sausage/extensions/prompt

System context

The prompt extension supplies project_context, skills, tools, and cwd sections. The effective environment cwd takes precedence over the configured agent cwd. Project instructions include each AGENTS.md from the repository root to that cwd, in that order. Outside a repository, the extension reads the cwd's AGENTS.md only.

Skills come from /src/sausage/skills/*/SKILL.md and <repo>/.sausage/skills/*/SKILL.md. The prompt lists each skill's name, description, and path. A project skill replaces a built-in skill with the same name. The tools section lists the tools that the resolved agent can use. No Ultimate build note enters the prompt.

host/tests/core_ext.rs tests these sections through the real snapshot loader.