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[Python] [Breaking] Extract skill spec metadata into SkillFrontmatter #5775

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Merged
SergeyMenshykh merged 4 commits into from
May 13, 2026
Merged

[Python] [Breaking] Extract skill spec metadata into SkillFrontmatter #5775

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c17dd6f
Fix Skill docstring consistency and spelling
SergeyMenshykh May 11, 2026
3c616ce
Fix E501 line-too-long lint error in test_skills.py
SergeyMenshykh May 12, 2026
88b2262
Fix stale test section header to reflect SkillFrontmatter API
SergeyMenshykh May 12, 2026
aa3e9ad
Fix metadata children overriding top-level frontmatter fields
SergeyMenshykh May 12, 2026
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3 changes: 2 additions & 1 deletion python/packages/core/AGENTS.md
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Expand Up @@ -69,7 +69,8 @@ agent_framework/

### Skills (`_skills.py`)

- **`Skill`** - A skill definition bundling instructions (`content`) with metadata, resources, and scripts. Supports `@skill.resource` and `@skill.script` decorators for adding components.
- **`Skill`** - Abstract base for a skill definition bundling instructions (`content`) with frontmatter metadata, resources, and scripts. Concrete subclasses (`InlineSkill`, `FileSkill`, `ClassSkill`) accept a `frontmatter=SkillFrontmatter(...)` argument carrying the spec fields. Adding new spec fields is done in one place — on `SkillFrontmatter` — keeping the subclass constructors stable.
- **`SkillFrontmatter`** - L1 discovery metadata for a skill (`name`, `description`, `license`, `compatibility`, `allowed_tools`, `metadata`). All fields are mutable plain attributes; the constructor validates `name`, `description`, and `compatibility` against the spec but post-construction assignments are not re-validated. Spec fields are reachable on every skill via `skill.frontmatter`.
- **`SkillResource`** - Named supplementary content attached to a skill; holds either static `content` or a dynamic `function` (sync or async). Exactly one must be provided.
- **`SkillScript`** - An executable script attached to a skill; holds either an inline `function` (code-defined, runs in-process) or a `path` to a file on disk (file-based, delegated to a runner). Exactly one must be provided.
- **`SkillScriptRunner`** - Protocol for file-based script execution. Any callable matching `(skill, script, args) -> Any` satisfies it. Code-defined scripts do not use a runner.
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2 changes: 2 additions & 0 deletions python/packages/core/agent_framework/__init__.py
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Expand Up @@ -147,6 +147,7 @@
InlineSkillScript,
InMemorySkillsSource,
Skill,
SkillFrontmatter,
SkillResource,
SkillScript,
SkillScriptRunner,
Expand Down Expand Up @@ -432,6 +433,7 @@
"SessionContext",
"SingleEdgeGroup",
"Skill",
"SkillFrontmatter",
"SkillResource",
"SkillScript",
"SkillScriptRunner",
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