A Skill is a reusable bundle of instructions for a specific task — querying a database, triaging an alert, generating a report. At its core a skill is aDocumentation Index
Fetch the complete documentation index at: https://www.truefoundry.com/llms.txt
Use this file to discover all available pages before exploring further.
SKILL.md file: YAML frontmatter (name + description) plus a Markdown body describing the procedure. Skills can also ship supporting files like references/, scripts/, and assets/.
The Skills Registry is where every Skill in your organization is registered, versioned, and discovered. Skills are stored as artifact versions inside a Repository, just like Prompts and Models — so they inherit the same access control, versioning, and audit guarantees.

How a Skill is Structured
A skill is a directory rooted atSKILL.md. The frontmatter declares the skill’s identity; the Markdown body is the procedure.
SKILL.md
SKILL.md:
Frontmatter Rules
Bothname and description are required.
| Field | Rules |
|---|---|
name | 1–64 characters. Lowercase letters, digits, and hyphens only. Cannot start or end with a hyphen. Cannot contain anthropic or claude. Must match the skill name on the manifest. |
description | 1–1024 characters. Short, action-oriented — this is the only text the agent sees about the skill upfront. |
Skill names are unique per Repository. When mounting skills into a single
agent run, skill names must also be unique within the request.