# Pi subagent extension documentation census, 2026 — data dictionary

{
  "schemaVersion": 1,
  "title": "Pi subagent extension documentation census, 2026",
  "reviewedAt": "2026-10-21",
  "population": "8 selected Pi subagent extension projects; purposive documentation sample, not a complete directory.",
  "canonical": "https://subagentura.tech/pi-subagentura/statistics-2026/",
  "publisher": {
    "name": "subagentura",
    "maintainer": "lmn451",
    "url": "https://subagentura.tech/"
  },
  "disclosure": "The publisher maintains pi-subagentura, which is included in this selected sample. The counts describe reviewed documentation and do not estimate adoption, market share, quality, performance, or reliability.",
  "metadataUri": "https://subagentura.tech/pi-subagentura/statistics-2026/data-dictionary.txt",
  "method": "Classifications summarize each project's pinned public README or primary documentation. Undocumented is not interpreted as absent.",
  "fields": {
    "inProcess": [
      "standard",
      "experimental",
      "not-documented"
    ],
    "attachableTerminal": "Whether the reviewed source explicitly documents entering an attachable child terminal.",
    "worktrees": [
      "built-in-or-workflow",
      "companion",
      "existing-path",
      "not-documented"
    ],
    "worktreeScope": "Worktree-specific mechanisms only. Generic working-directory overrides such as cwd are not counted as a dedicated worktree feature.",
    "supportedTerminalEnvironments": "Named multiplexer or terminal environments explicitly documented as supported."
  },
  "definitions": {
    "inProcess": {
      "standard": "Documented as an ordinary supported execution path in the host Pi runtime.",
      "experimental": "Explicitly described as experimental inline or parent-local execution.",
      "not-documented": "No in-process path was identified in the reviewed source; this is not a claim of unsupported behavior."
    },
    "attachableTerminal": {
      "true": "The reviewed source explicitly documents entering or attaching to a child terminal session.",
      "false": "An attachable child terminal was not identified in the reviewed source; false does not mean unsupported."
    },
    "worktrees": {
      "built-in-or-workflow": "The reviewed core extension or its workflow layer documents creating an isolated worktree or repository copy.",
      "companion": "Worktree creation is documented through a separately installed companion package.",
      "existing-path": "A dedicated worktree-path control targets a checkout the caller prepared; generic cwd overrides are excluded.",
      "not-documented": "No worktree-specific mechanism was classified; a generic working-directory override may still accept a prepared checkout."
    }
  },
  "recordCount": 8,
  "statistics": {
    "sampleSize": 8,
    "inProcess": {
      "standard": 6,
      "experimental": 1,
      "notDocumented": 1
    },
    "attachableTerminal": 2,
    "worktrees": {
      "builtInOrWorkflow": 2,
      "companion": 1,
      "existingPath": 1,
      "notDocumented": 4
    },
    "terminalEnvironments": [
      "cmux",
      "Herdr",
      "tmux",
      "WezTerm",
      "Zellij"
    ]
  }
}