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The full API as tools: search, citation resolution, section text, point-in-time reconstruction.
Plugin
Primary Law for Claude
A plugin that gives Claude access to US primary law and teaches it how to read the results honestly: statutes, regulations, court rules, constitutions and agency guidance.
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What the plugin adds
Three layers: the MCP server carries the data, the skill carries the judgment, and the commands are the workflows people actually run.
A research skill
The part a tool schema cannot carry: which corpus to scope to, what a currency verdict means, how to report without overclaiming.
Ten commands
One per workflow that genuinely differs in shape, not one per corpus.
The commands
| Command | What it does |
|---|---|
/primary-law:research | Find the controlling law on a question and answer only from the text the tools return. |
/primary-law:verify-citations | Check every citation in a document against the official text; flag anything no longer good law. |
/primary-law:compare-states | How different states word the same rule, from one provision or a topic. |
/primary-law:as-of | A section as it stood on a past date, with provenance on how far the reconstruction can be trusted. |
/primary-law:authority | Trace a statute to the regulations that implement it, in either direction. |
/primary-law:rulemaking | Track a rulemaking: proposed, final, and when comments close. |
/primary-law:guidance | Federal agency guidance on a topic, and what weight it carries. |
/primary-law:adjudications | Federal administrative decisions, with the overruling caveat stated up front. |
/primary-law:changed | A one-off sweep of what moved in a corpus since a date. |
/primary-law:coverage | What is actually held for a jurisdiction, before reading an empty result as no law. |
Why the skill matters more than the tools
An API can hand a model the right text and still get a wrong answer out of it. These are the failure modes the skill is designed to prevent.
Identifiers come from the API, never from a citation
Hand-built section ids tend to 404, and the failure reads like missing coverage.
The body is not always the operative law
Notes and history can be a large share of a section body, so the skill fetches the split operative text.
Unverified is not the same as current
A result's currency verdict must be reported, not assumed.
An empty result is not an absence of law
Check coverage for the jurisdiction first.