common-law-contract-formation-consideration

common-law-contract-formation-consideration is a skill for Claude Code, Codex from ThomasMoreAI/legal-skills-open. It costs 128 tokens per session (1,398 once invoked), scanned A, original, Apache-2.0.

A guide to how contracts are formed under Common Law, including offers, acceptance, consideration, deeds, and promissory estoppel. Consideration is the value or commitment usually exchanged for a promise; a deed is a formal promise that can follow different rules.

In plain words
What is it for?
Use it to review or explain transaction agreements, non-disclosure agreements, and other contracts involving UK or US parties.
Why use it?
It prevents German contract concepts from being applied automatically to UK or US agreements. It also separates jurisdiction-specific rules and checks risks such as missing consideration or deed requirements.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to review or explain transaction agreements, non-disclosure agreements, and other contracts involving UK or US parties.

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Install with agentmods
npx agentmods add skills/thomasmoreai/legal-skills-open/common-law-contract-formation-consideration
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 common-law-contract-formation-consideration
Clone the repo
git clone --depth 1 https://github.com/ThomasMoreAI/legal-skills-open

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.

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README.md
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Per session 128 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,398 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 $0.00128 $0.01398
Opus 5 $0.00064 $0.00699
Sonnet 5 $0.00026 $0.00280
Haiku 4.5 $0.00013 $0.00140

Measured 9d ago against content hash 1db12ae0eb56, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

common-law-contract-formation-consideration 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.

cross-jurisdiction/contracts/skills/common-law-contract-formation-consideration/SKILL.md · 110 lines

How it starts

The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Contract Formation und Consideration

Zweck

Contract formation wird nicht mit deutschem Willenserklärungs- und Synallagma-Autopiloten verwechselt.

Wann verwenden

  • bei Verträgen, Memos, Redlines, Übersetzungen oder Schulungen mit Common-Law-Bezug
  • wenn deutsche Rechtsbegriffe ins Englische übertragen werden
  • wenn UK/US-Unterschiede oder False Friends drohen

Arbeitsweise

  1. Jurisdiktion fixieren. Rechtswahl, verbindliche Sprache, UK/US-Spur, Bundesstaat und Vertragstyp klären.
  2. Begriff funktional prüfen. Nicht übersetzen, bevor Rechtsfolge, Parteirolle, Klauselzweck und Risiko feststehen.
  3. False Friends markieren. Treffer mit Fundstelle, Risiko, besserer Formulierung und Review-Level ausgeben.
  4. Ton steuern. Low-key erklären, aber bei Haftung, Streit und Mandatsgeheimnis nüchtern bleiben.
  5. Qualitätstor setzen. Quellenstand, offene Annahmen, Local-Counsel-Bedarf und nächste Schritte dokumentieren.

Rückfragen, wenn unklar

  • Welche Rechtsordnung, Quelle oder verbindliche Fassung ist maßgeblich?
  • Welche Partei oder Rolle vertreten wir?
  • Soll mit echten, geschwärzten oder simulierten Daten gearbeitet werden?
  • Welches Arbeitsprodukt wird gebraucht und wie eilig ist es?

Ausgabeformat

  • Kurzlage mit Ampel
  • Prüfmatrix mit Fundstelle, Risiko, Vorschlag und Review-Level
  • anwaltlich prüfbarer Entwurf oder Mandantenhinweis
  • offene Annahmen, Quellenstand und nächste Schritte

Typische Fehler vermeiden

  • Bürgschaft, guarantee, suretyship und indemnity nicht gleichsetzen.
  • Consideration nicht als deutsche Gegenleistung behandeln.
  • UK, USA, New York, Delaware und UCC nicht vermischen.
  • Keine erfundenen Fälle oder Quellen verwenden.

Ton

Common-Law-Kompass arbeitet freundlich, präzise und verzeihend. Der Stil darf leicht sein, aber nie auf Kosten der juristischen Trennschärfe.

Triage

Before proceeding, clarify:

  1. Which jurisdiction — England/Wales, New York, Delaware, other US state, or multi-jurisdictional?
  2. Is this a simple contract, deed, or a contract under UCC (goods)?
  3. Is there a consideration issue — adequacy vs. sufficiency; past consideration?
  4. Promissory estoppel raised — US or UK variant?

Read the full file on GitHub · 110 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 · 110 lines · 128 tokens per session scan A 1db12ae0eb56

Subscribe to this mod's changes

common-law-contract-formation-consideration is a skill published in the GitHub repository ThomasMoreAI/legal-skills-open (72 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 128 tokens to every session and 1,398 once invoked, about $0.0006 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 2026-09-03.