# tmux_capabilities Source: https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/ > Discover the fixed endpoint, server binding, enabled tools, criteria schema and limits. Acquires metadata; starts no daemon. toolMCPv0.1.0.alpha.2 MCP concept example Maintained as a working example of core library usage and deployment. Example APIs, tools and configuration may change without a compatibility or product support commitment. [What concept means](https://libtmux.org/en/tmux/guides/concept-examples/) * **tmux_capabilities**() tool\[[source](https://github.com/libtmux/libtmux-ruby/blob/dcc9f8b5a6970144a9e7d80cd5f381d8f6198372/gems/libtmux-mcp/lib/libtmux/mcp/catalog.rb#L249)][ΒΆ](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities) Discover the fixed endpoint, server binding, enabled tools, criteria schema and limits. Acquires metadata; starts no daemon. * MCP request method `tools/call` Send `tmux_capabilities` as the tool name, with the arguments below. * Tool selection Enabled by default. ## Arguments[#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.parameters) No named arguments. * additionalProperties `false` ## Result[#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.result) Returns [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") | [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") Matches exactly one variant. * [**Variant 1**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0) * additionalProperties `false` - [**data**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata) * additionalProperties `false` - [**authored_run**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run) * additionalProperties `false` - [**authorization**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fauthorization): "exact_generation_at_queue_grant" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fauthorization) - [**availability**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Favailability): "conditional" | "unsupported" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Favailability) - [**descendant_termination**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fdescendant_termination): "unobserved" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fdescendant_termination) - [**enrollment**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fenrollment): "explicit_source" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fenrollment) - [**persistent_shell_changes**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fpersistent_shell_changes): false Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fpersistent_shell_changes) - [**requirements**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Frequirements): [Array](https://json-schema.org/understanding-json-schema/reference/array "Array (JSON Schema)")<[string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)")> Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Frequirements) - [**shell_profile**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fshell_profile): "zsh-5.9-zle" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fshell_profile) - [**stdin**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fstdin): "closed" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fstdin) - [**criteria_schema**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fcriteria_schema): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fcriteria_schema) - [**enabled_tools**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fenabled_tools): [Array](https://json-schema.org/understanding-json-schema/reference/array "Array (JSON Schema)")<[string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)")> Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fenabled_tools) - [**endpoint**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fendpoint): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fendpoint) - [**limits**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Flimits): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Flimits) * [**Additional properties**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Flimits%2FadditionalProperties): [number](https://json-schema.org/understanding-json-schema/reference/numeric "number (JSON Schema)") [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Flimits%2FadditionalProperties) - [**observation**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation) * additionalProperties `false` - [**history_continuity**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Fhistory_continuity): "unknown" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Fhistory_continuity) - [**process_cursor**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Fprocess_cursor): "conditional" | "unsupported" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Fprocess_cursor) - [**requirements**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Frequirements): [Array](https://json-schema.org/understanding-json-schema/reference/array "Array (JSON Schema)")<[string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)")> Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Frequirements) - [**screen**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Fscreen): "bounded_rows" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Fscreen) - [**wait_conditions**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Fwait_conditions): [Array](https://json-schema.org/understanding-json-schema/reference/array "Array (JSON Schema)")<"screen_contains" | "process_exit"> Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Fwait_conditions) - [**owns_daemon**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fowns_daemon): false Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fowns_daemon) - [**resource_subscriptions**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fresource_subscriptions): false Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fresource_subscriptions) - [**server_identity**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fserver_identity): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fserver_identity) * additionalProperties `false` - [**generation**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fserver_identity%2Fproperties%2Fgeneration): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fserver_identity%2Fproperties%2Fgeneration) - [**pid**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fserver_identity%2Fproperties%2Fpid): [integer](https://json-schema.org/understanding-json-schema/reference/numeric "integer (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fserver_identity%2Fproperties%2Fpid) - [**start_time**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fserver_identity%2Fproperties%2Fstart_time): [integer](https://json-schema.org/understanding-json-schema/reference/numeric "integer (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fserver_identity%2Fproperties%2Fstart_time) - [**tmux_version**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fserver_identity%2Fproperties%2Ftmux_version): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fserver_identity%2Fproperties%2Ftmux_version) - [**ok**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fok): true Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fok) * [**Variant 2**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1) * additionalProperties `false` - [**error**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror) * additionalProperties `false` - [**code**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Fcode): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Fcode) - [**delivery**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Fdelivery): "not_sent" | "possibly_sent" | "observed" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Fdelivery) - [**effects**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") Optional [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects) * additionalProperties `false` - [**created**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated): [Array](https://json-schema.org/understanding-json-schema/reference/array "Array (JSON Schema)")<[object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") | [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") | [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") | [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)")> Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated) * maxItems `3` - [**Items**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") | [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") | [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") | [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems) Matches exactly one variant. * [**Variant 1**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F0): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F0) * additionalProperties `false` - [**generation**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F0%2Fproperties%2Fgeneration): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F0%2Fproperties%2Fgeneration) * minLength `1` * maxLength `128` - [**id**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F0%2Fproperties%2Fid): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F0%2Fproperties%2Fid) * maxLength `32` * pattern `"^\\$[0-9]+$"` - [**kind**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F0%2Fproperties%2Fkind): "session" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F0%2Fproperties%2Fkind) * [**Variant 2**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F1): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F1) * additionalProperties `false` - [**generation**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F1%2Fproperties%2Fgeneration): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F1%2Fproperties%2Fgeneration) * minLength `1` * maxLength `128` - [**id**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F1%2Fproperties%2Fid): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F1%2Fproperties%2Fid) * maxLength `32` * pattern `"^@[0-9]+$"` - [**kind**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F1%2Fproperties%2Fkind): "window" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F1%2Fproperties%2Fkind) * [**Variant 3**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F2): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F2) * additionalProperties `false` - [**generation**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F2%2Fproperties%2Fgeneration): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F2%2Fproperties%2Fgeneration) * minLength `1` * maxLength `128` - [**id**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F2%2Fproperties%2Fid): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F2%2Fproperties%2Fid) * maxLength `32` * pattern `"^%[0-9]+$"` - [**kind**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F2%2Fproperties%2Fkind): "pane" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F2%2Fproperties%2Fkind) * [**Variant 4**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3): [object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)") [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3) * additionalProperties `false` - [**generation**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3%2Fproperties%2Fgeneration): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3%2Fproperties%2Fgeneration) * minLength `1` * maxLength `128` - [**id**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3%2Fproperties%2Fid): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3%2Fproperties%2Fid) * maxLength `32` * pattern `"^@[0-9]+$"` - [**index**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3%2Fproperties%2Findex): [integer](https://json-schema.org/understanding-json-schema/reference/numeric "integer (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3%2Fproperties%2Findex) * minimum `0` - [**kind**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3%2Fproperties%2Fkind): "window_link" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3%2Fproperties%2Fkind) - [**session_id**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3%2Fproperties%2Fsession_id): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3%2Fproperties%2Fsession_id) * maxLength `32` * pattern `"^\\$[0-9]+$"` - [**state**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fstate): "none" | "known" | "unknown" Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fstate) - [**message**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Fmessage): [string](https://json-schema.org/understanding-json-schema/reference/string "string (JSON Schema)") Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Fmessage) - [**ok**](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Fok): false Required [#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Fok) ## Annotations[#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.annotations) * [`destructiveHint`](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/reference/glossary/#destructiveHint) `false` * [`idempotentHint`](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/reference/glossary/#idempotentHint) `false` * [`openWorldHint`](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/reference/glossary/#openWorldHint) `false` * [`readOnlyHint`](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/reference/glossary/#readOnlyHint) `false` ## Protocol data[#](https://libtmux.org/en/ruby/v0.1.0.alpha.2/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.schemas) Use the complete advertised contract for validation and client integration. Input schema ```json { "$schema": "https://json-schema.org/draft/2020-12/schema", "additionalProperties": false, "properties": {}, "required": [], "type": "object" } ``` Output schema ```json { "$schema": "https://json-schema.org/draft/2020-12/schema", "oneOf": [ { "additionalProperties": false, "properties": { "data": { "additionalProperties": false, "properties": { "authored_run": { "additionalProperties": false, "properties": { "authorization": { "const": "exact_generation_at_queue_grant" }, "availability": { "enum": [ "conditional", "unsupported" ] }, "descendant_termination": { "const": "unobserved" }, "enrollment": { "const": "explicit_source" }, "persistent_shell_changes": { "const": false }, "requirements": { "items": { "type": "string" }, "type": "array" }, "shell_profile": { "const": "zsh-5.9-zle" }, "stdin": { "const": "closed" } }, "required": [ "availability", "shell_profile", "enrollment", "authorization", "stdin", "persistent_shell_changes", "descendant_termination", "requirements" ], "type": "object" }, "criteria_schema": { "type": "object" }, "enabled_tools": { "items": { "type": "string" }, "type": "array" }, "endpoint": { "type": "string" }, "limits": { "additionalProperties": { "type": "number" }, "type": "object" }, "observation": { "additionalProperties": false, "properties": { "history_continuity": { "const": "unknown" }, "process_cursor": { "enum": [ "conditional", "unsupported" ] }, "requirements": { "items": { "type": "string" }, "type": "array" }, "screen": { "const": "bounded_rows" }, "wait_conditions": { "items": { "enum": [ "screen_contains", "process_exit" ] }, "type": "array" } }, "required": [ "screen", "history_continuity", "process_cursor", "requirements", "wait_conditions" ], "type": "object" }, "owns_daemon": { "const": false }, "resource_subscriptions": { "const": false }, "server_identity": { "additionalProperties": false, "properties": { "generation": { "type": "string" }, "pid": { "type": "integer" }, "start_time": { "type": "integer" }, "tmux_version": { "type": "string" } }, "required": [ "generation", "pid", "start_time", "tmux_version" ], "type": "object" } }, "required": [ "endpoint", "server_identity", "enabled_tools", "criteria_schema", "limits", "owns_daemon", "resource_subscriptions", "authored_run", "observation" ], "type": "object" }, "ok": { "const": true } }, "required": [ "ok", "data" ], "type": "object" }, { "additionalProperties": false, "properties": { "error": { "additionalProperties": false, "properties": { "code": { "type": "string" }, "delivery": { "enum": [ "not_sent", "possibly_sent", "observed" ] }, "effects": { "additionalProperties": false, "properties": { "created": { "items": { "oneOf": [ { "additionalProperties": false, "properties": { "generation": { "maxLength": 128, "minLength": 1, "type": "string" }, "id": { "maxLength": 32, "pattern": "^\\$[0-9]+$", "type": "string" }, "kind": { "const": "session" } }, "required": [ "generation", "kind", "id" ], "type": "object" }, { "additionalProperties": false, "properties": { "generation": { "maxLength": 128, "minLength": 1, "type": "string" }, "id": { "maxLength": 32, "pattern": "^@[0-9]+$", "type": "string" }, "kind": { "const": "window" } }, "required": [ "generation", "kind", "id" ], "type": "object" }, { "additionalProperties": false, "properties": { "generation": { "maxLength": 128, "minLength": 1, "type": "string" }, "id": { "maxLength": 32, "pattern": "^%[0-9]+$", "type": "string" }, "kind": { "const": "pane" } }, "required": [ "generation", "kind", "id" ], "type": "object" }, { "additionalProperties": false, "properties": { "generation": { "maxLength": 128, "minLength": 1, "type": "string" }, "id": { "maxLength": 32, "pattern": "^@[0-9]+$", "type": "string" }, "index": { "minimum": 0, "type": "integer" }, "kind": { "const": "window_link" }, "session_id": { "maxLength": 32, "pattern": "^\\$[0-9]+$", "type": "string" } }, "required": [ "generation", "kind", "id", "session_id", "index" ], "type": "object" } ] }, "maxItems": 3, "type": "array" }, "state": { "enum": [ "none", "known", "unknown" ] } }, "required": [ "state", "created" ], "type": "object" }, "message": { "type": "string" } }, "required": [ "code", "message", "delivery" ], "type": "object" }, "ok": { "const": false } }, "required": [ "ok", "error" ], "type": "object" } ], "type": "object" } ```