Pith Number

pith:3QI3EWHK

pith:2026:3QI3EWHKUDXZ6LTQFHWDYEXUP3

not attested not anchored not stored refs pending

LegalCheck: Retrieval- and Context-Augmented Generation for Drafting Municipal Legal Advice Letters

Julien Rossi, Virgill van der Meer

A retrieval- and context-augmented system generates near-final municipal legal advice letters in minutes rather than hours.

arxiv:2605.12012 v2 · 2026-05-12 · cs.AI

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\usepackage{pith}
\pithnumber{3QI3EWHKUDXZ6LTQFHWDYEXUP3}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

In a real-world deployment within the Municipality of Amsterdam, LegalCheck produced near-final advice letters in minutes rather than hours, while maintaining high legal consistency and factual accuracy. The output captured the vast majority of required legal reasoning (often 80% to 100% of essential content).

C2weakest assumption

That expert-in-the-loop review combined with retrieval from curated legal knowledge bases is sufficient to prevent legally significant errors or omissions in the generated drafts.

C3one line summary

LegalCheck applies RAG and CAG to generate draft legal advice letters from laws and precedents, achieving 80-100% coverage of essential reasoning in minutes during a municipal deployment.

Receipt and verification

First computed	2026-05-20T00:05:47.266600Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

dc11b258eaa0ef9f2e7029ec3c12f47efb469e4aa00f9ec42db622b48c19d390

Aliases

arxiv: 2605.12012 · arxiv_version: 2605.12012v2 · doi: 10.48550/arxiv.2605.12012 · pith_short_12: 3QI3EWHKUDXZ · pith_short_16: 3QI3EWHKUDXZ6LTQ · pith_short_8: 3QI3EWHK

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/3QI3EWHKUDXZ6LTQFHWDYEXUP3 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: dc11b258eaa0ef9f2e7029ec3c12f47efb469e4aa00f9ec42db622b48c19d390

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "027e2d6626741be525309f4138b2c9902e80526d2b55318c8b4dc4fb18208550",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "primary_cat": "cs.AI",
    "submitted_at": "2026-05-12T12:01:29Z",
    "title_canon_sha256": "658e08b895f0db8230c04692da67f4fe89164ff7ec4652b24f3ffaba8e3b1bd3"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.12012",
    "kind": "arxiv",
    "version": 2
  }
}