Add Volcengine Jimeng (即梦 AI) video provider with V4 signing

.env.example

@@ -32,6 +32,8 @@ SUNO_API_KEY=                # Suno AI music generation (full songs, instrumenta
 # --- Video Generation ---
 HEYGEN_API_KEY=              # HeyGen API (VEO, Sora, Runway, Kling, Seedance via single key)
 RUNWAY_API_KEY=              # Runway Gen-4 (direct API, alternative to fal.ai routing)
+VOLC_ACCESSKEY=              # Volcengine Jimeng (即梦 AI) video generation via official API (HMAC-SHA256 V4 signing)
+VOLC_SECRETKEY=             # Secret Access Key paired with VOLC_ACCESSKEY. Get both at https://console.volcengine.com/iam/keymanage
 VIDEO_GEN_LOCAL_ENABLED=     # Set to "true" for local video gen (needs GPU + diffusers)
 VIDEO_GEN_LOCAL_MODEL=       # Local model: wan2.1-1.3b, wan2.1-14b, hunyuan-1.5, ltx2-local, cogvideo-5b
 MODAL_LTX2_ENDPOINT_URL=    # Modal self-hosted LTX-2 endpoint (optional)

docs/PROVIDERS.md

@@ -95,6 +95,44 @@ OpenMontage now uses those published rates in the Grok tool estimators.
 
 ---
 
+### Volcengine Jimeng — 即梦 AI Video Generation
+
+> **Direct ByteDance API via V4 signing.** Calls the Volcengine visual API (visual.volcengineapi.com) with HMAC-SHA256 request signing using IAM AK/SK credentials. Supports text-to-video and image-to-video via Jimeng 3.0 Pro.
+
+**Tools unlocked:** `jimeng_video`
+**Env vars:** `VOLC_ACCESSKEY` (Access Key ID) + `VOLC_SECRETKEY` (Secret Access Key)
+
+#### Setup
+
+1. Go to [console.volcengine.com/iam/keymanage](https://console.volcengine.com/iam/keymanage)
+2. Create a Volcengine account if you don't have one
+3. Create an Access Key pair (AK + SK)
+4. Ensure your account has access to Jimeng AI (即梦) video generation service
+5. Add to `.env`: `VOLC_ACCESSKEY=...` and `VOLC_SECRETKEY=...`
+
+#### What it's best for
+
+- Direct ByteDance/Volcengine API quota usage
+- Jimeng 3.0 Pro text-to-video and image-to-video
+- Chinese-language prompt understanding
+- Configurable frame count (121=5s, 241=10s) and aspect ratio
+
+#### API notes
+
+Authentication uses Volcengine IAM V4 signing (HMAC-SHA256), not a Bearer token. The signing process builds a canonical request, derives a signing key from SK → date → region → service, and signs the request.
+
+API flow: `POST ?Action=CVSync2AsyncSubmitTask` → poll `POST ?Action=CVSync2AsyncGetResult` → download `video_url`.
+
+The `req_key` for video is `jimeng_ti2v_v30_pro`. Success code is `10000`. Task statuses: `in_queue`, `generating`, `done`, `not_found`, `expired`.
+
+#### Pricing
+
+| Model | Price |
+|------|-------|
+| Jimeng 3.0 Pro (video) | ~$0.05/sec (check Volcengine console for actual rate) |
+
+---
+
 ### Alibaba DashScope — Qwen Image + TTS + ASR
 
 > **Best for Chinese-language production.** One key unlocks Qwen-Image generation, Qwen-TTS Mandarin narration, and Qwen-ASR with word-level timestamps — the only DashScope path that provides word-level granularity for subtitle alignment.

tests/contracts/test_jimeng_video.py

@@ -0,0 +1,320 @@
+"""Contract tests for the Volcengine Jimeng video provider tool.
+
+These tests verify that the tool satisfies the BaseTool contract without
+requiring real Volcengine AK/SK credentials or making any API calls.
+
+Run: pytest tests/contracts/test_jimeng_video.py -v
+"""
+
+import pytest
+
+from tools.base_tool import (
+    BaseTool,
+    Determinism,
+    ExecutionMode,
+    ToolRuntime,
+    ToolStability,
+    ToolStatus,
+    ToolTier,
+)
+from tools.video.jimeng_video import JimengVideo
+
+
+# ------------------------------------------------------------------
+# Contract compliance
+# ------------------------------------------------------------------
+
+class TestContract:
+
+    def test_inherits_base_tool(self):
+        assert issubclass(JimengVideo, BaseTool)
+
+    def test_has_required_identity(self):
+        tool = JimengVideo()
+        assert tool.name == "jimeng_video"
+        assert tool.version
+        assert tool.provider == "volcengine"
+        assert tool.capability == "video_generation"
+        assert tool.tier == ToolTier.GENERATE
+        assert tool.stability == ToolStability.EXPERIMENTAL
+        assert tool.runtime == ToolRuntime.API
+
+    def test_execution_mode_is_async(self):
+        assert JimengVideo().execution_mode == ExecutionMode.ASYNC
+
+    def test_has_input_schema(self):
+        schema = JimengVideo().input_schema
+        assert schema.get("type") == "object"
+        props = schema.get("properties", {})
+        required = schema.get("required", [])
+        assert required == ["prompt"]
+        for field in required:
+            assert field in props
+
+    def test_has_capabilities(self):
+        tool = JimengVideo()
+        assert "text_to_video" in tool.capabilities
+        assert "image_to_video" in tool.capabilities
+
+    def test_has_agent_skills(self):
+        assert "ai-video-gen" in JimengVideo().agent_skills
+
+    def test_has_fallbacks(self):
+        tool = JimengVideo()
+        assert "minimax_video" in tool.fallback_tools
+        assert "kling_video" in tool.fallback_tools
+
+    def test_has_install_instructions(self):
+        tool = JimengVideo()
+        assert "VOLC_ACCESSKEY" in tool.install_instructions
+        assert "VOLC_SECRETKEY" in tool.install_instructions
+
+    def test_get_info_returns_dict(self):
+        info = JimengVideo().get_info()
+        assert isinstance(info, dict)
+        assert info["name"] == "jimeng_video"
+        assert info["provider"] == "volcengine"
+        assert info["runtime"] == "api"
+
+    def test_status_unavailable_without_keys(self, monkeypatch):
+        monkeypatch.delenv("VOLC_ACCESSKEY", raising=False)
+        monkeypatch.delenv("VOLC_SECRETKEY", raising=False)
+        assert JimengVideo().get_status() == ToolStatus.UNAVAILABLE
+
+    def test_status_available_with_keys(self, monkeypatch):
+        monkeypatch.setenv("VOLC_ACCESSKEY", "fake-ak")
+        monkeypatch.setenv("VOLC_SECRETKEY", "fake-sk")
+        assert JimengVideo().get_status() == ToolStatus.AVAILABLE
+
+    def test_status_unavailable_with_only_ak(self, monkeypatch):
+        monkeypatch.setenv("VOLC_ACCESSKEY", "fake-ak")
+        monkeypatch.delenv("VOLC_SECRETKEY", raising=False)
+        assert JimengVideo().get_status() == ToolStatus.UNAVAILABLE
+
+    def test_has_resource_profile(self):
+        rp = JimengVideo().resource_profile
+        assert rp.network_required is True
+        assert rp.vram_mb == 0
+
+    def test_has_retry_policy(self):
+        assert JimengVideo().retry_policy.max_retries >= 0
+
+    def test_has_side_effects(self):
+        side = JimengVideo().side_effects
+        assert len(side) > 0
+        assert any("API" in s for s in side)
+
+    def test_has_user_visible_verification(self):
+        assert len(JimengVideo().user_visible_verification) > 0
+
+    def test_lazy_imports_requests(self):
+        import importlib
+        import sys
+        mod_name = "tools.video.jimeng_video"
+        if "requests" in sys.modules:
+            del sys.modules["requests"]
+        importlib.reload(sys.modules[mod_name])
+
+    def test_estimate_cost_returns_float(self):
+        cost = JimengVideo().estimate_cost({"prompt": "x", "frames": 121})
+        assert isinstance(cost, float)
+        assert cost > 0.0
+
+    def test_dry_run_returns_dict(self):
+        result = JimengVideo().dry_run({"prompt": "test"})
+        assert isinstance(result, dict)
+        assert result["tool"] == "jimeng_video"
+
+
+# ------------------------------------------------------------------
+# Idempotency keys
+# ------------------------------------------------------------------
+
+class TestIdempotencyKeys:
+
+    def test_includes_all_output_affecting_fields(self):
+        fields = JimengVideo().idempotency_key_fields
+        for field in ("prompt", "operation", "image_url", "frames", "aspect_ratio", "seed"):
+            assert field in fields, f"missing idempotency field: {field}"
+
+    def test_excludes_execution_only_fields(self):
+        fields = JimengVideo().idempotency_key_fields
+        for field in ("output_path", "poll_interval_seconds", "timeout_seconds"):
+            assert field not in fields
+
+    def test_differs_on_frames(self):
+        tool = JimengVideo()
+        base = {"prompt": "x"}
+        assert tool.idempotency_key(base) != tool.idempotency_key({**base, "frames": 241})
+
+    def test_differs_on_aspect_ratio(self):
+        tool = JimengVideo()
+        base = {"prompt": "x"}
+        assert tool.idempotency_key({**base, "aspect_ratio": "16:9"}) != tool.idempotency_key(
+            {**base, "aspect_ratio": "9:16"}
+        )
+
+    def test_differs_on_seed(self):
+        tool = JimengVideo()
+        base = {"prompt": "x"}
+        assert tool.idempotency_key({**base, "seed": -1}) != tool.idempotency_key(
+            {**base, "seed": 42}
+        )
+
+    def test_differs_on_image_url(self):
+        tool = JimengVideo()
+        base = {"prompt": "x", "operation": "image_to_video"}
+        assert tool.idempotency_key(base) != tool.idempotency_key(
+            {**base, "image_url": "https://example.com/img.png"}
+        )
+
+
+# ------------------------------------------------------------------
+# Tool-specific behavior
+# ------------------------------------------------------------------
+
+class TestToolSpecific:
+
+    def test_default_frames_is_121(self):
+        tool = JimengVideo()
+        assert tool.input_schema["properties"]["frames"]["default"] == 121
+
+    def test_default_aspect_ratio_is_16_9(self):
+        tool = JimengVideo()
+        assert tool.input_schema["properties"]["aspect_ratio"]["default"] == "16:9"
+
+    def test_default_seed_is_negative_one(self):
+        tool = JimengVideo()
+        assert tool.input_schema["properties"]["seed"]["default"] == -1
+
+    def test_cost_scales_with_frames(self):
+        tool = JimengVideo()
+        cost_5s = tool.estimate_cost({"prompt": "x", "frames": 121})
+        cost_10s = tool.estimate_cost({"prompt": "x", "frames": 241})
+        assert cost_10s > cost_5s
+
+    def test_build_payload_t2v(self):
+        tool = JimengVideo()
+        payload = tool._build_payload({"prompt": "a cat"})
+        assert payload["req_key"] == "jimeng_ti2v_v30_pro"
+        assert payload["prompt"] == "a cat"
+        assert payload["frames"] == 121
+        assert payload["aspect_ratio"] == "16:9"
+        assert payload["seed"] == -1
+        assert "image_urls" not in payload
+
+    def test_build_payload_i2v_includes_image(self):
+        tool = JimengVideo()
+        payload = tool._build_payload({
+            "prompt": "motion",
+            "operation": "image_to_video",
+            "image_url": "https://example.com/img.png",
+        })
+        assert payload["image_urls"] == ["https://example.com/img.png"]
+
+    def test_build_payload_t2v_omits_image(self):
+        tool = JimengVideo()
+        payload = tool._build_payload({"prompt": "a cat", "operation": "text_to_video"})
+        assert "image_urls" not in payload
+
+    def test_i2v_without_image_fails(self, monkeypatch):
+        monkeypatch.setenv("VOLC_ACCESSKEY", "fake-ak")
+        monkeypatch.setenv("VOLC_SECRETKEY", "fake-sk")
+        result = JimengVideo().execute({"prompt": "test", "operation": "image_to_video"})
+        assert result.success is False
+        assert "image_url" in result.error
+
+    def test_no_keys_returns_error(self, monkeypatch):
+        monkeypatch.delenv("VOLC_ACCESSKEY", raising=False)
+        monkeypatch.delenv("VOLC_SECRETKEY", raising=False)
+        result = JimengVideo().execute({"prompt": "test"})
+        assert result.success is False
+        assert "VOLC_ACCESSKEY" in result.error
+        assert "VOLC_SECRETKEY" in result.error
+
+    def test_safe_error_redacts_keys(self, monkeypatch):
+        monkeypatch.setenv("VOLC_ACCESSKEY", "my-ak-secret")
+        monkeypatch.setenv("VOLC_SECRETKEY", "my-sk-secret")
+        redacted = JimengVideo._safe_error(
+            Exception("failed with ak=my-ak-secret sk=my-sk-secret")
+        )
+        assert "my-ak-secret" not in redacted
+        assert "my-sk-secret" not in redacted
+        assert "[redacted]" in redacted
+
+    def test_safe_error_no_empty_string_bug(self, monkeypatch):
+        """Regression: when no keys are set, _safe_error must not mangle."""
+        monkeypatch.delenv("VOLC_ACCESSKEY", raising=False)
+        monkeypatch.delenv("VOLC_SECRETKEY", raising=False)
+        msg = JimengVideo._safe_error(Exception("abc"))
+        assert msg == "abc"
+
+    def test_sign_returns_authorization_header(self):
+        headers = JimengVideo._sign(
+            "POST", "/",
+            {"Action": "CVSync2AsyncSubmitTask", "Version": "2022-08-31"},
+            {}, b'{"prompt":"test"}',
+            "fake-ak", "fake-sk",
+        )
+        assert "Authorization" in headers
+        assert "HMAC-SHA256" in headers["Authorization"]
+        assert "fake-ak" in headers["Authorization"]
+        assert "Host" in headers
+        assert "X-Date" in headers
+        assert "X-Content-Sha256" in headers
+
+    def test_sign_includes_content_type(self):
+        headers = JimengVideo._sign("POST", "/", {}, {}, b"{}", "ak", "sk")
+        assert headers["Content-Type"] == "application/json"
+
+    def test_json_or_raise_returns_dict(self):
+        class FakeResp:
+            status_code = 200
+            def json(self):
+                return {"code": 10000, "data": {"task_id": "123"}}
+        assert JimengVideo._json_or_raise(FakeResp()) == {"code": 10000, "data": {"task_id": "123"}}
+
+    def test_json_or_raise_raises_on_non_json(self):
+        class FakeResp:
+            status_code = 500
+            def json(self):
+                raise ValueError("not JSON")
+        with pytest.raises(RuntimeError, match="Non-JSON"):
+            JimengVideo._json_or_raise(FakeResp())
+
+    def test_check_code_passes_on_success(self):
+        JimengVideo._check_code(200, {"code": 10000, "message": "Success"})
+
+    def test_check_code_raises_on_api_error(self):
+        with pytest.raises(RuntimeError, match="code=10008"):
+            JimengVideo._check_code(200, {"code": 10008, "message": "Insufficient balance"})
+
+    def test_check_code_raises_on_http_error(self):
+        with pytest.raises(RuntimeError, match="HTTP 401"):
+            JimengVideo._check_code(401, {"code": 10004, "message": "Auth failed"})
+
+    def test_check_code_defaults_to_success_when_code_missing(self):
+        """If code field is absent on HTTP 2xx, default to 10000 (success)."""
+        JimengVideo._check_code(200, {"data": {"task_id": "123"}})
+
+
+# ------------------------------------------------------------------
+# Registry discovery
+# ------------------------------------------------------------------
+
+class TestRegistryDiscovery:
+
+    def test_discoverable(self):
+        from tools.tool_registry import ToolRegistry
+        registry = ToolRegistry()
+        registry.discover()
+        names = {t.name for t in registry._tools.values()}
+        assert "jimeng_video" in names
+
+    def test_distinct_from_other_minimax_tools(self):
+        from tools.tool_registry import ToolRegistry
+        registry = ToolRegistry()
+        registry.discover()
+        jimeng = [t for t in registry._tools.values() if t.name == "jimeng_video"]
+        assert len(jimeng) == 1
+        assert jimeng[0].provider == "volcengine"