docs(openrouter-images): sync with openrouter-web changes

skills/openrouter-images/SKILL.md

@@ -103,6 +103,7 @@ Both `generate.ts` and `edit.ts` accept the same flags. Only pass parameters the
 | `--output-compression <n>` | Compression 0–100 for webp/jpeg | Model default |
 | `--n <count>` | Number of images to generate (1–10, provider permitting) | 1 |
 | `--seed <int>` | Seed for deterministic generation (where supported) | Random |
+| `--provider <json>` | Provider routing preferences (`only`, `order`, `ignore`, `sort`, `allow_fallbacks`) | None |
 | `--provider-options <json>` | Provider-specific passthrough, keyed by `provider_slug` | None |
 
 `--provider-options` takes a JSON object keyed by provider slug, using keys from that endpoint's `allowed_passthrough_parameters`:
@@ -113,6 +114,28 @@ cd <skill-path>/scripts && npx tsx generate.ts "a dramatic portrait" \
   --provider-options '{"black-forest-labs": {"steps": 40, "guidance": 3}}'
 ```
 
+### Provider Routing
+
+When a model has multiple providers, `--provider` controls which endpoints can serve the request via the request's `provider` object:
+
+| Field | Meaning |
+|---|---|
+| `only` | Allow only these provider slugs |
+| `order` | Try providers in this order |
+| `ignore` | Exclude these provider slugs |
+| `sort` | Sort eligible endpoints by `price`, `throughput`, or `latency` |
+| `allow_fallbacks` | When `false`, stop after the primary provider instead of trying another |
+
+Use the `provider_slug` values from `discover.ts <model>` as slugs:
+
+```bash
+cd <skill-path>/scripts && npx tsx generate.ts "a red panda astronaut" \
+  --model google/gemini-3.1-flash-image-preview \
+  --provider '{"only": ["google-ai-studio"], "allow_fallbacks": false}'
+```
+
+The response's `X-Provider-Name` header reports which provider served the request.
+
 ## Output Format
 
 ### generate.ts

skills/openrouter-images/scripts/edit.ts

@@ -21,7 +21,7 @@ if (!imagePath || !prompt) {
       "  [--aspect-ratio <r>] [--resolution <512|1K|2K|4K>] [--size <s>] [--n <count>]\n" +
       "  [--quality <auto|low|medium|high>] [--output-format <png|jpeg|webp|svg>]\n" +
       "  [--background <auto|transparent|opaque>] [--output-compression <n>] [--seed <int>]\n" +
-      "  [--provider-options '<json>']\n\n" +
+      "  [--provider '<json>'] [--provider-options '<json>']\n\n" +
       "Editing sends the source image as an image-to-image reference, so pick a model\n" +
       "whose input_modalities include \"image\". Run discover.ts <model> to check."
   );

skills/openrouter-images/scripts/generate.ts

@@ -18,7 +18,7 @@ if (!prompt) {
       "  [--aspect-ratio <r>] [--resolution <512|1K|2K|4K>] [--size <s>] [--n <count>]\n" +
       "  [--quality <auto|low|medium|high>] [--output-format <png|jpeg|webp|svg>]\n" +
       "  [--background <auto|transparent|opaque>] [--output-compression <n>] [--seed <int>]\n" +
-      "  [--provider-options '<json>']\n\n" +
+      "  [--provider '<json>'] [--provider-options '<json>']\n\n" +
       "Run discover.ts <model> first to see which parameters a model accepts."
   );
   process.exit(1);

skills/openrouter-images/scripts/lib.ts

@@ -190,25 +190,39 @@ export function buildImageParams(args: Map<string, string | true>): Record<strin
   setInt("seed", "seed");
   setInt("output-compression", "output_compression");
 
+  const provider: Record<string, unknown> = {};
+
+  const providerRouting = args.get("provider");
+  if (typeof providerRouting === "string") {
+    Object.assign(
+      provider,
+      parseJsonObject(providerRouting, "--provider must be a JSON object of routing preferences.")
+    );
+  }
+
   const providerOptions = args.get("provider-options");
   if (typeof providerOptions === "string") {
-    const parsed = parseProviderOptions(providerOptions);
-    params.provider = { options: parsed };
+    provider.options = parseJsonObject(
+      providerOptions,
+      "--provider-options must be a JSON object keyed by provider slug."
+    );
   }
 
+  if (Object.keys(provider).length > 0) params.provider = provider;
+
   return params;
 }
 
-function parseProviderOptions(raw: string): Record<string, unknown> {
+function parseJsonObject(raw: string, errorMessage: string): Record<string, unknown> {
   let parsed: unknown;
   try {
     parsed = JSON.parse(raw);
   } catch {
-    console.error("Error: --provider-options must be a JSON object keyed by provider slug.");
+    console.error(`Error: ${errorMessage}`);
     process.exit(1);
   }
   if (typeof parsed !== "object" || parsed === null || Array.isArray(parsed)) {
-    console.error("Error: --provider-options must be a JSON object keyed by provider slug.");
+    console.error(`Error: ${errorMessage}`);
     process.exit(1);
   }
   return parsed as Record<string, unknown>;