What is matter-workspace?

A workspace manager for keeping files and context for separate legal clients or engagements apart. A matter means one specific client case or business engagement.

Use it to create, list, switch, close, or detach matter workspaces, with closed matters archived instead of deleted.

It reduces the risk of mixing information between clients while working across multiple legal matters.

matter-workspace — Skill for Claude Code by uk-agents/uk-legal-plugins

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 uk-agents/uk-legal-plugins --skill matter-workspace

Clone the repo

git clone --depth 1 https://github.com/uk-agents/uk-legal-plugins

Made for: Claude Code.

Or install ai-governance-legal-uk, the plugin that ships this one along with the rest of its 10 skills, 5 MCP servers.

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/uk-agents/uk-legal-plugins/matter-workspace/github.svg)](https://agentmods.dev/skills/uk-agents/uk-legal-plugins/matter-workspace)

Your own site

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

Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,292 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	$0.00082	$0.02292
Opus 5.5	$0.00033	$0.00917
Sonnet 5.5	$0.00016	$0.00458
Haiku 4.5	$0.00008	$0.00229

Measured 1mo ago against content hash 07e99491e302, 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 1mo 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.

ai-governance-legal-uk/skills/matter-workspace/SKILL.md · 184 lines

How it starts

The opening of the file, as written. The whole thing — 184 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

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

Instructions

Read ~/.claude/plugins/config/uk-legal-plugins/ai-governance-legal-uk/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 /ai-governance-legal-uk: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/uk-legal-plugins/ai-governance-legal-uk/matters/<slug>/matter.md, seed history.md and notes.md.
- list → enumerate ~/.claude/plugins/config/uk-legal-plugins/ai-governance-legal-uk/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/uk-legal-plugins/ai-governance-legal-uk/matters/<slug>/ to ~/.claude/plugins/config/uk-legal-plugins/ai-governance-legal-uk/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 · 184 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.

1mo ago First seen · 184 lines · 82 tokens per session scan A 07e99491e302

Subscribe to this mod's changes

matter-workspace is a skill published in the GitHub repository uk-agents/uk-legal-plugins (14 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 82 tokens to every session and 2,292 once invoked, about $0.0003 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 2026-08-31.

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