# API reference Source: https://libtmux.org/en/raku/latest/reference/ > Types, methods, and functions in libtmux for Raku. Browse the Raku types and operations for working with tmux. Start with the core objects below, or search for a type or member. Server 4 types [Server](https://libtmux.org/en/raku/latest/reference/libtmux-server/) class 46 members [Endpoint](https://libtmux.org/en/raku/latest/reference/libtmux-engine-endpoint/) class 10 members Immutable connection settings. Construction performs no tmux operation. [Incarnation](https://libtmux.org/en/raku/latest/reference/libtmux-engine-incarnation/) class 7 members Value-only daemon identity. Retaining it keeps no process or executor alive. [Observation](https://libtmux.org/en/raku/latest/reference/libtmux-engine-observation/) class 3 members One immutable pairing of daemon identity and capability evidence. Session 5 types, 1 function or constant [Session](https://libtmux.org/en/raku/latest/reference/libtmux-model-session/) class 22 members Captured session with local window-link and group relationships. [SessionGroup](https://libtmux.org/en/raku/latest/reference/libtmux-model-sessiongroup/) class 14 members Captured session group whose members are resolved within this graph. [SessionGroupSelection](https://libtmux.org/en/raku/latest/reference/libtmux-model-sessiongroupselection/) class 23 members Replayable typed sessiongroup membership with local filtering. [SessionRef](https://libtmux.org/en/raku/latest/reference/libtmux-model-sessionref/) class 16 members Value-only command target for a session in one daemon incarnation. [SessionSelection](https://libtmux.org/en/raku/latest/reference/libtmux-model-sessionselection/) class 23 members Replayable typed session membership with local filtering. [SessionId](https://libtmux.org/en/raku/latest/reference/libtmux-types-sessionid/) type alias A session identifier's spelling; existence and daemon ownership are separate. Window 6 types, 1 function or constant [Window](https://libtmux.org/en/raku/latest/reference/libtmux-model-window/) class 24 members Captured physical window; session-relative indices belong to WindowLink. [WindowLink](https://libtmux.org/en/raku/latest/reference/libtmux-model-windowlink/) class 20 members One captured session/index association with an expected physical window. [WindowLinkRef](https://libtmux.org/en/raku/latest/reference/libtmux-model-windowlinkref/) class 10 members A session/index target with an expected window. Renumbering checks are not atomic. [WindowLinkSelection](https://libtmux.org/en/raku/latest/reference/libtmux-model-windowlinkselection/) class 23 members Replayable typed window-link membership with local filtering. [WindowRef](https://libtmux.org/en/raku/latest/reference/libtmux-model-windowref/) class 18 members Value-only command target for a physical window, independent of its links. [WindowSelection](https://libtmux.org/en/raku/latest/reference/libtmux-model-windowselection/) class 23 members Replayable typed window membership with local filtering. [WindowId](https://libtmux.org/en/raku/latest/reference/libtmux-types-windowid/) type alias A physical window identifier. An index in a session is a different value. Pane 3 types, 1 function or constant [Pane](https://libtmux.org/en/raku/latest/reference/libtmux-model-pane/) class 45 members Captured pane fields and its local physical-window relationship. [PaneRef](https://libtmux.org/en/raku/latest/reference/libtmux-model-paneref/) class 38 members Value-only command target for a physical pane in one daemon incarnation. [PaneSelection](https://libtmux.org/en/raku/latest/reference/libtmux-model-paneselection/) class 23 members Replayable typed pane membership with local filtering. [PaneId](https://libtmux.org/en/raku/latest/reference/libtmux-types-paneid/) type alias A pane identifier scoped to a captured daemon incarnation. Client 7 types [Client](https://libtmux.org/en/raku/latest/reference/libtmux-client/) module In LibTmux 3 members [Client](https://libtmux.org/en/raku/latest/reference/libtmux-model-client/) class In LibTmux::Model 24 members Captured attached-client fields; commands use its separate reference. [Attachment](https://libtmux.org/en/raku/latest/reference/libtmux-attachment/) class 14 members [ClientTarget](https://libtmux.org/en/raku/latest/reference/libtmux-client-clienttarget/) class 26 members A value-only client target. No subprocess or connection is retained. [MenuItem](https://libtmux.org/en/raku/latest/reference/libtmux-client-menuitem/) class 5 members A menu entry. Empty labels are separators; labels retain tmux display styles. [ClientRef](https://libtmux.org/en/raku/latest/reference/libtmux-model-clientref/) class 24 members A captured client identity with explicit inspection and inherited client commands. [ClientSelection](https://libtmux.org/en/raku/latest/reference/libtmux-model-clientselection/) class 23 members Replayable typed client membership with local filtering. Hooks 1 type [Hooks](https://libtmux.org/en/raku/latest/reference/libtmux-configuration-hooks/) class 6 members Named hook command arrays. Reading a hook never executes its command source. Options 2 types [OptionSpec](https://libtmux.org/en/raku/latest/reference/libtmux-catalogue-optionspec/) class 12 members One source-qualified option type, scope and operand range. [OptionValue](https://libtmux.org/en/raku/latest/reference/libtmux-configuration-optionvalue/) class 4 members One observed option value. The source schema determines its native scalar type. Keys and bindings 2 types [KeyBinding](https://libtmux.org/en/raku/latest/reference/libtmux-configuration-keybinding/) class 6 members Captured binding metadata. Legacy listings leave note-state Unloaded. [KeyBindings](https://libtmux.org/en/raku/latest/reference/libtmux-configuration-keybindings/) class 5 members Server key tables. Invocation keeps stored command arguments distinct. Buffers 4 types [BufferInfo](https://libtmux.org/en/raku/latest/reference/libtmux-configuration-bufferinfo/) class 4 members Buffer metadata is separate from explicitly acquired binary contents. [Buffers](https://libtmux.org/en/raku/latest/reference/libtmux-configuration-buffers/) class 7 members Server-scoped paste buffers with binary load and save operations. [Buffer](https://libtmux.org/en/raku/latest/reference/libtmux-model-buffer/) class 14 members Captured buffer metadata; it does not retain or implicitly load buffer content. [BufferSelection](https://libtmux.org/en/raku/latest/reference/libtmux-model-bufferselection/) class 23 members Replayable typed buffer membership with local filtering. Layout and geometry 2 types, 1 function or constant [Layout](https://libtmux.org/en/raku/latest/reference/libtmux-layout/) module In LibTmux 3 members [Layout](https://libtmux.org/en/raku/latest/reference/libtmux-layout-layout/) class In LibTmux::Layout 12 members Decoded layout plus exact source bytes, including unsupported future versions. [decode-layout](https://libtmux.org/en/raku/latest/reference/libtmux-layout-decode-layout/) function Decode a declared dialect. Unknown versions retain bytes without a guessed tree. Environment 2 types [Environment](https://libtmux.org/en/raku/latest/reference/libtmux-configuration-environment/) class 6 members Session or global environment, including hidden and removed entries. [EnvironmentValue](https://libtmux.org/en/raku/latest/reference/libtmux-configuration-environmentvalue/) class 6 members Environment absence and an explicit removed marker are different states. Terminal capabilities 1 type [Capabilities](https://libtmux.org/en/raku/latest/reference/libtmux-capabilities/) class 21 members Versions 5 types, 3 functions and constants [Catalogue](https://libtmux.org/en/raku/latest/reference/libtmux-catalogue/) module 7 members Packaged, source-qualified fields, relationships, options and release profiles. [CatalogueData](https://libtmux.org/en/raku/latest/reference/libtmux-catalogue-cataloguedata/) class 14 members Typed schema lookup used by acquisition, local criteria and documentation. [SupportPolicy](https://libtmux.org/en/raku/latest/reference/libtmux-catalogue-supportpolicy/) class 5 members Ordered release profiles are the sole source of the floor and CI endpoints. [TmuxVersion](https://libtmux.org/en/raku/latest/reference/libtmux-catalogue-tmuxversion/) class 7 members Parsed release spelling; an exact release can still lack a support profile. [SupportState](https://libtmux.org/en/raku/latest/reference/libtmux-types-supportstate/) enum 3 members Capability evidence never treats an unprobed feature as supported. [catalogue](https://libtmux.org/en/raku/latest/reference/libtmux-catalogue-catalogue/) function Return the validated packaged catalogue; no tmux command is executed. [parse-tmux-version](https://libtmux.org/en/raku/latest/reference/libtmux-catalogue-parse-tmux-version/) function Preserve the raw string and reject vendor/development suffixes as unqualified. [support-policy](https://libtmux.org/en/raku/latest/reference/libtmux-catalogue-support-policy/) function Return the immutable release policy without reading configuration or contacting tmux. Commands 11 types [Batch](https://libtmux.org/en/raku/latest/reference/libtmux-batch/) module In LibTmux 5 members [Batch](https://libtmux.org/en/raku/latest/reference/libtmux-batch-batch/) class In LibTmux::Batch 8 members A finite replayable sequence of explicit commands, without transaction semantics. [Evidence](https://libtmux.org/en/raku/latest/reference/libtmux-batch-evidence/) class 4 members Caller-supplied evidence for one named operation, not a command acknowledgement. [Operation](https://libtmux.org/en/raku/latest/reference/libtmux-batch-operation/) class 5 members One immutable command and an explicit completion contract. [Report](https://libtmux.org/en/raku/latest/reference/libtmux-batch-report/) class 10 members Captured per-operation results. No runtime, control owner or caller task is retained. [CommandTemplate](https://libtmux.org/en/raku/latest/reference/libtmux-client-commandtemplate/) class 2 members Explicit tmux command-template syntax, including percent substitutions. [Command](https://libtmux.org/en/raku/latest/reference/libtmux-command/) module In LibTmux 1 member [Invocation](https://libtmux.org/en/raku/latest/reference/libtmux-command-invocation/) class 3 members One copied tmux command with distinct argv and command-language encodings. [Transport](https://libtmux.org/en/raku/latest/reference/libtmux-transport/) module 2 members [Cancellation](https://libtmux.org/en/raku/latest/reference/libtmux-transport-cancellation/) class 4 members One-shot cancellation shared by explicitly selected operations. [Outcome](https://libtmux.org/en/raku/latest/reference/libtmux-types-outcome/) enum 5 members What the caller knows about an operation's effects. Control mode 6 types [Control](https://libtmux.org/en/raku/latest/reference/libtmux-control/) module 7 members [Connection](https://libtmux.org/en/raku/latest/reference/libtmux-control-connection/) class 34 members [Decoder](https://libtmux.org/en/raku/latest/reference/libtmux-control-decoder/) class 7 members Incremental LF framing with exact response guards and bounded retained data. [PaneOutput](https://libtmux.org/en/raku/latest/reference/libtmux-control-paneoutput/) class 4 members Pane output is terminal bytes, not an independently decodable UTF-8 string. [Response](https://libtmux.org/en/raku/latest/reference/libtmux-control-response/) class 6 members A matched command guard pair acknowledges execution, not asynchronous effects. [UnframedOutput](https://libtmux.org/en/raku/latest/reference/libtmux-control-unframedoutput/) class 1 member Some queued jobs print after their end guard; preserve that unframed line. Formats 4 types [Format](https://libtmux.org/en/raku/latest/reference/libtmux-format/) module 3 members [DecodedRow](https://libtmux.org/en/raku/latest/reference/libtmux-format-decodedrow/) class 9 members Exact captured field bytes and scalar values. Text conversion is explicit. [FrameDecoder](https://libtmux.org/en/raku/latest/reference/libtmux-format-framedecoder/) class 8 members Incremental LF framing over bytes with terminal failure and explicit limits. [Projection](https://libtmux.org/en/raku/latest/reference/libtmux-format-projection/) class 11 members Ordered registered fields with an explicit acquisition context and codec. Queries 7 types [Query](https://libtmux.org/en/raku/latest/reference/libtmux-query/) module 3 members [Filter](https://libtmux.org/en/raku/latest/reference/libtmux-query-filter/) class 11 members A schema-validated local matcher with copied, immutable criteria and AST. [Limits](https://libtmux.org/en/raku/latest/reference/libtmux-query-limits/) class 4 members Immutable resource limits applied before recursive validation or JSON parsing. [Plan](https://libtmux.org/en/raku/latest/reference/libtmux-query-plan/) module In LibTmux::Query 1 member [Plan](https://libtmux.org/en/raku/latest/reference/libtmux-query-plan-plan/) class In LibTmux::Query::Plan 18 members Pure, inspectable source restrictions plus the original local filter. [Selection](https://libtmux.org/en/raku/latest/reference/libtmux-selection/) module In LibTmux 1 member [Selection](https://libtmux.org/en/raku/latest/reference/libtmux-selection-selection/) trait In LibTmux::Selection 23 members Eager captured membership; transformations perform no acquisition or commands. Queries — Expressions 1 type [LayoutNode](https://libtmux.org/en/raku/latest/reference/libtmux-layout-layoutnode/) class 15 members An immutable observed layout cell; floating leaves need not tile their parent. Snapshots 3 types [Snapshot](https://libtmux.org/en/raku/latest/reference/libtmux-model-snapshot/) class 17 members Captured records and indexed relations; it retains no transport or live owner. [View](https://libtmux.org/en/raku/latest/reference/libtmux-model-view/) class 12 members A local view of one captured record. Accessors and relations never perform I/O. [ValueState](https://libtmux.org/en/raku/latest/reference/libtmux-types-valuestate/) enum 5 members Availability states preserve absence without conflating false, zero or empty text. Errors 10 types [Exceptions](https://libtmux.org/en/raku/latest/reference/libtmux-exceptions/) module 9 members Typed acquisition, decoding, query, ownership and command failures. [LibTmux](https://libtmux.org/en/raku/latest/reference/x-libtmux/) exception In X 1 member Base for explicit library failures; operational failures are never absence. [Cardinality](https://libtmux.org/en/raku/latest/reference/x-libtmux-cardinality/) exception 2 members Exact or optional cardinality was violated. [Command](https://libtmux.org/en/raku/latest/reference/x-libtmux-command/) exception In X::LibTmux 10 members A child command failed; outcome states whether an effect may have occurred. [Decode](https://libtmux.org/en/raku/latest/reference/x-libtmux-decode/) exception 4 members Captured bytes violate the declared projection or field codec. [InconsistentSnapshot](https://libtmux.org/en/raku/latest/reference/x-libtmux-inconsistentsnapshot/) exception 2 members Contextual rows disagree about one physical entity in a capture interval. [InvalidFilter](https://libtmux.org/en/raku/latest/reference/x-libtmux-invalidfilter/) exception 1 member Criteria are invalid before any collection traversal occurs. [MissingData](https://libtmux.org/en/raku/latest/reference/x-libtmux-missingdata/) exception 2 members A requested local field or relation was not acquired in this observation. [StaleReference](https://libtmux.org/en/raku/latest/reference/x-libtmux-stalereference/) exception A target belongs to a daemon incarnation which is no longer current. [Unsupported](https://libtmux.org/en/raku/latest/reference/x-libtmux-unsupported/) exception 3 members A capability is unavailable or not established for the connected daemon. Constants and enums 5 types [OperationResult](https://libtmux.org/en/raku/latest/reference/libtmux-batch-operationresult/) class 14 members One position's outcome, preserving its acknowledgement and original exception. [Options](https://libtmux.org/en/raku/latest/reference/libtmux-configuration-options/) class 8 members Typed native options. Reads and writes are explicit daemon operations. [Event](https://libtmux.org/en/raku/latest/reference/libtmux-control-event/) class 3 members One notification, retaining its original bytes without the record terminator. [UnknownEvent](https://libtmux.org/en/raku/latest/reference/libtmux-control-unknownevent/) class 1 member An unrecognized notification remains inspectable without interpreting its body. [Result](https://libtmux.org/en/raku/latest/reference/libtmux-transport-result/) class 9 members Captured child output. Complete means process completion, not application effects. Other 5 types, 2 functions and constants [LibTmux](https://libtmux.org/en/raku/latest/reference/libtmux/) module 18 members [Configuration](https://libtmux.org/en/raku/latest/reference/libtmux-configuration/) module 9 members [Engine](https://libtmux.org/en/raku/latest/reference/libtmux-engine/) module 3 members [Model](https://libtmux.org/en/raku/latest/reference/libtmux-model/) module 21 members [Types](https://libtmux.org/en/raku/latest/reference/libtmux-types/) module 8 members [Count](https://libtmux.org/en/raku/latest/reference/libtmux-types-count/) type alias A nonnegative count or dimension. Bool is deliberately not a number here. [Positive](https://libtmux.org/en/raku/latest/reference/libtmux-types-positive/) type alias A positive dimension or resource limit.