config.yaml`)
- Commands (`npm install`, `git commit`, `docker build`)
- Technical terms (library names, API names, protocols, algorithms)
- Proper nouns (project names, people, companies)
- Dates, version numbers, numeric values
- Environment variables (`$HOME`, `NODE_ENV`)
### Preserve Structure
- All markdown headings (keep exact heading text, compress body below)
- Bullet point hierarchy (keep nesting level)
- Numbered lists (keep numbering)
- Tables (compress cell text, keep structure)
- Frontmatter/YAML headers in markdown files
### Compress
- Use short synonyms: "big" not "extensive", "fix" not "implement a solution for", "use" not "utilize"
- Fragments OK: "Run tests before commit" not "You should always run tests before committing"
- Drop "you should", "make sure to", "remember to" — just state the action
- Merge redundant bullets that say the same thing differently
- Keep one example where multiple examples show the same pattern
CRITICAL RULE:
Anything inside ``` ... ``` must be copied EXACTLY.
Do not:
- remove comments
- remove spacing
- reorder lines
- shorten commands
- simplify anything
Inline code (`...`) must be preserved EXACTLY.
Do not modify anything inside backticks.
If file contains code blocks:
- Treat code blocks as read-only regions
- Only compress text outside them
- Do not merge sections around code
## Pattern
Original:
> You should always make sure to run the test suite before pushing any changes to the main branch. This is important because it helps catch bugs early and prevents broken builds from being deployed to production.
Compressed:
> Run tests before push to main. Catch bugs early, prevent broken prod deploys.
Original:
> The application uses a microservices architecture with the following components. The API gateway handles all incoming requests and routes them to the appropriate service. The authentication service is responsible for managing user sessions and JWT tokens.
Compressed:
> Microservices architecture. API gateway route all requests to services. Auth service manage user sessions + JWT tokens.
## Boundaries
- ONLY compress natural language files (.md, .txt, .typ, .typst, .tex, extensionless)
- NEVER modify: .py, .js, .ts, .json, .yaml, .yml, .toml, .env, .lock, .css, .html, .xml, .sql, .sh
- If file has mixed content (prose + code), compress ONLY the prose sections
- If unsure whether something is code or prose, leave it unchanged
- Original file is backed up as FILE.original.md before overwriting — in the out-of-tree backup data dir (see Purpose), not beside the source file
- Never compress FILE.original.md (skip it)

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"""Caveman compress scripts.
This package provides tools to compress natural language markdown files
into caveman format to save input tokens.
"""
__all__ = ["cli", "compress", "detect", "validate"]
__version__ = "1.0.0"

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from .cli import main
main()

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#!/usr/bin/env python3
from pathlib import Path
import sys
# Support both direct execution and module import
try:
from .validate import validate
except ImportError:
sys.path.insert(0, str(Path(__file__).parent))
from validate import validate
try:
import tiktoken
_enc = tiktoken.get_encoding("o200k_base")
except ImportError:
_enc = None
def count_tokens(text):
if _enc is None:
return len(text.split()) # fallback: word count
return len(_enc.encode(text))
def benchmark_pair(orig_path: Path, comp_path: Path):
orig_text = orig_path.read_text(encoding="utf-8", errors="ignore")
comp_text = comp_path.read_text(encoding="utf-8", errors="ignore")
orig_tokens = count_tokens(orig_text)
comp_tokens = count_tokens(comp_text)
saved = 100 * (orig_tokens - comp_tokens) / orig_tokens if orig_tokens > 0 else 0.0
result = validate(orig_path, comp_path)
return (comp_path.name, orig_tokens, comp_tokens, saved, result.is_valid)
def print_table(rows):
print("\n| File | Original | Compressed | Saved % | Valid |")
print("|------|----------|------------|---------|-------|")
for r in rows:
print(f"| {r[0]} | {r[1]} | {r[2]} | {r[3]:.1f}% | {'✅' if r[4] else '❌'} |")
def main():
# Direct file pair: python3 benchmark.py original.md compressed.md
if len(sys.argv) == 3:
orig = Path(sys.argv[1]).resolve()
comp = Path(sys.argv[2]).resolve()
if not orig.exists():
print(f"❌ Not found: {orig}")
sys.exit(1)
if not comp.exists():
print(f"❌ Not found: {comp}")
sys.exit(1)
print_table([benchmark_pair(orig, comp)])
return
# Glob mode: repo_root/tests/caveman-compress/
# __file__ lives at <repo_root>/skills/caveman-compress/scripts/benchmark.py
# Walk up four dirs: scripts → caveman-compress → skills → repo_root.
tests_dir = Path(__file__).resolve().parents[3] / "tests" / "caveman-compress"
if not tests_dir.exists():
print(f"❌ Tests dir not found: {tests_dir}")
sys.exit(1)
rows = []
for orig in sorted(tests_dir.glob("*.original.md")):
comp = orig.with_name(orig.stem.removesuffix(".original") + ".md")
if comp.exists():
rows.append(benchmark_pair(orig, comp))
if not rows:
print("No compressed file pairs found.")
return
print_table(rows)
if __name__ == "__main__":
main()

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#!/usr/bin/env python3
"""
Caveman Compress CLI
Usage:
caveman <filepath>
"""
import sys
# Force UTF-8 on stdout/stderr before any code can print. Windows consoles
# default to cp1252 and crash on the ❌ glyphs in error/validation branches,
# masking the real error and leaving the user with a half-compressed file.
for _stream in (sys.stdout, sys.stderr):
reconfigure = getattr(_stream, "reconfigure", None)
if callable(reconfigure):
try:
reconfigure(encoding="utf-8", errors="replace")
except Exception:
pass
from pathlib import Path
from .compress import backup_dir_for, compress_file
from .detect import detect_file_type, should_compress
def print_usage():
print("Usage: caveman <filepath>")
def main():
if len(sys.argv) != 2:
print_usage()
sys.exit(1)
filepath = Path(sys.argv[1])
# Check file exists
if not filepath.exists():
print(f"❌ File not found: {filepath}")
sys.exit(1)
if not filepath.is_file():
print(f"❌ Not a file: {filepath}")
sys.exit(1)
filepath = filepath.resolve()
# Detect file type
file_type = detect_file_type(filepath)
print(f"Detected: {file_type}")
# Check if compressible
if not should_compress(filepath):
print("Skipping: file is not natural language (code/config)")
sys.exit(0)
print("Starting caveman compression...\n")
try:
success = compress_file(filepath)
if success:
print("\nCompression completed successfully")
backup_path = backup_dir_for(filepath) / (filepath.stem + ".original.md")
print(f"Compressed: {filepath}")
print(f"Original: {backup_path}")
sys.exit(0)
else:
print("\n❌ Compression failed after retries")
sys.exit(2)
except KeyboardInterrupt:
print("\nInterrupted by user")
sys.exit(130)
except Exception as e:
print(f"\n❌ Error: {e}")
sys.exit(1)
if __name__ == "__main__":
main()

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#!/usr/bin/env python3
"""
Caveman Memory Compression Orchestrator
Usage:
python scripts/compress.py <filepath>
"""
import os
import re
import shutil
import stat
import subprocess
import sys
import tempfile
from pathlib import Path
from typing import List
OUTER_FENCE_REGEX = re.compile(
r"\A\s*(`{3,}|~{3,})[^\n]*\n(.*)\n\1\s*\Z", re.DOTALL
)
# YAML frontmatter: starts at file start with --- on its own line, ends with --- on its own line.
# Captures the entire block (including delimiters and trailing newline) and the body after.
FRONTMATTER_REGEX = re.compile(
r"\A(---\r?\n.*?\r?\n---\r?\n)(.*)", re.DOTALL
)
def split_frontmatter(text: str):
"""Split YAML frontmatter from body. Returns (frontmatter, body).
Memory files (and many other markdown docs) start with a YAML frontmatter
block delimited by `---` lines. The compression LLM has a habit of stripping
or rewriting these despite preserve-structure rules in the prompt — so we
surgically remove the frontmatter before compression and prepend it back
verbatim to the output. Files without frontmatter pass through unchanged.
"""
m = FRONTMATTER_REGEX.match(text)
if m:
return m.group(1), m.group(2)
return "", text
# Filenames and paths that almost certainly hold secrets or PII. Compressing
# them ships raw bytes to the Anthropic API — a third-party data boundary that
# developers on sensitive codebases cannot cross. detect.py already skips .env
# by extension, but credentials.md / secrets.txt / ~/.aws/credentials would
# slip through the natural-language filter. This is a hard refuse before read.
SENSITIVE_BASENAME_REGEX = re.compile(
r"(?ix)^("
r"\.env(\..+)?"
r"|\.netrc"
r"|credentials(\..+)?"
r"|secrets?(\..+)?"
r"|passwords?(\..+)?"
r"|id_(rsa|dsa|ecdsa|ed25519)(\.pub)?"
r"|authorized_keys"
r"|known_hosts"
r"|.*\.(pem|key|p12|pfx|crt|cer|jks|keystore|asc|gpg)"
r")$"
)
SENSITIVE_PATH_COMPONENTS = frozenset({".ssh", ".aws", ".gnupg", ".kube", ".docker"})
SENSITIVE_NAME_TOKENS = (
"secret", "credential", "password", "passwd",
"apikey", "accesskey", "token", "privatekey",
)
def backup_dir_for(filepath: Path) -> Path:
"""Resolve the out-of-tree backup directory for a given source file.
Backups must live OUTSIDE the source directory so skill auto-loaders
(Claude Code rules/, opencode instructions/, etc.) stop re-ingesting the
`.original.md` copies as live files. Base dir is platform-aware:
- Windows: %LOCALAPPDATA%\\caveman-compress\\backups
- else: $XDG_DATA_HOME/caveman-compress/backups if set,
else ~/.local/share/caveman-compress/backups
The source file's parent-dir name is mirrored under the base to reduce
cross-project collisions (e.g. two `task.md` files in different repos).
"""
if os.name == "nt" or sys.platform == "win32":
local_appdata = os.environ.get("LOCALAPPDATA")
base = Path(local_appdata) if local_appdata else Path.home() / "AppData" / "Local"
base = base / "caveman-compress" / "backups"
else:
xdg = os.environ.get("XDG_DATA_HOME")
base = Path(xdg) if xdg else Path.home() / ".local" / "share"
base = base / "caveman-compress" / "backups"
return base / filepath.parent.name
def is_sensitive_path(filepath: Path) -> bool:
"""Heuristic denylist for files that must never be shipped to a third-party API."""
name = filepath.name
if SENSITIVE_BASENAME_REGEX.match(name):
return True
lowered_parts = {p.lower() for p in filepath.parts}
if lowered_parts & SENSITIVE_PATH_COMPONENTS:
return True
# Normalize separators so "api-key" and "api_key" both match "apikey".
lower = re.sub(r"[_\-\s.]", "", name.lower())
return any(tok in lower for tok in SENSITIVE_NAME_TOKENS)
def strip_llm_wrapper(text: str) -> str:
"""Strip outer ```markdown ... ``` fence when it wraps the entire output."""
m = OUTER_FENCE_REGEX.match(text)
if m:
return m.group(2)
return text
def write_text_atomic(path: Path, text: str) -> None:
"""Write ``text`` to ``path`` atomically as UTF-8.
Path.write_text() truncates the destination before encoding the string —
a UnicodeEncodeError (or any other failure) partway through leaves a
0-byte file, destroying whatever was there before (issue #655). Encode
first, write the bytes to a sibling temp file, fsync, then os.replace()
so the destination only ever moves from one complete, valid file to
another. Preserves the original file's permission bits across the swap.
"""
data = text.encode("utf-8")
fd, tmp_name = tempfile.mkstemp(
dir=str(path.parent), prefix=path.name + ".", suffix=".tmp"
)
tmp_path = Path(tmp_name)
try:
with os.fdopen(fd, "wb") as f:
f.write(data)
f.flush()
os.fsync(f.fileno())
if path.exists():
os.chmod(tmp_path, stat.S_IMODE(path.stat().st_mode))
os.replace(tmp_path, path)
except Exception:
try:
tmp_path.unlink()
except OSError:
pass
raise
def first_nonblank_line(text: str) -> str:
"""Return the first non-blank line, stripped — used to detect a prose
preamble smuggled in ahead of the real content (issue #588)."""
for line in text.splitlines():
if line.strip():
return line.strip()
return ""
def _write_target(filepath: Path, text: str, backup_path: Path) -> None:
"""Write to the target file, surfacing the backup location if the write
itself fails. write_text_atomic already leaves the target untouched on
failure, but the caller still needs to know where the pre-compression
original lives instead of being left to guess (issue #652)."""
try:
write_text_atomic(filepath, text)
except Exception:
print(f"❌ Write to {filepath} failed. Original preserved at backup: {backup_path}")
raise
from .detect import should_compress
from .validate import validate
MAX_RETRIES = 2
# ---------- Claude Calls ----------
def call_claude(prompt: str) -> str:
"""Send a prompt to Claude.
Prefers the Anthropic SDK when ANTHROPIC_API_KEY is set; otherwise falls
back to the ``claude --print`` CLI (which handles desktop auth).
On Windows the CLI subprocess decoding defaults to the system codepage
(cp1251 / cp1252) and crashes on UTF-8 output — see issue #152. Pinning
``encoding="utf-8"`` with ``errors="replace"`` matches the CLI's actual
native I/O and prevents the UnicodeDecodeError before validation can
report. Windows users with non-ASCII content can also set
``ANTHROPIC_API_KEY`` to route through the SDK and skip the subprocess.
"""
api_key = os.environ.get("ANTHROPIC_API_KEY")
if api_key:
try:
import anthropic
client = anthropic.Anthropic(api_key=api_key)
msg = client.messages.create(
model=os.environ.get("CAVEMAN_MODEL", "claude-sonnet-4-5"),
max_tokens=8192,
messages=[{"role": "user", "content": prompt}],
)
return strip_llm_wrapper(msg.content[0].text.strip())
except ImportError:
pass # anthropic not installed, fall back to CLI
# Fallback: use claude CLI (handles desktop auth).
# Resolve binary via shutil.which so Windows .cmd/.bat shims (e.g.
# %APPDATA%\npm\claude.CMD) work without shell=True. On POSIX,
# shutil.which returns the same absolute path as the implicit lookup,
# so this is a no-op there. Falls back to bare "claude" if not found
# on PATH so subprocess raises a clear FileNotFoundError.
claude_bin = shutil.which("claude") or "claude"
try:
result = subprocess.run(
[claude_bin, "--print"],
input=prompt,
text=True,
capture_output=True,
check=True,
encoding="utf-8",
errors="replace",
)
return strip_llm_wrapper(result.stdout.strip())
except subprocess.CalledProcessError as e:
raise RuntimeError(f"Claude call failed:\n{e.stderr}")
def build_compress_prompt(original: str) -> str:
return f"""
Compress this markdown into caveman format.
STRICT RULES:
- Do NOT modify anything inside ``` code blocks
- Do NOT modify anything inside inline backticks
- Preserve ALL URLs exactly
- Preserve ALL headings exactly
- Preserve file paths and commands
- Return ONLY the compressed markdown body — do NOT wrap the entire output in a ```markdown fence or any other fence. Inner code blocks from the original stay as-is; do not add a new outer fence around the whole file.
Only compress natural language.
TEXT:
{original}
"""
def build_fix_prompt(original: str, compressed: str, errors: List[str]) -> str:
errors_str = "\n".join(f"- {e}" for e in errors)
return f"""You are fixing a caveman-compressed markdown file. Specific validation errors were found.
CRITICAL RULES:
- DO NOT recompress or rephrase the file
- ONLY fix the listed errors — leave everything else exactly as-is
- The ORIGINAL is provided as reference only (to restore missing content)
- Preserve caveman style in all untouched sections
ERRORS TO FIX:
{errors_str}
HOW TO FIX:
- Missing URL: find it in ORIGINAL, restore it exactly where it belongs in COMPRESSED
- Code block mismatch: find the exact code block in ORIGINAL, restore it in COMPRESSED
- Heading mismatch: restore the exact heading text from ORIGINAL into COMPRESSED
- Do not touch any section not mentioned in the errors
ORIGINAL (reference only):
{original}
COMPRESSED (fix this):
{compressed}
Return ONLY the fixed compressed file. No explanation.
"""
# ---------- Core Logic ----------
def compress_file(filepath: Path) -> bool:
# Resolve and validate path
filepath = filepath.resolve()
MAX_FILE_SIZE = 500_000 # 500KB
if not filepath.exists():
raise FileNotFoundError(f"File not found: {filepath}")
if filepath.stat().st_size > MAX_FILE_SIZE:
raise ValueError(f"File too large to compress safely (max 500KB): {filepath}")
# Refuse files that look like they contain secrets or PII. Compressing ships
# the raw bytes to the Anthropic API — a third-party boundary — so we fail
# loudly rather than silently exfiltrate credentials or keys. Override is
# intentional: the user must rename the file if the heuristic is wrong.
if is_sensitive_path(filepath):
raise ValueError(
f"Refusing to compress {filepath}: filename looks sensitive "
"(credentials, keys, secrets, or known private paths). "
"Compression sends file contents to the Anthropic API. "
"Rename the file if this is a false positive."
)
print(f"Processing: {filepath}")
if not should_compress(filepath):
print("Skipping (not natural language)")
return False
original_text = filepath.read_text(encoding="utf-8", errors="ignore")
# Store backup outside the source directory so skill auto-loaders don't
# re-ingest the `.original.md` copy as a live file. Mirror the source's
# parent-dir name + stem under a platform-aware base to reduce collisions.
backup_dir = backup_dir_for(filepath)
backup_path = backup_dir / (filepath.stem + ".original.md")
if not original_text.strip():
print("❌ Refusing to compress: file is empty or whitespace-only.")
return False
# Check if backup already exists to prevent accidental overwriting
if backup_path.exists():
print(f"⚠️ Backup file already exists: {backup_path}")
print("The original backup may contain important content.")
print("Aborting to prevent data loss. Please remove or rename the backup file if you want to proceed.")
return False
# Split YAML frontmatter off before compression. Claude tends to strip or
# rewrite frontmatter despite preserve-structure rules; we keep it verbatim
# by removing it from the input and re-prepending it to the output.
frontmatter, body = split_frontmatter(original_text)
if frontmatter:
print(f"Detected YAML frontmatter ({len(frontmatter)} chars) — preserving verbatim")
if not body.strip():
print("❌ Refusing to compress: body is empty after frontmatter removal.")
return False
# Step 1: Compress (body only, frontmatter excluded)
print("Compressing with Claude...")
compressed_body = call_claude(build_compress_prompt(body))
if compressed_body is None or not compressed_body.strip():
print("❌ Compression aborted: Claude returned an empty response.")
print(" Original file is untouched (no backup created).")
return False
# Compare the BODY (not the whole file) — frontmatter is preserved verbatim
# and would never change, so identity must be judged on the compressible part.
if compressed_body.strip() == body.strip():
print("❌ Compression aborted: output is identical to input.")
print(" Likely causes: Claude refused, returned the prompt verbatim, or the file is")
print(" already in caveman form. Original file is untouched (no backup created).")
return False
# Reassemble: frontmatter (verbatim) + compressed body
compressed = frontmatter + compressed_body
# Save original as backup, then verify the backup readback before
# touching the input file. If the filesystem dropped bytes (encoding,
# antivirus, disk full), unlink the bad backup and abort instead of
# leaving the user with a corrupt backup + compressed primary.
backup_dir.mkdir(parents=True, exist_ok=True)
write_text_atomic(backup_path, original_text)
backup_readback = backup_path.read_text(encoding="utf-8", errors="ignore")
if backup_readback != original_text:
print(f"❌ Backup write verification failed: {backup_path}")
print(" In-memory original differs from on-disk backup. Aborting before touching the input file.")
try:
backup_path.unlink()
except OSError:
pass
return False
_write_target(filepath, compressed, backup_path)
# Step 2: Validate + Retry
for attempt in range(MAX_RETRIES):
print(f"\nValidation attempt {attempt + 1}")
result = validate(backup_path, filepath)
if result.is_valid:
print("Validation passed")
break
print("❌ Validation failed:")
for err in result.errors:
print(f" - {err}")
if attempt == MAX_RETRIES - 1:
# Restore original on failure
_write_target(filepath, original_text, backup_path)
backup_path.unlink(missing_ok=True)
print("❌ Failed after retries — original restored")
return False
print("Fixing with Claude...")
compressed = call_claude(
build_fix_prompt(original_text, compressed, result.errors)
)
if compressed is None or not compressed.strip():
print("❌ Fix attempt aborted: Claude returned an empty response.")
print(" Skipping this attempt.")
continue
# Guard against a prose preamble smuggled in ahead of the real fixed
# content (issue #588). Only enforced when the original starts with a
# structural anchor (frontmatter `---` or a heading) — plain-prose
# first lines get legitimately rewritten by compression, and requiring
# them verbatim would reject every valid fix.
anchor = first_nonblank_line(original_text)
if anchor.startswith(("---", "#")) and first_nonblank_line(compressed) != anchor:
print("❌ Fix attempt aborted: output does not start with the original's first line.")
print(" Possible preamble leak. Skipping this attempt.")
continue
_write_target(filepath, compressed, backup_path)
return True

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#!/usr/bin/env python3
"""Detect whether a file is natural language (compressible) or code/config (skip)."""
import json
import re
from pathlib import Path
# Extensions that are natural language and compressible
COMPRESSIBLE_EXTENSIONS = {".md", ".txt", ".markdown", ".rst", ".typ", ".typst", ".tex"}
# Extensions that are code/config and should be skipped
SKIP_EXTENSIONS = {
".py", ".js", ".ts", ".tsx", ".jsx", ".json", ".yaml", ".yml",
".toml", ".env", ".lock", ".css", ".scss", ".html", ".xml",
".sql", ".sh", ".bash", ".zsh", ".go", ".rs", ".java", ".c",
".cpp", ".h", ".hpp", ".rb", ".php", ".swift", ".kt", ".lua",
".dockerfile", ".makefile", ".csv", ".ini", ".cfg",
}
# Well-known build/config files that carry no (or a misleading) extension —
# `Dockerfile` has no suffix so `.dockerfile` above never matches it, and
# `CMakeLists.txt` would ride the compressible `.txt` rule. Checked by
# basename before any extension rule.
KNOWN_CODE_FILENAMES = {
"dockerfile", "makefile", "gnumakefile", "jenkinsfile", "vagrantfile",
"rakefile", "gemfile", "justfile", "procfile", "brewfile",
"cmakelists.txt",
}
# Patterns that indicate a line is code
CODE_PATTERNS = [
re.compile(r"^\s*(import |from .+ import |require\(|const |let |var )"),
re.compile(r"^\s*(def |class |function |async function |export )"),
re.compile(r"^\s*(if\s*\(|for\s*\(|while\s*\(|switch\s*\(|try\s*\{)"),
re.compile(r"^\s*[\}\]\);]+\s*$"), # closing braces/brackets
re.compile(r"^\s*@\w+"), # decorators/annotations
re.compile(r'^\s*"[^"]+"\s*:\s*'), # JSON-like key-value
re.compile(r"^\s*\w+\s*=\s*[{\[\(\"']"), # assignment with literal
]
def _is_code_line(line: str) -> bool:
"""Check if a line looks like code."""
return any(p.match(line) for p in CODE_PATTERNS)
def _is_json_content(text: str) -> bool:
"""Check if content is valid JSON."""
try:
json.loads(text)
return True
except (json.JSONDecodeError, ValueError):
return False
def _is_yaml_content(lines: list[str]) -> bool:
"""Heuristic: check if content looks like YAML."""
yaml_indicators = 0
for line in lines[:30]:
stripped = line.strip()
if stripped.startswith("---"):
yaml_indicators += 1
elif re.match(r"^\w[\w\s]*:\s", stripped):
yaml_indicators += 1
elif stripped.startswith("- ") and ":" in stripped:
yaml_indicators += 1
# If most non-empty lines look like YAML
non_empty = sum(1 for l in lines[:30] if l.strip())
return non_empty > 0 and yaml_indicators / non_empty > 0.6
def detect_file_type(filepath: Path) -> str:
"""Classify a file as 'natural_language', 'code', 'config', or 'unknown'.
Returns:
One of: 'natural_language', 'code', 'config', 'unknown'
"""
ext = filepath.suffix.lower()
# Known code filenames win over any extension rule
if filepath.name.lower() in KNOWN_CODE_FILENAMES:
return "code"
# Extension-based classification
if ext in COMPRESSIBLE_EXTENSIONS:
return "natural_language"
if ext in SKIP_EXTENSIONS:
return "code" if ext not in {".json", ".yaml", ".yml", ".toml", ".ini", ".cfg", ".env"} else "config"
# Extensionless files (like CLAUDE.md, TODO) — check content
if not ext:
try:
text = filepath.read_text(encoding="utf-8", errors="ignore")
except (OSError, PermissionError):
return "unknown"
lines = text.splitlines()[:50]
# Shebang means executable script, never prose
if text.startswith("#!"):
return "code"
if _is_json_content(text[:10000]):
return "config"
if _is_yaml_content(lines):
return "config"
code_lines = sum(1 for l in lines if l.strip() and _is_code_line(l))
non_empty = sum(1 for l in lines if l.strip())
if non_empty > 0 and code_lines / non_empty > 0.4:
return "code"
return "natural_language"
return "unknown"
def should_compress(filepath: Path) -> bool:
"""Return True if the file is natural language and should be compressed."""
if not filepath.is_file():
return False
# Skip backup files
if filepath.name.endswith(".original.md"):
return False
return detect_file_type(filepath) == "natural_language"
if __name__ == "__main__":
import sys
if len(sys.argv) < 2:
print("Usage: python detect.py <file1> [file2] ...")
sys.exit(1)
for path_str in sys.argv[1:]:
p = Path(path_str).resolve()
file_type = detect_file_type(p)
compress = should_compress(p)
print(f" {p.name:30s} type={file_type:20s} compress={compress}")

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#!/usr/bin/env python3
import re
from collections import Counter
from pathlib import Path
URL_REGEX = re.compile(r"https?://[^\s)]+")
FENCE_OPEN_REGEX = re.compile(r"^(\s{0,3})(`{3,}|~{3,})(.*)$")
# A line that is nothing but a fence marker plus an optional info string, at ANY
# indentation. Used ONLY to scrub leaked markers before inline-code pairing (see
# extract_inline_codes) — never for block extraction.
#
# Widening FENCE_OPEN_REGEX itself to `\s*` looks like the obvious fix for #820
# and is a net regression: a lone indented ``` (the natural way to SHOW a fence
# inside prose) then opens a block that runs to EOF, swallowing real code blocks
# and silently removing their inline spans from validation. That turns a
# false-failure bug into a false-PASS bug, and a false PASS overwrites the
# user's file with unvalidated output.
FENCE_MARKER_LINE_REGEX = re.compile(r"^\s*(?:`{3,}|~{3,})[^`~]*$")
# Cap on how much of a lost/added span is echoed in an error message. Unpaired
# backticks can make a "span" hundreds of characters of prose; printing it whole
# is what made #820's failures undiagnosable.
MAX_REPORTED_SPAN = 60
HEADING_REGEX = re.compile(r"^(#{1,6})\s+(.*)", re.MULTILINE)
BULLET_REGEX = re.compile(r"^\s*[-*+]\s+", re.MULTILINE)
# crude but effective path detection
# Requires either a path prefix (./ ../ / or drive letter) or a slash/backslash within the match
PATH_REGEX = re.compile(r"(?:\./|\.\./|/|[A-Za-z]:\\)[\w\-/\\\.]+|[\w\-\.]+[/\\][\w\-/\\\.]+")
class ValidationResult:
def __init__(self):
self.is_valid = True
self.errors = []
self.warnings = []
def add_error(self, msg):
self.is_valid = False
self.errors.append(msg)
def add_warning(self, msg):
self.warnings.append(msg)
def read_file(path: Path) -> str:
return path.read_text(encoding="utf-8")
# ---------- Extractors ----------
def extract_headings(text):
return [(level, title.strip()) for level, title in HEADING_REGEX.findall(text)]
def extract_code_blocks(text):
"""Line-based fenced code block extractor.
Handles ``` and ~~~ fences with variable length (CommonMark: closing
fence must use same char and be at least as long as opening). Supports
nested fences (e.g. an outer 4-backtick block wrapping inner 3-backtick
content).
"""
blocks = []
lines = text.split("\n")
i = 0
n = len(lines)
while i < n:
m = FENCE_OPEN_REGEX.match(lines[i])
if not m:
i += 1
continue
fence_char = m.group(2)[0]
fence_len = len(m.group(2))
open_line = lines[i]
block_lines = [open_line]
i += 1
closed = False
while i < n:
close_m = FENCE_OPEN_REGEX.match(lines[i])
if (
close_m
and close_m.group(2)[0] == fence_char
and len(close_m.group(2)) >= fence_len
and close_m.group(3).strip() == ""
):
block_lines.append(lines[i])
closed = True
i += 1
break
block_lines.append(lines[i])
i += 1
if closed:
blocks.append("\n".join(block_lines))
# Unclosed fences are silently skipped — they indicate malformed markdown
# and including them would cause false-positive validation failures.
return blocks
def extract_urls(text):
return set(URL_REGEX.findall(text))
def extract_paths(text):
return set(PATH_REGEX.findall(text))
def count_bullets(text):
return len(BULLET_REGEX.findall(text))
def extract_inline_codes(text):
"""Backtick-delimited inline spans, with fenced code blocks stripped first.
Previously used a column-0-anchored regex to strip fences, which misses
fences indented 1-3 spaces (valid CommonMark). Reuse extract_code_blocks
(FENCE_OPEN_REGEX-based, indentation-aware) instead so an indented fence's
body backticks don't leak into inline-code pairing.
Any fence-marker line that survives that pass is then blanked (#820). A
fence indented 4+ spaces — what you get from showing an example inside a
bullet — is not matched by FENCE_OPEN_REGEX, so extract_code_blocks does
not remove it and its OWN backticks used to leak in and shift the pairing
of every following span, making the file permanently uncompressible.
Blanking just the marker lines fixes that without removing any prose, and
cannot run away the way a widened fence opener does.
The span pattern deliberately still spans newlines. CommonMark permits a
line ending inside a code span and hard-wrapped markdown produces them, so
a single-line pattern silently drops real spans — which downgrades a
deleted or mutated span from error to PASS. Long/garbled spans are a
presentation problem, handled by truncating in the error message instead.
"""
text_without_fences = text
for block in extract_code_blocks(text):
text_without_fences = text_without_fences.replace(block, "", 1)
text_without_fences = "\n".join(
"" if FENCE_MARKER_LINE_REGEX.match(line) else line
for line in text_without_fences.split("\n")
)
return re.findall(r"`([^`]+)`", text_without_fences)
# ---------- Validators ----------
def validate_headings(orig, comp, result):
h1 = extract_headings(orig)
h2 = extract_headings(comp)
if len(h1) != len(h2):
result.add_error(f"Heading count mismatch: {len(h1)} vs {len(h2)}")
if h1 != h2:
result.add_warning("Heading text/order changed")
def validate_code_blocks(orig, comp, result):
c1 = extract_code_blocks(orig)
c2 = extract_code_blocks(comp)
if c1 != c2:
result.add_error("Code blocks not preserved exactly")
def validate_urls(orig, comp, result):
u1 = extract_urls(orig)
u2 = extract_urls(comp)
if u1 != u2:
result.add_error(f"URL mismatch: lost={u1 - u2}, added={u2 - u1}")
def validate_paths(orig, comp, result):
p1 = extract_paths(orig)
p2 = extract_paths(comp)
if p1 != p2:
result.add_warning(f"Path mismatch: lost={p1 - p2}, added={p2 - p1}")
def validate_bullets(orig, comp, result):
b1 = count_bullets(orig)
b2 = count_bullets(comp)
if b1 == 0:
return
diff = abs(b1 - b2) / b1
if diff > 0.15:
result.add_warning(f"Bullet count changed too much: {b1} -> {b2}")
def validate_inline_codes(orig, comp, result):
def _render_spans(spans):
"""Render spans for an error message, truncated and newline-escaped.
A span may legitimately contain newlines, and an unpaired backtick can
make one hundreds of characters of prose. Printing those whole is what
made #820's failures undiagnosable — but the fix belongs here, in
presentation, not in what counts as a span.
"""
out = []
for span in sorted(spans):
flat = span.replace("\n", "\\n")
if len(flat) > MAX_REPORTED_SPAN:
flat = flat[:MAX_REPORTED_SPAN] + "…"
out.append(repr(flat))
return "{" + ", ".join(out) + "}"
c1 = Counter(extract_inline_codes(orig))
c2 = Counter(extract_inline_codes(comp))
if c1 != c2:
lost = set(c1.keys()) - set(c2.keys())
added = set(c2.keys()) - set(c1.keys())
for code, count in c1.items():
if code in c2 and c2[code] < count:
lost.add(f"{code} (lost {count - c2[code]} of {count} occurrences)")
if lost:
result.add_error(f"Inline code lost: {_render_spans(lost)}")
if added:
result.add_warning(f"Inline code added: {_render_spans(added)}")
# ---------- Main ----------
def validate(original_path: Path, compressed_path: Path) -> ValidationResult:
result = ValidationResult()
orig = read_file(original_path)
comp = read_file(compressed_path)
validate_headings(orig, comp, result)
validate_code_blocks(orig, comp, result)
validate_urls(orig, comp, result)
validate_paths(orig, comp, result)
validate_bullets(orig, comp, result)
validate_inline_codes(orig, comp, result)
return result
# ---------- CLI ----------
if __name__ == "__main__":
import sys
if len(sys.argv) != 3:
print("Usage: python validate.py <original> <compressed>")
sys.exit(1)
orig = Path(sys.argv[1]).resolve()
comp = Path(sys.argv[2]).resolve()
res = validate(orig, comp)
print(f"\nValid: {res.is_valid}")
if res.errors:
print("\nErrors:")
for e in res.errors:
print(f" - {e}")
if res.warnings:
print("\nWarnings:")
for w in res.warnings:
print(f" - {w}")