context-tax-audit SKILL.md skillA
context-tax-audit from minimax-ai/mcode-stack is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add minimax-ai/mcode-stack/context-tax-audit@git:20261029.49a3ff4Pins git:20261029.49a3ff4 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- minimax-ai/mcode-stack
- Path
stacks/ronny/skills/context-tax-audit/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261029.49a3ff4, committed Oct 29, 2026
- First version recorded
- Oct 28, 2026
- Size
- 3,714 bytes
- Repository stars
- 495
- License
- MIT
Inventory everything an agent injects into each request besides the user's message, such as system prompt, environment info, skill list, tool definitions, per-turn context blocks and reminders, and check necessity, frequency, precision, position and prompt-cache impact. Use when reviewing an agent's prompt assembly, chasing low cache hit rates, or trimming per-turn overhead.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Context Tax Audit Every request carries more than the user's sentence: system prompt, environment info, the skill list, tool definitions, per-turn context blocks, reminders. Most of it is worth paying for. The audit finds what is not, and what is placed so that it breaks the prompt cache. Companion to MCode Engineering Notes 05 (how the agent learns the current time — and why stuffing `date` into the system prompt breaks the prefix cache). Plain-text checklist: `checklists/context-tax.md`. ## 1. Inventory one real request Capture an actual request the agent sends (debug log, proxy, or the code that assembles it). List every part except the user's message: | Part | Where it sits | How often it changes | Tokens | | --- | --- | --- | --- | Count tokens with a tokenizer and name it; treat the counts as relative. Do a fresh-session first request and a later turn, since they often differ. ## 2. Necessity - what breaks if you delete it? For each part, write one sentence: "without this, the model would ...". Typical answers: without environment info it guesses the OS and shell; without the current time it assumes its training year; without a time budget it does …
Read the whole file at its exact version.
How to install
mdr add minimax-ai/mcode-stack/context-tax-audit@sha256:afd253b0ba4b1328The line at the top of this page pins the label git:20261029.49a3ff4, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_4xrv26pb75rsyon3)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Oct 28, 2026 and Oct 29, 2026, about one every 2 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261029.49a3ff4 latest | 2026-10-29 | 49a3ff4 | 3,714 B | A | view · diff |
| git:20261028.c889a19 | 2026-10-28 | c889a19 | 3,636 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3714 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
minimax-ai/mcode-stack · 495 stars · license MIT · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4xrv26pb75rsyon3 GET https://markdownregistry.com/api/v1/resolve?ref=minimax-ai/mcode-stack/context-tax-audit GET https://markdownregistry.com/api/v1/blob/afd253b0ba4b132826388d2c6c55c3de52693d05e21a961e1cd8fe918c58b53a
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.