What is matter-workspace?

A workspace manager that keeps information for one client or legal matter separate from other matters. It can create, list, switch, close, or detach matter workspaces.

Use it to start a matter, change the active matter, list open matters, archive a matter, or work without a selected matter.

It reduces the risk of mixing one client's context, files, or instructions with another client's work.

matter-workspace — Skill for Claude Code by ThomasMoreAI

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 ThomasMoreAI/legal-skills-open --skill matter-workspace

Clone the repo

git clone --depth 1 https://github.com/ThomasMoreAI/legal-skills-open

Made for: Claude Code.

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/thomasmoreai/legal-skills-open/matter-workspace/github.svg)](https://agentmods.dev/skills/thomasmoreai/legal-skills-open/matter-workspace)

Your own site

<a href="https://agentmods.dev/skills/thomasmoreai/legal-skills-open/matter-workspace"><img src="https://agentmods.dev/badge/skills/thomasmoreai/legal-skills-open/matter-workspace/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/thomasmoreai/legal-skills-open/matter-workspace"><img src="https://agentmods.dev/badge/skills/thomasmoreai/legal-skills-open/matter-workspace.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 79 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,471 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 86% copy Near-identical to another mod 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	$0.00079	$0.02471
Opus 5.5	$0.00032	$0.00988
Sonnet 5.5	$0.00016	$0.00494
Haiku 4.5	$0.00008	$0.00247

Measured 24d ago against content hash f51904ba1e97, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

matter-workspace 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 24d ago.

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.

Origin

This is a copy

86% identical to matter-workspace — 45 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

br/corporate/skills/matter-workspace/SKILL.md · 189 lines

How it starts

The opening of the file, as written. The whole thing — 189 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/matter-workspace

Practitioners work across multiple clients and matters. A matter workspace keeps one client or engagement's context separate from every other. This skill manages those workspaces.

Subcommands

/corporate-legal:matter-workspace new <slug> — create a new matter workspace, run a short intake, write matter.md
/corporate-legal:matter-workspace list — list matters with status and active flag
/corporate-legal:matter-workspace switch <slug> — set the active matter
/corporate-legal:matter-workspace close <slug> — archive a matter (move to ~/.claude/plugins/config/claude-for-legal/corporate-legal/matters/_archived/, never delete)
/corporate-legal:matter-workspace none — detach from any active matter, work at practice-level only

Instructions

Read ~/.claude/plugins/config/claude-for-legal/corporate-legal/CLAUDE.md — confirm the ## Matter workspaces section is populated. If Enabled is ✗, tell the user: "Matter workspaces are off — you're configured as an in-house practice with one client, so the plugin works from practice-level context automatically. If you actually work across multiple clients, re-run /corporate-legal:cold-start-interview --redo and select a private-practice setting. Otherwise, you don't need /matter-workspace at all." Don't error — the disabled state is the expected one for in-house users.
Use the workflow below.
Dispatch on the first token of $ARGUMENTS:
- new → run the intake interview, write ~/.claude/plugins/config/claude-for-legal/corporate-legal/matters/<slug>/matter.md, seed history.md and notes.md.
- list → enumerate ~/.claude/plugins/config/claude-for-legal/corporate-legal/matters/*/matter.md, print a table, mark the active matter.
- switch → update the Active matter: line in the practice-level CLAUDE.md.
- close → move ~/.claude/plugins/config/claude-for-legal/corporate-legal/matters/<slug>/ to ~/.claude/plugins/config/claude-for-legal/corporate-legal/matters/_archived/<slug>/, log the close date in history.md.
- none → set Active matter: to none — practice-level context only.
Show the user what changed and confirm before writing.

Read the full file on GitHub · 189 lines

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.

24d ago First seen · 189 lines · 79 tokens per session scan A f51904ba1e97

Subscribe to this mod's changes

matter-workspace is a skill published in the GitHub repository ThomasMoreAI/legal-skills-open (95 stars, last pushed 15d ago), licensed Apache-2.0. It adds 79 tokens to every session and 2,471 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 86% identical to matter-workspace, differing in 45 lines, and is treated as a copy.

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