Sipcode

Sipcode

Keep Claude Code's context clean for sharper answers and lower cost, automatically.

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Install in 30 seconds

npm i -g sipcode
sipcode init

That is it. Your next Claude Code session will use Sipcode automatically. Verify a few minutes later:

sipcode drift

If the output reads no drift, context health stable, Sipcode is doing its job.

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What is Sipcode?

Sipcode is a free command-line tool that sits between you and Claude Code. It does three things:

1. It watches Claude Code's context window and warns you when it starts to bloat (we call this "context rot")
2. It catches duplicate file reads and other waste before they reach Claude, so you pay less for the same answers
3. It gives you receipts. Every saving is measurable in your terminal.

It is open source under the MIT license. It makes zero network calls during normal use. Your data never leaves your laptop.

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Why you probably want it

If you use Claude Code for real work, you have already felt this:

• Long sessions get expensive fast. A two-hour session on Claude Max can burn through your daily plan
• Quality drops as the context window fills. Claude starts re-reading files, repeating itself, losing the thread of what you asked
• You cannot tell what is bloat and what is signal

Sipcode measures the bloat, then removes the parts Claude does not need. The savings are not theoretical. Run sipcode benchmark on any machine and you will see the same 62.6% median reduction on the locked 20-task corpus.

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The two-minute tour

After installing, here are the five commands that show you what Sipcode is doing.

1. sipcode drift

Tells you if your current Claude Code session is drifting from your normal usage pattern. Bloated context, repeated reads, stale signals are all flagged here.

✓ Sipcode drift: no drift, context health stable vs your recent baseline.

2. sipcode proxy --stats

Shows what Sipcode caught in the current session, broken down by rewriter.

Sipcode proxy, rewrite stats
  total rewrites:    144
  est. tokens saved: ~288,685 (heuristic)
  signal kept:       67% (med), weighted across all rewrites

3. sipcode benchmark

Runs the locked 20-task corpus and produces a verifiable savings number. Anyone, anywhere can run this and get 62.6%.

62.6%  median savings on a locked 20-task corpus
       range 37.4% to 80.6%   3,567,170 tokens   $67.43

4. sipcode today

Daily spend summary. Tokens used, sessions, output ratio, comparison to your 30-day median.

spend so far    $1.20    across 4 sessions
tokens so far   943.8K   output ratio 3.7%

5. sipcode forecast

Month-end projection based on your last 14 days.

projected month-end   $17,674   (range $14,139 to $21,208)

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How to install (more detail)

Sipcode works on Mac, Linux, and Windows. You need Node.js 18 or newer.

Step 1. Install Node.js

Skip this step if you already have Node.js. Otherwise:

• Mac: brew install node
• Linux (Ubuntu / Debian): sudo apt install nodejs npm
• Windows: Download from nodejs.org

Verify it worked:

node --version

You should see v18.0.0 or higher.

Step 2. Install Sipcode globally

npm i -g sipcode

This downloads Sipcode from npm and makes the sipcode command available everywhere.

If you see permission errors on Mac or Linux, try:

sudo npm i -g sipcode

Verify it installed:

sipcode --version

You should see 1.6.15 or higher.

Step 3. Run sipcode init to wire it into Claude Code

sipcode init

This command does four things: