# tmux_capabilities

Source: https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/

> Discover the fixed endpoint, server binding, enabled tools, criteria schema and limits. Acquires metadata; starts no daemon.

tool MCPv0.1.0.alpha.3

MCP concept example

A working example of the core library. It can change without notice.

[What concept means](https://libtmux.org/en/meta/support/#concept-and-alpha)

* **tmux_capabilities**()

  tool \[[source](https://github.com/libtmux/libtmux-ruby/blob/d8ce4bbee0ca7748a81929f81f7d8d07f8c51267/gems/libtmux-mcp/lib/libtmux/mcp/catalog.rb#L250)][¶](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.parameters)

  No named arguments.

  ## Result[#](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0)** ([object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)"))

    * **[`data`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

      * **[`authored_run`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

        * **[`authorization`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fauthorization)** ("exact_generation_at_queue_grant")

        * **[`availability`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Favailability)** ("conditional" | "unsupported")

        * **[`descendant_termination`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fdescendant_termination)** ("unobserved")

        * **[`enrollment`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fenrollment)** ("explicit_source")

        * **[`persistent_shell_changes`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fpersistent_shell_changes)** (false)

        * **[`requirements`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)")>)

        * **[`shell_profile`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fshell_profile)** ("zsh-5.9-zle")

        * **[`stdin`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fauthored_run%2Fproperties%2Fstdin)** ("closed")

        No other properties are accepted.

      * **[`criteria_schema`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

      * **[`enabled_tools`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)")>)

      * **[`endpoint`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

      * **[`limits`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Flimits)** ([Record](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)")\<string, [number](https://json-schema.org/understanding-json-schema/reference/numeric "numeric (JSON Schema)")>)

      * **[`observation`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

        * **[`history_continuity`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Fhistory_continuity)** ("unknown")

        * **[`process_cursor`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Fprocess_cursor)** ("conditional" | "unsupported")

        * **[`requirements`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)")>)

        * **[`screen`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fobservation%2Fproperties%2Fscreen)** ("bounded_rows")

        * **[`wait_conditions`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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">)

        No other properties are accepted.

      * **[`owns_daemon`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fowns_daemon)** (false)

      * **[`resource_subscriptions`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fdata%2Fproperties%2Fresource_subscriptions)** (false)

      * **[`server_identity`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

        * **[`generation`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

        * **[`pid`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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 "numeric (JSON Schema)"))

        * **[`start_time`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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 "numeric (JSON Schema)"))

        * **[`tmux_version`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

        No other properties are accepted.

      No other properties are accepted.

    * **[`ok`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F0%2Fproperties%2Fok)** (true)

    No other properties are accepted.

  * **[Variant 2](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1)** ([object](https://json-schema.org/understanding-json-schema/reference/object "object (JSON Schema)"))

    * **[`error`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

      * **[`code`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

      * **[`delivery`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Fdelivery)** ("not_sent" | "possibly_sent" | "observed")

      * **[`effects`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

        * **[`created`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)")>)

          * maxItems

            `3`

          - **[Items](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

            Matches exactly one variant.

            * **[Variant 1](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

              * **[`generation`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

                * minLength

                  `1`

                * maxLength

                  `128`

              * **[`id`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

                * maxLength

                  `32`

                * pattern

                  `"^\\$[0-9]+$"`

              * **[`kind`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F0%2Fproperties%2Fkind)** ("session")

              No other properties are accepted.

            * **[Variant 2](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

              * **[`generation`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

                * minLength

                  `1`

                * maxLength

                  `128`

              * **[`id`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

                * maxLength

                  `32`

                * pattern

                  `"^@[0-9]+$"`

              * **[`kind`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F1%2Fproperties%2Fkind)** ("window")

              No other properties are accepted.

            * **[Variant 3](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

              * **[`generation`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

                * minLength

                  `1`

                * maxLength

                  `128`

              * **[`id`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

                * maxLength

                  `32`

                * pattern

                  `"^%[0-9]+$"`

              * **[`kind`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F2%2Fproperties%2Fkind)** ("pane")

              No other properties are accepted.

            * **[Variant 4](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

              * **[`generation`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

                * minLength

                  `1`

                * maxLength

                  `128`

              * **[`id`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

                * maxLength

                  `32`

                * pattern

                  `"^@[0-9]+$"`

              * **[`index`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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 "numeric (JSON Schema)"))

                * minimum

                  `0`

              * **[`kind`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fcreated%2Fitems%2FoneOf%2F3%2Fproperties%2Fkind)** ("window_link")

              * **[`session_id`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

                * maxLength

                  `32`

                * pattern

                  `"^\\$[0-9]+$"`

              No other properties are accepted.

        * **[`state`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Ferror%2Fproperties%2Feffects%2Fproperties%2Fstate)** ("none" | "known" | "unknown")

        No other properties are accepted.

      * **[`message`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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)"))

      No other properties are accepted.

    * **[`ok`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.output%2FoneOf%2F1%2Fproperties%2Fok)** (false)

    No other properties are accepted.

  ## Annotations[#](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/tools/tmux_capabilities/#mcp.tool.tmux_capabilities.annotations)

  * [`destructiveHint`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/reference/glossary/#destructiveHint)

    `false`

  * [`idempotentHint`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/reference/glossary/#idempotentHint)

    `false`

  * [`openWorldHint`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/reference/glossary/#openWorldHint)

    `false`

  * [`readOnlyHint`](https://libtmux.org/en/ruby/v0.1.0.alpha.3/mcp/reference/glossary/#readOnlyHint)

    `false`

  ## Protocol data[#](https://libtmux.org/en/ruby/v0.1.0.alpha.3/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"
  }
  ```