How do I install the Pydantic Core Foundation skill?

Run npx skillmds@latest add ryan-brosas/pydantic-core-foundation in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Pydantic Core Foundation safe to use?

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Which AI agents work with Pydantic Core Foundation?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Pydantic Core Foundation free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Pydantic Core Foundation?

ryan-brosas (@ryan-brosas) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Pydantic Core Foundation by ryan-brosas

Name: Pydantic Core Foundation
Author: ryan-brosas

Pydantic Core Foundation

Use when porting schema-driven validation/serialization machinery, embedding pydantic-style validators in another runtime, or answering what pydantic-core guarantees about unions, recursion, defaults, error locations, and field serialization. Source code and direct tests are ground truth; references carry decisive excerpts and graph retrieval.

ryan-brosas Updated Sep 17, 2026

File contents

pydantic-core: validation & serialization engine foundation

Foundation contract

This is a cold, source-specific foundation, not an operational procedure. It is historical, revision-pinned evidence rather than timeless guidance. Current project source, tests, requirements, and runtime behavior outrank this projection and decide what ships.

Provenance and revision

Source record: pydantic-core; portable upstream identity, license, coverage caveats, and retrieval history are preserved in the index.
Recorded revision: main@383eb95a19433754c0cecf7025b50c26b6d97a36.
Full provenance, coverage caveats, boundaries, and preserved evidence: references/index.md.

Topic map

Representative topics: Build & dispatch; Public surface; Validation state; Union engines; Recursion & refs; Structured types; Defaults; Python hooks.
Scope and retrieval questions: references/index.md#use-this-for.
Complete capsule chooser: references/index.md#load-the-matching-source-dump.
Detailed grouped map: references/index.md#capsule-map.
Source limitations and portability boundaries: references/index.md#boundaries.

Retrieval

Open the index, choose one capsule matching the active question, and load only that capsule. Revalidate its cited source and revision before relying on it. Do not bulk-load the inventory, treat historical claims as current truth, or apply this foundation as a procedure.

Frequently asked questions