folio

folio is a skill for Claude Code from alea-institute/folio-claude-plugin. It costs 86 tokens per session (966 once invoked), scanned A, original, MIT.

A search and browsing tool for FOLIO, an open legal ontology—a structured list of legal concepts and their relationships. It covers law areas, document types, legal entities, and related terms.

In plain words
What is it for?
Use it to classify legal concepts, identify document and entity types, find areas of law, explore relationships, and export formal definitions.
Why use it?
It helps you use consistent legal classifications instead of guessing labels or searching through disconnected references.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the folio plugin — 4 skills, 1 MCP server shipped together

Good fit Use it to classify legal concepts, identify document and entity types, find areas of law, explore relationships, and export formal definitions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/alea-institute/folio-claude-plugin/folio
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 alea-institute/folio-claude-plugin --skill folio
Clone the repo
git clone --depth 1 https://github.com/alea-institute/folio-claude-plugin

Made for: Claude Code.

Or install folio, the plugin that ships this one along with the rest of its 4 skills, 1 MCP server.

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.

agentmods badge for folio

README.md
[![agentmods](https://agentmods.dev/badge/skills/alea-institute/folio-claude-plugin/folio/github.svg)](https://agentmods.dev/skills/alea-institute/folio-claude-plugin/folio)
Your own site
<a href="https://agentmods.dev/skills/alea-institute/folio-claude-plugin/folio"><img src="https://agentmods.dev/badge/skills/alea-institute/folio-claude-plugin/folio/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.

agentmods 80×15 button for folio

Your own site · 80×15
<a href="https://agentmods.dev/skills/alea-institute/folio-claude-plugin/folio"><img src="https://agentmods.dev/badge/skills/alea-institute/folio-claude-plugin/folio.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 86 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 966 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00086 $0.00966
Opus 5 $0.00043 $0.00483
Sonnet 5 $0.00017 $0.00193
Haiku 4.5 $0.00009 $0.00097

Measured 9d ago against content hash 542ee49ede8f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

folio 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 9d 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.

skills/folio/SKILL.md · 88 lines

How it starts

The opening of the file, as written. The whole thing — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.

When to Use

Use the FOLIO MCP tools when you need to:

  • Classify legal concepts: Find the correct ontology term for a legal concept
  • Identify document types: Look up legal document classifications (contracts, filings, opinions)
  • Find areas of law: Determine which legal practice area applies
  • Map entity types: Identify types of legal entities (corporations, trusts, partnerships)
  • Explore relationships: Find how legal concepts relate to each other
  • Export definitions: Get formal definitions in markdown, JSON-LD, or OWL XML

Follow this workflow:

  1. Search by name: Start with folio:search_concepts(query) to find concepts by label
  2. Refine by definition: If name search is too broad, use folio:search_definitions(query)
  3. Advanced query: Use folio:query_concepts(label, definition, branch, parent) for composable filters
  4. Query properties: Use folio:query_properties(label, definition, domain, range) to find relationships
  5. Browse branches: Use folio:list_branches() then folio:get_taxonomy_branch(branch_name) to explore a category
  6. Navigate hierarchy: Use folio:get_children(iri) and folio:get_parents(iri) to explore up/down the taxonomy

Classification Workflows

Three specialized classification workflows are available as slash commands. Suggest these to users when they need structured FOLIO classification:

Slash Command Use When Key Branches
/folio:classify-document Classifying a legal document type document_artifacts
/folio:identify-area-of-law Identifying areas of law for a situation areas_of_law
/folio:classify-entity Classifying a legal entity, role, or org actors_players, legal_entities

Each workflow searches, browses the relevant taxonomy branch, navigates to the best match, and returns: FOLIO Label, IRI, Definition, Confidence, and Reasoning.

Branch Reference

Branch Key Description
actors_players Parties, roles, participants
areas_of_law Practice areas, specializations
asset_types Property, IP, financial assets
communication_modalities Communication channels
currencies Monetary currencies
data_formats Data and file formats
document_artifacts Legal documents, contracts
engagement_terms Fee arrangements, engagement terms
events Legal events, milestones
forum_venues Courts, tribunals, venues
governmental_bodies Government agencies
industries Industry sectors
languages Natural languages
folio_types Internal FOLIO types
legal_authorities Statutes, regulations, case law
legal_entities Corporations, LLCs, trusts
locations Geographic locations
matter_narratives Matter descriptions
matter_narrative_formats Narrative formats
objectives Legal objectives
services Legal services
standards_compatibilities Standards mappings
statuses Status values
system_identifiers External identifiers

Read the full file on GitHub · 88 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.

  1. 9d ago First seen · 88 lines · 0 tokens per session scan A 542ee49ede8f

Subscribe to this mod's changes

folio is a skill published in the GitHub repository alea-institute/folio-claude-plugin (2 stars, last pushed 5mo ago), licensed MIT. It adds 86 tokens to every session and 966 once invoked, about $0.0004 per session on Opus 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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