=== root/.pi/extensions/gortex/index.ts ===
// Gortex extension for the Pi coding agent (earendil-works/pi).
//
// Pi has no MCP support by design — the extension API's registerTool
// covers it. This extension does two things:
//
//   1. Exposes Gortex's graph tools as native Pi tools. On every
//      session_start the daemon is brought up (ensureDaemon) and the tools
//      are (re)registered — Pi has no MCP, so the extension does what an MCP
//      client's `gortex mcp` proxy does for it, and Pi resets the session's
//      tool registry on each /new, so registration must happen per session.
//      Each registered tool then shells `gortex call <name>`, which
//      relays to the daemon. This mirrors the daemon's own core/defer tool
//      surface: the configured eager preset (GORTEX_TOOLS, default `core`)
//      is discovered from `gortex tools list` and registered up front, and
//      the deferred remainder of the full (~175-tool) catalogue is reached
//      on demand via the `gortex_tools_search` meta-tool, which runs the
//      BM25 catalogue search and dynamically registers the matches — the
//      analogue of MCP's tools_search + server-side promotion. If the
//      daemon is unreachable at session_start no graph tools are
//      registered; discovery re-runs on the next session.
//
//   2. Re-creates the Claude-Code "prefer graph tools over raw file
//      reads" enforcement. Rather than re-implementing the deny logic in
//      TypeScript, every relevant lifecycle event is marshalled into a
//      normalized envelope and handed to `gortex hook --agent=pi`, whose
//      decision is applied here. The Go side owns the deny / enrich /
//      consult-unlock / nudge postures, identical to every other agent.
//
// This file is written verbatim by the `pi` agent adapter, except for four
// templated sentinels the adapter replaces at install time:
//
//   "gortex"        -> a JSON string: the resolved `gortex` binary path
//   ["gortex","hook","--agent=pi"]  -> a JSON array: the full hook argv, e.g.
//                            ["/usr/local/bin/gortex","hook","--agent=pi"]
//                            (with a trailing "--mode=<mode>" when non-deny)
//   false    -> a JSON boolean: whether to wire the read-discipline
//                            enforcement (false when installed with --no-hooks;
//                            the graph tools + orientation are still wired)
//   "core" -> a JSON string: the default eager tool preset
//                            (core|edit|nav|readonly|full); GORTEX_TOOLS in the
//                            environment overrides it at runtime.
//
// Each is emitted as a JSON literal so values containing spaces survive.
//
// NOTE: Pi is pre-1.0. The ExtensionAPI surface, event names, and the Pi
// built-in tool names mapped in normalizeToolCall() below are pinned to
// Pi's documented API (packages/coding-agent/docs/extensions.md). If a Pi
// upgrade renames an event or a built-in tool, adjust the small maps here
// — the Go side (the wire contract) stays unchanged.

// Zero runtime dependencies: only Node built-ins. The tool `parameters`
// below are plain JSON Schema objects rather than TypeBox schemas — Pi's
// tool layer accepts a plain JSON-schema object. This is deliberate: 
// a single-file auto-discovered extension has no package.json / node_modules, 
// so importing `typebox` would throw at load and take the whole extension
// (tools AND enforcement) down with it.
import { execFileSync, spawn } from "node:child_process";

const GORTEX_BIN: string = "gortex";
const HOOK_ARGV: string[] = ["gortex","hook","--agent=pi"];
const ENFORCE: boolean = false;

// Which eager preset to expose as native Pi tools, mirroring the Gortex
// daemon's own tool surface. The daemon defaults to the `core` preset in
// `defer` mode and lets GORTEX_TOOLS override it — so we honour the same
// env at runtime, falling back to the value baked at install time.
// Recognised: core | edit | nav | readonly | full (full = the whole
// catalogue eagerly). The deferred remainder is reachable via
// `gortex_tools_search` below.
const TOOLS_PRESET: string = ((process.env && process.env.GORTEX_TOOLS) || "core").trim();

// Names (all gortex_-prefixed) of the Gortex tools registered into Pi.
const gortexToolNames = new Set<string>();

// Every Gortex tool is registered under a `gortex_` prefix so it can never
// silently clobber a Pi built-in or another extension's tool of the same
// name.
// The execute() closure still calls the daemon with the bare name.
const TOOL_PREFIX = "gortex_";
function piToolName(bare: string): string {
  return bare.startsWith(TOOL_PREFIX) ? bare : TOOL_PREFIX + bare;
}

// ---------------------------------------------------------------------------
// Subprocess helpers
// ---------------------------------------------------------------------------

function runGortex(args: string[], input?: string): string {
  return execFileSync(GORTEX_BIN, args, {
    input,
    encoding: "utf8",
    maxBuffer: 64 * 1024 * 1024,
    timeout: 30_000,
  }).trim();
}

// ensureDaemon brings the shared Gortex daemon up, the way an MCP host's
// `gortex mcp` does for other agents.
// Idempotent, fire-and-forget (we don't block on the launcher's ≤60s 
// readiness poll), and never throws — a missing binary or spawn failure
// must not take the extension down. The first tool calls either find it
// ready or degrade gracefully.
function ensureDaemon(): void {
  try {
    const child = spawn(GORTEX_BIN, ["daemon", "start", "--detach"], {
      stdio: "ignore",
      detached: true,
    });
    child.on("error", () => { }); // binary missing / spawn failure — swallow
    // No teardown counterpart, by design: the daemon is shared, long-lived
    // infrastructure that outlives the session — like `gortex mcp`.
    child.unref();
  } catch {
  }
}

interface PiDecision {
  block?: boolean;
  reason?: string;
  additional_context?: string;
  orientation?: string;
}

// callHook sends a normalized event envelope to `gortex hook --agent=pi`
// and parses the PiDecision it writes back. Fail-open: any error returns
// an empty decision so the extension never blocks Pi's flow on a hook
// hiccup (daemon down, parse error, timeout).
function callHook(envelope: Record<string, unknown>): PiDecision {
  try {
    const out = execFileSync(HOOK_ARGV[0], HOOK_ARGV.slice(1), {
      input: JSON.stringify(envelope),
      encoding: "utf8",
      maxBuffer: 16 * 1024 * 1024,
      timeout: 5_000,
    }).trim();
    if (!out) return {};
    return JSON.parse(out) as PiDecision;
  } catch {
    return {};
  }
}

// ---------------------------------------------------------------------------
// Tool-call normalization (Pi vocabulary -> canonical Claude-Code vocabulary)
// ---------------------------------------------------------------------------
//
// The Go enrich() classifier switches on Claude-Code tool names
// ("Read"/"Grep"/"Glob"/"Bash"/"Edit"/"Write") and reads canonical input
// keys ("file_path"/"pattern"/"command"). Pi uses its own lowercase names
// and input shapes, so we translate here — keeping all Pi-specific
// knowledge in this Pi-specific file.
const toolNameMap: Record<string, string> = {
  read: "Read",
  grep: "Grep",
  find: "Glob",
  ls: "Glob",
  bash: "Bash",
  edit: "Edit",
  write: "Write",
};

function firstString(obj: Record<string, unknown>, keys: string[]): string | undefined {
  for (const k of keys) {
    const v = obj[k];
    if (typeof v === "string" && v !== "") return v;
  }
  return undefined;
}

function normalizeToolCall(
  piName: string,
  piInput: Record<string, unknown>,
): { tool_name: string; tool_input: Record<string, unknown> } {
  const canonical = toolNameMap[piName.toLowerCase()] ?? piName;
  const out: Record<string, unknown> = { ...piInput };

  const path = firstString(piInput, ["file_path", "path", "file", "filepath", "absolute_path"]);
  if (path !== undefined) out.file_path = path;

  let pattern = firstString(piInput, ["pattern", "glob", "query", "regex", "name"]);
  if (pattern === undefined && canonical === "Glob") pattern = path;
  if (pattern !== undefined) out.pattern = pattern;

  const command = firstString(piInput, ["command", "cmd", "script"]);
  if (command !== undefined) out.command = command;

  return { tool_name: canonical, tool_input: out };
}

// ---------------------------------------------------------------------------
// Dynamic tool registration
// ---------------------------------------------------------------------------

interface ToolDescriptor {
  name: string;
  summary?: string;
  description?: string;
}

// presetListArgs maps the configured preset to `gortex tools list` flags.
// `full`/`all`/empty list the whole catalogue (no --preset filter); any
// other value is passed straight through so a preset added upstream works
// with no change here — the CLI is the source of truth for valid names. An
// unrecognised name simply matches nothing, and discoverTools falls back to
// the static set; the full catalogue stays reachable via search regardless.
function presetListArgs(): string[] {
  const base = ["tools", "list", "--format", "json"];
  const p = TOOLS_PRESET.toLowerCase();
  if (p === "" || p === "full" || p === "all") return base;
  return [...base, "--preset", p];
}

// discoverTools asks the daemon for the eager tool roster. Returns [] when
// the daemon is unreachable.
// TODO: poll for the daemon coming online mid-session and register then.
function discoverTools(): ToolDescriptor[] {
  try {
    const raw = runGortex(presetListArgs());
    const parsed = JSON.parse(raw) as ToolDescriptor[];
    if (Array.isArray(parsed) && parsed.length > 0) return parsed;
  } catch {
    // daemon down / not tracking — no tools registered this session.
  }
  return [];
}

// safeRegister registers a Pi tool, tolerating a redundant registration —
// a config reload can re-fire session_start without resetting the session's
// tool registry, in which case the name is already live and Pi may throw.
function safeRegister(pi: any, def: any): void {
  try {
    pi.registerTool(def);
  } catch {
    // already live this session — the existing registration stands.
  }
}

// registerOneTool registers a single Gortex tool as a native Pi tool named
// `gortex_<bare>`, whose execute() shells `gortex call <bare>`. Idempotent —
// a name already registered is skipped. Adds the prefixed name to
// gortexToolNames so the read-discipline postures treat a call to it as a
// graph query, not a raw file read. Used both for the eager preset and for
// tools promoted later by gortex_tools_search.
function registerOneTool(pi: any, desc: ToolDescriptor): void {
  const bare = desc.name;
  if (!bare) return;
  const name = piToolName(bare);
  if (gortexToolNames.has(name)) return;
  gortexToolNames.add(name);
  safeRegister(pi, {
    name,
    label: name,
    description: (desc.description || desc.summary || name).trim(),
    // Pass-through arguments: the model supplies whatever the underlying
    // Gortex tool accepts; `gortex call` validates names + args server
    // side and suggests near-matches on a typo.
    parameters: { type: "object", additionalProperties: true, properties: {} },
    async execute(_id: string, params: Record<string, unknown>) {
      try {
        const out = runGortex([
          "call",
          bare,
          "--json",
          JSON.stringify(params ?? {}),
          "--format",
          "gcx",
        ]);
        return { content: [{ type: "text", text: out }], details: {} };
      } catch (err: any) {
        const msg = err?.stderr?.toString?.() || err?.message || String(err);
        throw new Error(`gortex call ${bare} failed: ${msg}`);
      }
    },
  });
}

function registerGortexTools(pi: any): void {
  for (const desc of discoverTools()) registerOneTool(pi, desc);
}

// ---------------------------------------------------------------------------
// On-demand tool discovery (mirrors MCP tools_search + promotion)
// ---------------------------------------------------------------------------
//
// MCP clients on the default core/defer surface see only the eager preset;
// the rest of the catalogue is deferred behind the tools_search meta-tool,
// which returns a match's schema and PROMOTES it into the live server
// (firing notifications/tools/list_changed) so it becomes callable. Pi has
// no server-side promotion, so we replicate it: a single
// `gortex_tools_search` meta-tool runs the BM25 catalogue search and
// dynamically registers each match as a native Pi tool — Pi supports
// registering tools after session init.

const SEARCH_TOOL_NAME = piToolName("tools_search");

// firstSentence returns the leading sentence of a description, up to and
// including the first ". " boundary.
function firstSentence(desc: string): string {
  const t = desc.trim();
  if (!t) return "";
  const i = t.indexOf(". ");
  return i >= 0 ? t.slice(0, i + 1).trim() : t;
}

// parseToolSearchJSON parses `gortex tools search --format json` output —
// an array of {name, description}.
function parseToolSearchJSON(raw: string): ToolDescriptor[] {
  let parsed: Array<{ name: string; description?: string }>;
  try {
    parsed = JSON.parse(raw);
  } catch {
    return [];
  }
  if (!Array.isArray(parsed)) return [];
  return parsed
    .filter((e) => e && typeof e.name === "string" && e.name)
    .map((e) => ({
      name: e.name,
      description: e.description ?? "",
      summary: firstSentence(e.description ?? ""),
    }));
}

function searchTools(query: string, limit: number): ToolDescriptor[] {
  return parseToolSearchJSON(
    runGortex(["tools", "search", query, "--limit", String(limit), "--format", "json"]),
  );
}

function registerSearchTool(pi: any): void {
  if (gortexToolNames.has(SEARCH_TOOL_NAME)) return;
  gortexToolNames.add(SEARCH_TOOL_NAME);
  safeRegister(pi, {
    name: SEARCH_TOOL_NAME,
    label: SEARCH_TOOL_NAME,
    description:
      "Search the full Gortex tool catalogue and register the matches as callable tools. " +
      "Use this when the eagerly-loaded set doesn't cover what you need — e.g. taint_paths, " +
      "flow_between, contracts, find_clones, pr_risk, overlay/simulation tools. Returns the " +
      "names + summaries now available; call them directly on the next turn. (Gortex graph tool.)",
    parameters: {
      type: "object",
      additionalProperties: false,
      properties: {
        query: {
          type: "string",
          description: "What you want to do, e.g. 'trace taint to a sink' or 'detect duplicate code'.",
        },
        limit: {
          type: "number",
          description: "Maximum number of tools to register (default 5).",
        },
      },
      required: ["query"],
    },
    async execute(_id: string, params: Record<string, unknown>) {
      const query = typeof params?.query === "string" ? params.query.trim() : "";
      if (!query) {
        return {
          content: [{ type: "text", text: "Provide a 'query' describing the tool you need." }],
          details: {},
        };
      }
      const rawLimit = typeof params?.limit === "number" ? Math.floor(params.limit) : 5;
      const limit = rawLimit > 0 ? rawLimit : 5;

      let matches: ToolDescriptor[];
      try {
        matches = searchTools(query, limit);
      } catch (err: any) {
        const msg = err?.stderr?.toString?.() || err?.message || String(err);
        throw new Error(`gortex tools search failed: ${msg}`);
      }

      const newlyAvailable: string[] = [];
      for (const desc of matches) {
        const name = desc.name ? piToolName(desc.name) : "";
        if (!name || name === SEARCH_TOOL_NAME) continue;
        if (!gortexToolNames.has(name)) newlyAvailable.push(name);
        registerOneTool(pi, desc); // idempotent
      }

      // Report the prefixed names — that's what the model calls them by.
      const lines = matches
        .filter((d) => d.name && piToolName(d.name) !== SEARCH_TOOL_NAME)
        .map((d) => `- ${piToolName(d.name)}${d.summary ? ` — ${d.summary}` : ""}`);
      const header =
        matches.length === 0
          ? `No tools matched "${query}".`
          : newlyAvailable.length > 0
            ? `Registered ${newlyAvailable.length} tool(s) — now callable: ${newlyAvailable.join(", ")}.`
            : "Matching tools are already registered and callable.";
      return { content: [{ type: "text", text: [header, ...lines].join("\n") }], details: {} };
    },
  });
}

// ---------------------------------------------------------------------------
// Extension entry point
// ---------------------------------------------------------------------------

export default function (pi: any) {
  let orientationInjected = false;
  // Orientation awaiting injection into the next LLM call. The `context`
  // hook appends it as a tail user message rather than mutating
  // systemPrompt: a systemPrompt change sits at messages[0] and invalidates
  // prefix prompt caching. Computed once per session.
  let pendingOrientation = "";

  // Pi resets the session's tool registry on every session_start, so
  // (re)register here. Clear the name guard first — it persists across
  // sessions and would otherwise suppress re-registration.
  pi.on("session_start", () => {
    orientationInjected = false;
    pendingOrientation = "";
    ensureDaemon();
    gortexToolNames.clear();
    registerGortexTools(pi);
    registerSearchTool(pi);
  });

  // Fires before the agent loop's first LLM call. It can't mutate messages
  // itself, so it just parks the orientation for the `context` hook.
  pi.on("before_agent_start", () => {
    if (orientationInjected) return;
    const decision = callHook({ event: "session_start", cwd: pi?.cwd ?? process.cwd() });
    if (decision.orientation) {
      pendingOrientation = decision.orientation;
      orientationInjected = true;
    }
    return;
  });

  // Fires before each LLM call with a mutable message array. Append the
  // parked orientation once, then clear it so it isn't repeated each call.
  pi.on("context", (event: any) => {
    if (!pendingOrientation) return;
    const text = pendingOrientation;
    pendingOrientation = "";
    try {
      if (event && Array.isArray(event.messages)) {
        event.messages.push({ role: "user", content: text });
        return { messages: event.messages };
      }
    } catch {
      // best effort — never break context assembly.
    }
    return;
  });

  if (!ENFORCE) return;

  // Enforcement: every non-Gortex tool call is checked against the Go hook.
  pi.on("tool_call", async (event: any, ctx: any) => {
    const piName: string = event?.toolName ?? "";
    const piInput: Record<string, unknown> = event?.input ?? {};
    const isGortexTool = gortexToolNames.has(piName);

    const norm = normalizeToolCall(piName, piInput);
    const decision = callHook({
      event: "tool_call",
      tool_name: norm.tool_name,
      tool_input: norm.tool_input,
      cwd: ctx?.cwd ?? pi?.cwd ?? process.cwd(),
      session_id: ctx?.sessionManager?.sessionId ?? "",
      is_gortex_tool: isGortexTool,
    });

    if (decision.block) {
      return { block: true, reason: decision.reason ?? "[Gortex] blocked — prefer graph tools." };
    }
    if (decision.additional_context) {
      // Soft guidance: surface it without blocking the call.
      try {
        pi.sendMessage(
          { customType: "gortex", content: decision.additional_context, display: true },
          { deliverAs: "steer" },
        );
      } catch {
        // sendMessage shape can vary across Pi versions; never fatal.
      }
    }
    return;
  });
}
=== root/AGENTS.md ===
<!-- gortex:communities:start -->
- [example-community](.claude/skills/example/SKILL.md) — example routing block

<!-- gortex:communities:end -->