Term	Definition
Agent	A model running in a loop with tools, described by an AgentSpec.
AgentSpec	Declarative agent definition: role, system prompt, tools, model, thinking level, step budget.
Artefact	A file produced by a phase (spec.md, plan.json, qa_report.json, …).
Base branch	The branch worktrees are created from and merged into.
Complexity	trivial, simple, standard or complex; selects the pipeline profile.
Event	A structured notification published on the EventBus (phase started, tool called, …).
Hook	Extension that observes or vetoes phases and tool calls and can enrich prompts.
Memory	Knowledge retained across runs (gotchas, patterns, decisions).
Phase	One stage of the pipeline: assess, spec, plan, build, qa, fix, merge.
Pipeline	The state machine that drives a task through its phases.
Plugin	A bundle of extensions, in-process (Rust) or out-of-process (any language).
Profile	The list of phases chosen for a complexity class.
Provider	A model back-end (ModelProvider), e.g. Anthropic, OpenAI-compatible, mock.
QA report	Structured verdict of the reviewer: approved, changes_requested or inconclusive, with issues.
Registry	The collection of every provider, tool, agent, workspace, memory store and hook available to a run.
Run	One execution of the pipeline on a task, identified by a RunId.
Spec	Specification: summary, requirements with acceptance criteria, gathered context.
Subtask	Smallest unit of implementation work, executed by one coder session.
Task	The unit of work handed to the framework.
Thinking level	Reasoning budget requested from the model: off, low, medium, high, max.
Tool	A capability an agent may invoke (read a file, run a command, …).
VPP	Vibe Plugin Protocol: JSON-RPC 2.0 over stdio, MCP-shaped.
Workspace	The directory a task’s agents are confined to; a git worktree by default.