feat(export): add the ocx export CLI command

Phase 020 of devlog/_plan/260731_client_config_export.

`ocx export --client <opencode|pi>` prints the client config. With --json
stdout is the config and nothing else, so an agent can pipe it; without
it, the JSON is followed by the destination path, the merge warning, the
env line, and a count of models shipping without context limits.

--out writes the file but refuses to clobber an existing one without
--force, since the obvious target is a populated config whose other
providers would be lost.

Disabled rows are filtered here, at the /api/models boundary: the export
core dedupes and sorts but cannot see visibility state. A non-array
models payload is an error rather than an empty-model config.

Also corrects two example paths in the plan docs that tripped
privacy:scan.

Author: lidge-jun

devlog/_plan/260731_client_config_export/020_cli_surface.md

@@ -41,7 +41,7 @@ $ ocx export --client opencode
   ...
 }
 
-Destination: /Users/you/.config/opencode/opencode.json
+Destination: ~/.config/opencode/opencode.json
 Merge this provider block into that file; do not replace it.
 Before launching: export OPENCODEX_OPENCODE_API_KEY=<your ocx_... key>
 19 models; 2 omit context limits (the client applies its own defaults).

src/cli/export-command.ts

@@ -0,0 +1,187 @@
+/**
+ * `ocx export --client <opencode|pi>` — print a client config for the live proxy.
+ *
+ * Two consumers, one payload (devlog 260731_client_config_export/020):
+ *
+ * - **Agent** (`--json`): stdout is exactly the client config JSON and nothing else, so
+ *   `ocx export --client pi --json > models.json` is safe to pipe. Every diagnostic —
+ *   including the `--out` write note — goes to stderr.
+ * - **Human** (no flag): the JSON leads, then the destination path, the merge warning,
+ *   the env export line, and the model/degraded counts.
+ *
+ * The command never writes the user's real config path. `--out` is an explicit target and
+ * refuses to clobber an existing file without `--force`, because the common mistake
+ * (`--out ~/.config/opencode/opencode.json`) would silently destroy other providers.
+ *
+ * Serialization itself belongs to src/clients/config-export.ts; this module only resolves
+ * the base URL, filters the catalog, and renders. No secret is ever serialized: the config
+ * carries the client's documented env reference and the real key stays in the environment.
+ */
+import { writeFileSync } from "node:fs";
+import { loadConfig } from "../config";
+import {
+  EXPORT_CLIENTS,
+  EXPORT_CLIENT_IDS,
+  buildClientConfig,
+  isExportClientId,
+  opencodeProxyBaseUrl,
+  type ExportClientId,
+  type ExportModel,
+} from "../clients/config-export";
+import { opencodeCatalogFromProxyRows, type OpencodeProxyModelRow } from "./opencode";
+import type { OcxConfig } from "../types";
+import {
+  CliUsageError,
+  RuntimeApiError,
+  printData,
+  rejectArgs,
+  runCliAction,
+  runtimeBaseUrl,
+  runtimeRequest,
+  takeFlag,
+  takeOption,
+  type RuntimeApiDeps,
+} from "./runtime-api";
+
+const USAGE = `Usage:
+  ocx export --client <${EXPORT_CLIENT_IDS.join("|")}> [--json] [--out <path>] [--force]`;
+
+export interface ExportCommandDeps extends RuntimeApiDeps {
+  /** Live config seam; tests inject a fixture instead of reading the user's config. */
+  configImpl?: () => OcxConfig;
+}
+
+/**
+ * `/api/models` row plus the modality list Pi consumes. The launcher's row type predates
+ * the Pi exporter and stops at the fields OpenCode needs.
+ */
+type ExportProxyModelRow = OpencodeProxyModelRow & { inputModalities?: string[] };
+
+/** Same authoritativeness rule the serializers apply, for the degraded-count line. */
+function hasContextLimit(model: ExportModel): boolean {
+  return typeof model.contextWindow === "number"
+    && Number.isFinite(model.contextWindow)
+    && model.contextWindow > 0;
+}
+
+/**
+ * Export rows from proxy `/api/models` rows.
+ *
+ * `opencodeCatalogFromProxyRows` owns the visibility rules (drop `disabled`, drop dupes,
+ * drop native under Codex Direct) — the export core does none of that, so a row filtered
+ * here is the only thing keeping a disabled model out of a client's picker. Modalities are
+ * re-joined by `namespaced` because the launcher's catalog type does not carry them.
+ */
+export function exportModelsFromProxyRows(
+  rows: readonly ExportProxyModelRow[],
+  config: OcxConfig,
+): ExportModel[] {
+  const modalities = new Map<string, string[]>();
+  for (const row of rows) {
+    const namespaced = row.namespaced?.trim();
+    if (namespaced && Array.isArray(row.inputModalities) && row.inputModalities.length > 0) {
+      if (!modalities.has(namespaced)) modalities.set(namespaced, [...row.inputModalities]);
+    }
+  }
+  return opencodeCatalogFromProxyRows(rows, config).map(entry => {
+    const model: ExportModel = {
+      namespaced: entry.namespaced,
+      provider: entry.provider ?? (entry.native ? "openai" : "routed"),
+      id: entry.id ?? entry.namespaced,
+    };
+    if (entry.native) model.native = true;
+    if (entry.displayName) model.displayName = entry.displayName;
+    if (entry.contextWindow !== undefined) model.contextWindow = entry.contextWindow;
+    const input = modalities.get(entry.namespaced);
+    if (input) model.inputModalities = input;
+    return model;
+  });
+}
+
+/**
+ * `http://host:port/v1` for the proxy that is actually listening.
+ *
+ * `runtimeBaseUrl` is the identity-checked `findLiveProxy` probe the launcher uses, and it
+ * already throws the "Start it with: ocx start" error when nothing answers — so a config
+ * with an empty models block can never be emitted.
+ *
+ * Resolved ONCE and handed back to `runtimeRequest` as `baseUrl`, so the catalog and the
+ * exported endpoint can never come from two different probes.
+ */
+function proxyV1BaseUrl(root: string): string {
+  const url = new URL(root);
+  const port = url.port ? Number(url.port) : url.protocol === "https:" ? 443 : 80;
+  return opencodeProxyBaseUrl(port, url.hostname);
+}
+
+function parseClient(args: string[]): ExportClientId {
+  const raw = takeOption(args, "--client");
+  if (raw === undefined) {
+    throw new CliUsageError(`--client is required (${EXPORT_CLIENT_IDS.join(", ")})`, USAGE);
+  }
+  const client = raw.trim().toLowerCase();
+  if (!isExportClientId(client)) {
+    throw new CliUsageError(`--client must be one of: ${EXPORT_CLIENT_IDS.join(", ")}`, USAGE);
+  }
+  return client;
+}
+
+/**
+ * Write the config, refusing to replace an existing file without `--force`.
+ *
+ * The `wx` flag does the refusal in the kernel rather than after an `existsSync` check, so
+ * a file created between the two can never be truncated. Nothing is printed before this
+ * runs: a refusal leaves both the target bytes and stdout untouched.
+ */
+function writeExport(path: string, text: string, force: boolean): void {
+  try {
+    writeFileSync(path, text, force ? { encoding: "utf8" } : { encoding: "utf8", flag: "wx" });
+  } catch (error) {
+    if ((error as NodeJS.ErrnoException).code === "EEXIST") {
+      throw new CliUsageError(
+        `${path} already exists. Re-run with --force to replace it, or print the config and merge it yourself.`,
+        USAGE,
+      );
+    }
+    throw error;
+  }
+}
+
+export async function handleExportCommand(argv: string[], deps: ExportCommandDeps = {}): Promise<number> {
+  return runCliAction(async () => {
+    const args = [...argv];
+    const client = parseClient(args);
+    const wantsJson = takeFlag(args, "--json");
+    const force = takeFlag(args, "--force");
+    const out = takeOption(args, "--out");
+    rejectArgs(args, USAGE);
+
+    const spec = EXPORT_CLIENTS[client];
+    const config = (deps.configImpl ?? loadConfig)();
+    const root = await runtimeBaseUrl(deps);
+    const rows = await runtimeRequest<ExportProxyModelRow[]>("/api/models", {}, { ...deps, baseUrl: root });
+    if (!Array.isArray(rows)) {
+      throw new RuntimeApiError("Management API returned an unexpected /api/models payload.", 502, rows);
+    }
+    const models = exportModelsFromProxyRows(rows, config);
+    const clientConfig = buildClientConfig(client, { baseUrl: proxyV1BaseUrl(root), models, config });
+    const text = JSON.stringify(clientConfig, null, 2);
+
+    if (out !== undefined) writeExport(out, `${text}\n`, force);
+    // stderr, so `--json` stdout stays byte-exact for a redirect.
+    if (out !== undefined && wantsJson) console.error(`Wrote ${out}`);
+
+    const degraded = models.filter(model => !hasContextLimit(model)).length;
+    printData(clientConfig, wantsJson, [
+      text,
+      "",
+      ...(out !== undefined ? [`Wrote ${out}`] : []),
+      `Destination: ${spec.destination(process.env)}`,
+      "Merge this provider block into that file; do not replace it.",
+      `Before launching: ${spec.exportHint}`,
+      `${models.length} model${models.length === 1 ? "" : "s"}; ${degraded} omit context limits (the client applies its own defaults).`,
+    ]);
+  });
+}
+
+export const EXPORT_USAGE = USAGE;

src/cli/help.ts

@@ -169,6 +169,16 @@ const helpEntries: Record<string, HelpEntry> = {
     summary: "Manage OpenCodex admission API keys and inspect external endpoints.",
   },
   "api-key": { usage: "ocx api-key <list|create|remove> ...", summary: "Alias of ocx access key." },
+  export: {
+    usage: "ocx export --client <opencode|pi> [--json] [--out <path>] [--force]",
+    summary: "Print a client config (opencode, Pi) wired to the running proxy.",
+    details: [
+      "--json prints only the config JSON on stdout, so it is safe to redirect to a file.",
+      "--out <path> writes the config there and refuses to replace an existing file without --force.",
+      "The config never contains a key; it references the client's env var, which you export before launching.",
+      "The destination path is printed for merging by hand — ocx never writes your real client config.",
+    ],
+  },
   grok: { usage: "ocx grok <status|exclude|include|set|clear|apply> ...", summary: "Manage and apply the Grok Build model fence." },
   integration: { usage: "ocx integration <claude|grok> ...", summary: "Manage supported client integrations." },
   system: {
@@ -286,6 +296,7 @@ Usage:
   ocx agent <sub>             Subagents, injection, effort caps, and sidecars
   ocx observe <sub>           Logs, usage, storage, memory, and debug data
   ocx access <sub>            External API keys and endpoint information
+  ocx export --client <id>    Print an opencode/Pi config wired to the running proxy
   ocx grok <sub>              Grok Build model selection and apply
   ocx system <sub>            Runtime settings, startup, sync, and updates
   ocx config <sub>            Validated configuration show/get/set/import/export

src/cli/index.ts

@@ -1031,6 +1031,11 @@ switch (command) {
     process.exitCode = await handleAccessCommand(["key", ...args.slice(1)]);
     break;
   }
+  case "export": {
+    const { handleExportCommand } = await import("./export-command");
+    process.exitCode = await handleExportCommand(args.slice(1));
+    break;
+  }
   case "grok": {
     const { handleGrokCommand } = await import("./integrations");
     process.exitCode = await handleGrokCommand(args.slice(1));