Artifacts

Artifacts include tools, drivers, hooks, and skills. Capsules declare required artifacts by full name and version in the manifest. A full name is <scope>/<name> — murmur/tool-git is the default artifact tool-git — and a session offers each artifact to the model by its bare name, the part after the /. See Artifact names.

Extension points

Agent capsules declare these extension points in their manifest:

Extension point	Declared as	Required?	If absent
Inference driver	inference.driver.artifact: <scope>/<name>	Yes	Error at launch
System prompt	inference.system_prompt* or artifact	No	Built-in default used
Tools	artifacts: with runtime: tool	No	Agent has no callable tools
Hooks	artifacts: with runtime: hook	No	No hook behavior

The session loop itself does not change when artifacts are added or removed.