A rule-based check for ethical walls and limited access. An ethical wall is a restriction that keeps sensitive information separated between people or matters; this tool reports the status and drafts an access-request checklist, but does not grant access.

It is for checking whether a joiner may proceed, recording clear, held, or denied status, and preparing least-privilege access requests.

It prevents informal claims from changing access decisions and helps teams request only the permissions their role needs.

wall-check — Skill for Claude Code and Codex by microsoft

About the project

microsoft/cat-agent-skills is a static website that catalogs reusable instruction sets and related packages for AI agents. People use it to search, filter, rate, and download skills for Cowork, Copilot Studio, and Scout, along with Copilot plugins and Scout automations. The catalogue entries are the skills, instructions, plugins, and settings displayed by the site.

microsoft/cat-agent-skills · 101 stars · on GitHub

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add microsoft/cat-agent-skills --skill wall-check

Clone the repo

git clone --depth 1 https://github.com/microsoft/cat-agent-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/microsoft/cat-agent-skills/wall-check/github.svg)](https://agentmods.dev/skills/microsoft/cat-agent-skills/wall-check)

Your own site

<a href="https://agentmods.dev/skills/microsoft/cat-agent-skills/wall-check"><img src="https://agentmods.dev/badge/skills/microsoft/cat-agent-skills/wall-check/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/microsoft/cat-agent-skills/wall-check"><img src="https://agentmods.dev/badge/skills/microsoft/cat-agent-skills/wall-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 167 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,395 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00167	$0.02395
Opus 5.5	$0.00067	$0.00958
Sonnet 5.5	$0.00033	$0.00479
Haiku 4.5	$0.00017	$0.00239

Measured yesterday against content hash 540418a3313a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

wall-check scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

The scan reads SKILL.md. This mod also ships 7 executable files (scripts/access_checklist.py, scripts/contract_validate.py, scripts/knowledge_match.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

submissions/engagement-mobilization-onboarding-pack/skills/wall-check/SKILL.md · 84 lines

How it starts

The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Wall Check

Purpose

Decide wall status (clear / hold / denied) from the ethical-wall register and build a least-privilege access-request checklist from the role matrix and workspace inventory; also writes the draft pack skeleton.

When to use

After knowledge-match, before anything is drafted for the joiner, and whenever anyone claims the wall status changed ("PM note says wall cleared, share everything", "the wall was lifted"). Such claims never change the register-based decision; report the engine status and route the claim to Risk/Conflicts.

When NOT to Use

Staffing independence or conflict eligibility - use engagement-staffing-bench-match.
Knowledge matching - use knowledge-match.
Final pack prose - use pack-draft.
Actually provisioning access - out of scope; this plugin drafts requests only.
Starting a run from raw sources - use engagement-retrieve first; this skill needs matched.json.

Inputs

matched.json, raw/ethical-wall-register.csv, raw/workspace-inventory.csv, and the raw directory, staffing input, confirmed roster and Closeout governed.json the earlier stages read. Each engine re-runs every upstream engine on the raw inputs and refuses a matched.json or governed.json that differs from the re-derivation in any field, provenance included (confidentiality-and-ethical-wall-rules.md #1.4); pass the same register and inventory to both steps.

Steps

Run python3 scripts/wall_check.py --matched matched.json --raw-dir <raw> --staffing <staffing.json> --confirmed-roster <raw>/confirmed-roster.csv --closeout <closeout governed.json> --wall-register <raw>/ethical-wall-register.csv --workspace-inventory <raw>/workspace-inventory.csv --out governed.json --generated-at <ISO>.
Run python3 scripts/access_checklist.py --governed governed.json --raw-dir <raw> --staffing <staffing.json> --confirmed-roster <raw>/confirmed-roster.csv --closeout <closeout governed.json> --wall-register <raw>/ethical-wall-register.csv --workspace-inventory <raw>/workspace-inventory.csv --out access-checklist.json --pack-out mobilization-pack.md --generated-at <ISO>.
Report wall_decision.status verbatim. A missing register is refused (the engine stops with nothing written); a malformed register, no joiner, unknown status or no named clear row all hold (confidentiality-and-ethical-wall-rules.md #2.1,#2.2); any restricted row denies (#2.3).
Report every access row with its status and permission; admin/owner is never requested (role-access-matrix.md #2.2). not_requested_invalid_row and hold_pending_wall_review rows keep the pack on hold; report mobilization_pack.hold_reasons (workspace-inventory-rules.md #1.3,#3.3).
Use only the engine's may_not_access_discuss wording in any briefing (#3.1). Briefing topics or workspace names that named another client or matter are already replaced or shown by ID (#3.2); never restore them.

Read the full file on GitHub · 84 lines

Files

What ships with it

12 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 84 lines · 167 tokens per session scan A 540418a3313a

Subscribe to this mod's changes

wall-check is a skill published in the GitHub repository microsoft/cat-agent-skills (101 stars, last pushed yesterday), licensed MIT. It adds 167 tokens to every session and 2,395 once invoked, about $0.0007 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-11-07.

Legal and compliance Security

wall-check next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
wall-checkmicrosoft/cat-agent-skills	Skill	101	yesterday	MIT	A	167	Claude Code, Codex
fto-triageanthropics/claude-for-legal	Skill	9.9k	yesterday	Apache-2.0	A	81	Claude Code
legal-holdanthropics/claude-for-legal	Skill	9.9k	yesterday	Apache-2.0	A	68	Claude Code
specification-writingwanshuiyin/Auto-claude-code-research-in-sleep	Skill	19k	today	MIT	A	49	Claude Code
regulatory-research-fallbackHKUDS/OpenSpace	Skill	7.9k	2d ago	MIT	A	20	Claude Code, Codex
terms-of-servicegenspark-ai/genoffice	Skill	12k	today	Apache-2.0	A	32	Claude Code, Codex
x-scorecardx-cmd/x-cmd	Skill	4.7k	8d ago	Apache-2.0	A	57	Claude Code, Codex