cleveragents-core/docs/specification/glossary.md

Glossary

???+ abstract "Plan Lifecycle"

Plan
:   A ==ULID-identified==, hierarchical unit of work instantiated from an Action template. Progresses through four phases — **Action**, **Strategize**, **Execute**, **Apply** — persisting a decision tree at each step. May spawn child plans. Scoped to one or more projects. Top-level plans carry a namespaced name (`[[server:]namespace/]name`); child plans are identified solely by their plan ID (ULID). All plans are referenced by plan ID when precision is needed, especially in hierarchies containing subplans.

Action
:   A YAML-defined, reusable plan template specifying a description, definition of done, strategy/execution actors, typed arguments, and optional invariants. Project-agnostic until bound to one or more projects via `agents plan use`, which instantiates a Plan. Namespaced as `[[server:]namespace/]name`.

Strategize
:   Second phase of the plan lifecycle (following the Action phase). The first phase where active processing occurs. ==Read-only==: the strategy actor produces the initial decision tree — strategy choices, invariant enforcement records, resource selections, child plan blueprints — without modifying any resources.

Execute
:   Third phase of the plan lifecycle. The execution actor carries out decisions from Strategize — invoking tools, spawning child plans, producing artifacts, creating checkpoints — with all mutations confined to a sandbox. May also create additional decisions constrained by Strategize-phase decisions, based on runtime discoveries.

Apply
:   Fourth and final phase of the plan lifecycle. Merges the sandbox changeset into real project resources. Terminal states: `applied` (success), `constrained` (cannot complete — may revert to Strategize), `errored` (failed), `cancelled` (user/system cancelled).

Decision
:   A persisted choice point in a plan's decision tree, created during Strategize or Execute. Records the question, chosen option, alternatives, confidence score, rationale, context snapshot, and downstream dependencies. Types: `prompt_definition`, `invariant_enforced`, `strategy_choice`, `subplan_spawn`, `subplan_parallel_spawn`, among others. Supports targeted correction with selective subtree recomputation.

Invariant
:   A natural-language constraint on plan execution scoped to global, project, action, or plan level. Action invariants are promoted to plan-level when the action is used, so the runtime precedence chain is three-tier: ==plan > project > global==. Reconciled by the Invariant Reconciliation Actor at the start of Strategize; recorded as `invariant_enforced` decisions that propagate to child plans.

Automation Profile
:   A named set of confidence thresholds (each `0.0`–`1.0`) gating which plan operations proceed automatically versus requiring human approval. `0.0` = always automatic; `1.0` = always manual. Eight built-in profiles (`manual` through `full-auto`). Custom profiles namespaced as `[[server:]namespace/]name`. Each profile composes a **Safety Profile** that controls hard safety constraints (sandbox, checkpoint, unsafe-tool gating, skill restrictions, cost/retry limits).

Safety Profile
:   A composed sub-model of an Automation Profile that groups all hard safety constraints: `require_sandbox`, `require_checkpoints`, `allow_unsafe_tools`, `require_human_approval`, `allowed_skill_categories`, `max_cost_per_plan`, `max_retries_per_step`, and `max_total_cost`. Safety profiles can also be referenced standalone on Actions when only safety constraints (without full autonomy thresholds) are needed. See [ADR-041](adr/ADR-041-safety-profile-extraction.md).

???+ abstract "Projects & Resources"

Project
:   A named scope linking resources (from the Resource Registry), context policies, invariants, and validation attachments. Does not own resources; a single resource may be linked to multiple projects. Identified solely by its namespaced name (`[[server:]namespace/]name`) — no ULID is generated. May be local or remote.

Resource
:   A ULID-identified entity registered in the Resource Registry representing anything readable, writable, or queryable (git repos, filesystems, databases, etc.). Classified as physical or virtual, typed by a Resource Type, and organized in a DAG via parent/child links.

Resource Type
:   A schema-level definition constraining a category of resources. Specifies accepted CLI arguments, physical/virtual classification, permitted parent/child type relationships, auto-discovery rules, sandbox strategy, and handler implementation. Built-in types (e.g., `git-checkout`, `fs-mount`) are unnamespaced; custom types are namespaced as `[[server:]namespace/]name`. Resource types support single inheritance via the `inherits` field — see [ADR-042](adr/ADR-042-resource-type-inheritance.md).

Resource Type Inheritance
:   A mechanism allowing one resource type to inherit properties, capabilities, child types, sandbox strategy, and handler behavior from another type via the `inherits` field in the type definition. Subtypes can selectively override or extend any inherited field. Tools bound to a parent type automatically work with all subtypes (polymorphic matching). Auto-discovery child type matching and DAG queries are also polymorphic. Single inheritance only; maximum chain depth of 5 levels. See [ADR-042](adr/ADR-042-resource-type-inheritance.md).

Devcontainer
:   A container execution environment defined by a `.devcontainer/devcontainer.json` configuration file per the [Development Containers Specification](https://containers.dev). Auto-discovered when a `git-checkout` or `fs-directory` resource contains a `.devcontainer/` directory. Represented as a `devcontainer-instance` resource type that inherits from `container-instance`. Uses lazy activation — the container is only built when first needed by a plan. See [ADR-043](adr/ADR-043-devcontainer-integration.md).

Execution Environment
:   The runtime context in which tools execute — either the host system or a specific container. Configurable at project scope (`execution_environment` preference), plan scope (`--execution-environment` flag), and resource scope (auto-detected devcontainers). Precedence resolution determines which environment is used when multiple are configured, with `priority: override` forcing a specific container and `priority: fallback` deferring to auto-detected devcontainers. See [ADR-043](adr/ADR-043-devcontainer-integration.md).

Physical Resource
:   A resource bound to a concrete, located artifact — a specific file at a specific path, a specific repo at a specific URL. Directly readable and writable by tools. Two physical resources with identical content remain distinct instances.

Virtual Resource
:   A resource representing an abstract equivalence identity that links physical resources sharing the same content, hash, or name. ==Has no location; cannot be directly read or written.== Equivalence relationships update when underlying physical resources diverge.

Resource Binding
:   The association between a tool and the resources it operates on, declared via typed resource slots. Slots resolve through **contextual binding** (from the plan's project), **static binding** (hardcoded at registration), or **parameter binding** (passed at invocation).

Resource Registry
:   The persistent catalog of all registered resources and their DAG relationships (parent/child links). One of the core registries, alongside the Tool Registry, Skill Registry, Actor Registry, Provider Registry, and LSP Registry.

???+ abstract "Tools & Skills"

Tool
:   The ==atomic unit of execution==: a namespaced, independently registered callable operation. Defined by JSON Schema inputs/outputs, capability metadata (`read_only`, `writes`, `checkpointable`), and a four-stage lifecycle (`discover` / `activate` / `execute` / `deactivate`). Sources: MCP servers, Agent Skills folders, built-ins, or custom Python. Namespaced as `[[server:]namespace/]name`.

Validation
:   A Tool subtype adding: a `mode` (`required` | `informational`) controlling whether failure blocks execution; a structured JSON return with mandatory `passed` boolean, optional `data`, and optional `message`. ==Always read-only== (`writes = false`, `checkpointable = false`). May wrap an existing Tool via `wraps` + `transform`. Managed via `agents validation add/attach/detach`; always attached to a resource, optionally scoped to a project or plan.

Anonymous Tool
:   An inline tool definition embedded in a skill YAML or actor graph node. Same schema as a named tool but unregistered, unnamespaced, and scoped only to its defining context.

Skill
:   A composable, namespaced collection of tools assembled by referencing named tools, defining inline anonymous tools, including other skills, or exposing MCP server tools and Agent Skills ([AgentSkills.io](https://AgentSkills.io)) tools. Actors reference skills by name to acquire capabilities. Namespaced as `[[server:]namespace/]name`.

MCP (Model Context Protocol)
:   A standard for exposing tools and resources over a server boundary via JSON-RPC. CleverAgents discovers MCP tools through the `MCPToolAdapter` and registers them in the Tool Registry with extended capability metadata. MCP tools can be composed into skills and used as tool nodes in actor graphs.

Agent Skills ([AgentSkills.io](https://AgentSkills.io))
:   A standard for packaging instruction-driven, multi-step workflows as `SKILL.md` files with optional `scripts/`, `references/`, and `assets/` directories, using progressive disclosure. Surfaced as tools inside skills and loaded on demand by the actor runtime.

???+ abstract "Actors & Sessions"

Actor
:   A YAML-configured conversational unit — either a single LLM/agent or a composed LangGraph of actors and tool nodes. Specialized roles: strategy actor, execution actor, estimation actor, invariant reconciliation actor. Namespaced as `[[server:]namespace/]name`.

Session
:   A persistent conversation thread tied to an orchestrator actor. Maintains message history across plans and serves as the user's natural-language interface.

Server
:   An optional shared backend providing multi-user storage, namespace resolution, and remote plan execution.

???+ abstract "Protocols & Standards"

A2A (Agent-to-Agent Protocol)
:   The external **Agent-to-Agent (A2A) Protocol** standard ([a2a-protocol.org](https://a2a-protocol.org)), built on **JSON-RPC 2.0** (with gRPC and REST bindings available), used as the **sole** communication protocol for all client-server interaction. A2A is the successor to the Agent Client Protocol (ACP), which is now deprecated; A2A retains backward compatibility with ACP's JSON-RPC 2.0 foundation. A2A defines the **fundamental boundary between the Presentation and Application layers**. Standard A2A operations handle agent messaging (`message/send`, `message/stream`), task lifecycle, streaming updates, and Agent Card-based discovery. CleverAgents `_cleveragents/`-prefixed extension methods handle platform operations (plan lifecycle, registry CRUD, entity sync, namespace management, diagnostics). In local mode A2A flows over stdio via JSON-RPC (agent as subprocess); in server mode over HTTP. Every CLI command maps to an A2A operation. See [Core Concepts > Server > A2A](#agent-to-agent-protocol-a2a) and [Server and Client Architecture](#server-and-client-architecture) for full detail.

LSP (Language Server Protocol)
:   A standard protocol for language intelligence, used in CleverAgents to attach semantic code understanding to actors and agents. LSP servers are registered in the global **LSP Registry** (namespaced as `[[server:]namespace/]name`) and bound to actor graph nodes via YAML configuration. Capabilities — diagnostics, type information, symbol navigation, completions, references, rename, code actions — are exposed as tools (via `LSPToolAdapter`) and as automatic context enrichment. Actors can bind LSP servers explicitly by name, by language, or automatically based on detected resource languages. The LSP Runtime in the Infrastructure layer manages server lifecycle, workspace mapping, and file synchronization. See [LSP Integration](#lsp-integration) for full detail.

???+ abstract "Naming & Identity"

Namespace
:   The scoping segment in the name format `[[server:]namespace/]name`. Defaults to `local/` when omitted. `local/` is reserved for local-only items. Non-`local/` namespaces with server omitted assume the default configured server. Built-in LLM actors use provider prefixes (e.g., `openai/`, `anthropic/`). Built-in resource types are unnamespaced.

ULID
:   ==Universally Unique Lexicographically Sortable Identifier.== Assigned to plans, decisions, resources, correction attempts, and validation attachments. Projects, actions, skills, and tools use their namespaced name as sole identifier instead.

???+ abstract "Context Management (ACMS)"

ACMS (Advanced Context Management System)
:   The pluggable, strategy-driven framework for assembling actor context. Comprises the UKO, CRP, pluggable context strategies, the Context Assembly Pipeline, and hot/warm/cold tiered storage with per-actor scoped views.

UKO (Universal Knowledge Ontology)
:   An RDF-based, inheritance-driven ontology representing resources at multiple abstraction levels with provenance and temporal versioning. Four layers: universal foundation, domain specializations (software, documents, data schemas, infrastructure), paradigm/format specializations (procedural programming, markdown), and technology-specific (Python, PostgreSQL). ==Semantically aware — implicit relationships are inferred from content analysis.==

CRP (Context Request Protocol)
:   A structured vocabulary through which actors declare needed information, desired detail depth, and scope.

Context Strategy
:   A pluggable retrieval component that searches for and assembles ContextFragments using a specific approach (keyword search, semantic embedding, graph navigation, temporal archaeology, etc.). Registered with the Context Assembly Pipeline; executed in parallel by the StrategyExecutor.

Context Assembly Pipeline
:   The central ACMS orchestrator. Ten pluggable Protocol-defined components in three phases: **Strategy Orchestration**, **Fragment Fusion**, and **Context Finalization**. Each component ships with a default implementation and is overridable at global, project, or plan scope.

Skeleton (context)
:   A compressed representation of a plan's accumulated context produced by the SkeletonCompressor. Propagated from parent plans to child plans as inherited context. Size governed by the `skeleton_ratio` budget parameter.