diff --git a/apps/ai-game-creator-shell/src-tauri/resources/agc-skills/manifest.json b/apps/ai-game-creator-shell/src-tauri/resources/agc-skills/manifest.json
index 26790f360..6d4201d96 100644
--- a/apps/ai-game-creator-shell/src-tauri/resources/agc-skills/manifest.json
+++ b/apps/ai-game-creator-shell/src-tauri/resources/agc-skills/manifest.json
@@ -1,6 +1,6 @@
 {
   "schemaVersion": "agc-skill-pack.v1",
-  "version": "2026-08-26.23",
+  "version": "2026-08-26.24",
   "skills": [
     {
       "name": "agc-game-production-workflow",
@@ -63,7 +63,7 @@
         "agents/openai.yaml",
         "references/platform-art-contract.md"
       ],
-      "sha256": "c6329c6a3cbd17a237d042349d7fd8adcf240287ef56d23b49329923e976d534"
+      "sha256": "47ac742d9b88e5d6cd9833484ab212152578e58ae27f7add312fd1d78183385c"
     },
     {
       "name": "agc-web-game-development",
diff --git a/apps/ai-game-creator-shell/src-tauri/resources/agc-skills/taonier-art-assets/SKILL.md b/apps/ai-game-creator-shell/src-tauri/resources/agc-skills/taonier-art-assets/SKILL.md
index c5c036c2b..2c737d022 100644
--- a/apps/ai-game-creator-shell/src-tauri/resources/agc-skills/taonier-art-assets/SKILL.md
+++ b/apps/ai-game-creator-shell/src-tauri/resources/agc-skills/taonier-art-assets/SKILL.md
@@ -19,6 +19,12 @@ image, UI design image, or publication material; use `agc_edit_image` for an
 edit of an existing registered image; use `taonier_prepare_game_art` only for
 the complete game-art package and its canonical slices.
 
+With `agc_generate_image`, `kind="character"` and `kind="art-spritesheet"`
+generate the subject on a solid-colour background and automatically matte it
+away afterwards, producing transparent-background results; write the prompt
+for the subject only, never for a scene. `kind="image"` keeps the rendered
+frame without extra processing.
+
 When `agc_generate_image` is used with `kind="art-spritesheet"`, `sliceMode` is
 required and has no default, so decide it explicitly:
 
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_audit.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_audit.rs
index 6f8557a32..86416a42d 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_audit.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_codex_audit.rs
@@ -550,6 +550,8 @@ fn extract_mcp_arguments(root: &Path, tool: &str, arguments: &Value) -> Value {
         "agc_generate_image" => {
             copy_string(object, "kind", &mut out);
             copy_string(object, "sliceMode", &mut out);
+            copy_number(object, "sliceCount", &mut out);
+            copy_string(object, "screenColor", &mut out);
             copy_string(object, "aspectRatio", &mut out);
             copy_string(object, "imageSize", &mut out);
             copy_string(object, "assetName", &mut out);
@@ -1194,7 +1196,13 @@ mod tests {
             "item": {
                 "type": "mcpToolCall",
                 "tool": "agc_generate_image",
-                "arguments": { "prompt": prompt, "kind": "icon-spec" }
+                "arguments": {
+                    "prompt": prompt,
+                    "kind": "art-spritesheet",
+                    "sliceMode": "connected-components",
+                    "sliceCount": 8,
+                    "screenColor": "#CFEFFF"
+                }
             }
         }));
         audit.finish(true);
@@ -1205,6 +1213,8 @@ mod tests {
         let stored = item["arguments"]["prompt"].as_str().expect("prompt");
         assert_eq!(stored.chars().count(), DIRECT_CODEX_AUDIT_BRIEF_CHARS);
         assert_eq!(item["arguments"]["promptChars"], json!(5000));
+        assert_eq!(item["arguments"]["sliceCount"], json!(8));
+        assert_eq!(item["arguments"]["screenColor"], json!("#CFEFFF"));
         assert_eq!(
             item["arguments"]["promptSha256"],
             json!(sha256_hex("收".repeat(5000).as_bytes()))
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs
index 53b2e75bc..a5d978e6c 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_runtime/mod.rs
@@ -3394,6 +3394,7 @@ async fn generate_direct_taonier_art_asset_at(
         slice_mode: (asset_kind == "art-spritesheet").then(|| "connected-components".to_string()),
         grid_x: None,
         grid_y: None,
+        screen_color: None,
     };
     let runtime_context =
         direct_taonier_art_generation_runtime_context(root, output_path, asset_kind)?;
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tool_bridge.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tool_bridge.rs
index 07e640f0c..cc0dbd90a 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tool_bridge.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tool_bridge.rs
@@ -2244,12 +2244,48 @@ fn validate_generate_image_slice_declaration(
     }
     if slice_mode.is_some() || grid_x.is_some() || grid_y.is_some() || slice_count.is_some() {
         return Err(format!(
-            "工具参数 sliceMode/gridX/gridY 仅对 kind=art-spritesheet 生效，当前 kind={kind}"
+            "工具参数 sliceMode/gridX/gridY/sliceCount 仅对 kind=art-spritesheet 生效，当前 kind={kind}"
         ));
     }
     Ok(())
 }
 
+/// 抠图纯色背景只服务 character 与 art-spritesheet 链路；格式校验收口为
+/// `auto` 或 `#RRGGBB`（服务端另有支持色板，客户端不复制），`auto`/空串归一为
+/// None（服务端自动决策），hex 统一大写后透传。其它 kind 携带该字段直接拒绝，
+/// 避免服务端静默忽略造成“已生效”的误解。
+fn normalize_generate_image_screen_color(
+    arguments: &Value,
+    kind: &str,
+) -> Result<Option<String>, String> {
+    let Some(value) = arguments.get("screenColor") else {
+        return Ok(None);
+    };
+    if value.is_null() {
+        return Ok(None);
+    }
+    if !matches!(kind, "character" | "art-spritesheet") {
+        return Err(format!(
+            "工具参数 screenColor 仅对 kind=character 和 kind=art-spritesheet 生效，当前 kind={kind}"
+        ));
+    }
+    let raw = value
+        .as_str()
+        .ok_or_else(|| "工具参数 screenColor 必须是 auto 或 #RRGGBB".to_string())?
+        .trim();
+    if raw.is_empty() || raw.eq_ignore_ascii_case("auto") {
+        return Ok(None);
+    }
+    let normalized = raw.to_ascii_uppercase();
+    let valid = normalized.len() == 7
+        && normalized.starts_with('#')
+        && normalized[1..].chars().all(|c| c.is_ascii_hexdigit());
+    if !valid {
+        return Err("工具参数 screenColor 必须是 auto 或 #RRGGBB".to_string());
+    }
+    Ok(Some(normalized))
+}
+
 async fn bridge_generate_image(state: &DirectToolBridgeState, arguments: &Value) -> Value {
     let result = async {
         bridge_reject_unknown_fields(
@@ -2264,6 +2300,8 @@ async fn bridge_generate_image(state: &DirectToolBridgeState, arguments: &Value)
                 "sliceMode",
                 "gridX",
                 "gridY",
+                "sliceCount",
+                "screenColor",
             ],
         )?;
         enforce_project_permission_policy(&state.root, "canvas.asset_generate")?;
@@ -2343,13 +2381,25 @@ async fn bridge_generate_image(state: &DirectToolBridgeState, arguments: &Value)
         {
             return Err("工具参数 gridX/gridY 必须在 1 到 32 之间".to_string());
         }
+        let slice_count = arguments
+            .get("sliceCount")
+            .filter(|value| !value.is_null())
+            .map(|value| {
+                value
+                    .as_u64()
+                    .filter(|count| (1..=256).contains(count))
+                    .map(|count| count as usize)
+                    .ok_or_else(|| "工具参数 sliceCount 必须是 1 到 256 的整数".to_string())
+            })
+            .transpose()?;
         validate_generate_image_slice_declaration(
             kind.as_str(),
             slice_mode.as_deref(),
             grid_x,
             grid_y,
-            None,
+            slice_count,
         )?;
+        let screen_color = normalize_generate_image_screen_color(arguments, kind.as_str())?;
         let options = PlatformArtAssetGenerationOptions {
             output_path,
             aspect_ratio,
@@ -2357,10 +2407,11 @@ async fn bridge_generate_image(state: &DirectToolBridgeState, arguments: &Value)
             asset_kind: kind.clone(),
             asset_label: asset_name.clone(),
             replace_existing: false,
-            slice_count: None,
+            slice_count,
             slice_mode,
             grid_x,
             grid_y,
+            screen_color,
         };
         let _generation_guard = state.image_generation_gate.lock().await;
         let generated = with_direct_editor_api_credentials(
@@ -2884,9 +2935,71 @@ mod tests {
             wrong_kind.contains("仅对 kind=art-spritesheet 生效"),
             "{wrong_kind}"
         );
+        let wrong_kind_count =
+            validate_generate_image_slice_declaration("image", None, None, None, Some(8))
+                .expect_err("sliceCount-only violation must be rejected");
+        assert!(
+            wrong_kind_count.contains("sliceCount"),
+            "sliceCount-only violation must name sliceCount: {wrong_kind_count}"
+        );
         assert!(validate_generate_image_slice_declaration("image", None, None, None, None).is_ok());
     }
 
+    #[test]
+    fn generate_image_screen_color_is_normalized_and_kind_gated() {
+        // 省略与显式 null 等价，且不触发 kind 门禁。
+        assert_eq!(
+            normalize_generate_image_screen_color(&json!({}), "image").expect("omitted"),
+            None
+        );
+        assert_eq!(
+            normalize_generate_image_screen_color(&json!({"screenColor": null}), "image")
+                .expect("null"),
+            None
+        );
+        // auto 家族归一为 None（服务端自动决策），大小写与空白不敏感。
+        for raw in ["auto", "AUTO", " auto ", ""] {
+            assert_eq!(
+                normalize_generate_image_screen_color(&json!({"screenColor": raw}), "character")
+                    .expect("auto variants"),
+                None,
+                "{raw}"
+            );
+        }
+        // hex 统一大写透传；色板白名单由服务端权威校验，客户端只守格式。
+        assert_eq!(
+            normalize_generate_image_screen_color(&json!({"screenColor": "#cfefff"}), "character")
+                .expect("lowercase hex"),
+            Some("#CFEFFF".to_string())
+        );
+        assert_eq!(
+            normalize_generate_image_screen_color(
+                &json!({"screenColor": " #A0BBA0 "}),
+                "art-spritesheet"
+            )
+            .expect("padded hex"),
+            Some("#A0BBA0".to_string())
+        );
+        // 非 auto/非 hex、非字符串一律拒绝。
+        for bad in [json!("green"), json!("#GGGGGG"), json!("#FFF"), json!(12)] {
+            assert!(
+                normalize_generate_image_screen_color(&json!({"screenColor": bad}), "character")
+                    .is_err(),
+                "{bad}"
+            );
+        }
+        // 其它 kind 携带该字段直接拒绝，即使取值合法。
+        let gated =
+            normalize_generate_image_screen_color(&json!({"screenColor": "#CFEFFF"}), "image")
+                .expect_err("screenColor must stay scoped to character/art-spritesheet");
+        assert!(gated.contains("kind=character"), "{gated}");
+        assert!(normalize_generate_image_screen_color(
+            &json!({"screenColor": "auto"}),
+            "ui-prototype"
+        )
+        .is_err());
+    }
+
     #[test]
     fn remove_background_identity_preserves_default_and_distinguishes_options() {
         let legacy = "asset-1\0透明图";
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tools_mcp.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tools_mcp.rs
index 6cad047e7..f08ff2ef3 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tools_mcp.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/direct_tools_mcp.rs
@@ -233,7 +233,7 @@ fn direct_tools_mcp_specs_for(controlled_web_search: bool, _cocos_editor_availab
         }),
         json!({
                 "name": "agc_generate_image",
-                "description": "按原网站图片画布能力生成一张新图片：普通插画、角色立绘、统一视觉规范图、游戏 UI 设计图或透明游戏素材图集都可使用。仅在用户明确要求生成新图时调用；游戏美术包是另一个专用工具，不是本工具的限制。客户端负责登录态授权、计费、幂等账本、下载校验、manifest/revision 登记和本地预览，不需要用户提供 API Key、Token、URL 或 .env。",
+                "description": "按原网站图片画布能力生成一张新图片：普通插画、角色立绘、统一视觉规范图、游戏 UI 设计图或透明游戏素材图集都可使用。仅在用户明确要求生成新图时调用。",
                 "inputSchema": {
                     "type": "object",
                     "properties": {
@@ -247,7 +247,7 @@ fn direct_tools_mcp_specs_for(controlled_web_search: bool, _cocos_editor_availab
                             "type": "string",
                             "enum": PLATFORM_ART_ASSET_GENERATION_KINDS,
                             "default": "image",
-                            "description": "image=普通新图，character=角色图，spec/icon-spec=统一视觉规范图（spec 是服务端同义词，客户端统一登记为 icon-spec），ui-prototype=完整 UI 设计图，art-spritesheet=透明游戏素材图集（项目须已有 icon-spec 规范图），publication-material=发布宣传图"
+                            "description": "image=普通新图（不做额外处理），character=角色图（纯色底生成后自动抠图，产出透明背景立绘，prompt 只描述角色主体），spec/icon-spec=统一视觉规范图（spec 是服务端同义词，客户端统一登记为 icon-spec），ui-prototype=完整 UI 设计图，art-spritesheet=透明游戏素材图集（纯色底生成后自动抠图并切片，项目须已有 icon-spec 规范图），publication-material=发布宣传图"
                         },
                         "aspectRatio": {
                             "type": "string",
@@ -286,6 +286,16 @@ fn direct_tools_mcp_specs_for(controlled_web_search: bool, _cocos_editor_availab
                             "minimum": 1,
                             "maximum": 32,
                             "description": "grid 模式纵向网格数量，只能与 sliceMode=grid 同时提供"
+                        },
+                        "sliceCount": {
+                            "type": "integer",
+                            "minimum": 1,
+                            "maximum": 256,
+                            "description": "只与 kind=art-spritesheet 且 sliceMode=connected-components 同时提供，用于约束目标素材张数；省略时按图像内容自动识别"
+                        },
+                        "screenColor": {
+                            "type": "string",
+                            "description": "抠图纯色背景，仅 kind=character（角色形象）和 kind=art-spritesheet（图标素材）生效，其它 kind 携带会被拒绝。生成时把主体置于该纯色背景上，回图后据此抠除背景。取值只能是 auto 或下列色板 hex 之一，传值只填 hex 本身、不要附带色名：#CFEFFF（浅雾蓝）、#B0C2E0（浅钢蓝）、#FFD6C2（暖浅桃色）、#E6D8FF（淡薰衣草紫）、#F4D8E8（浅粉灰）、#7FB3FF（中度天蓝）、#FFF2A8（浅柠黄）、#CFFFE1（淡薄荷绿）、#D8DEE8（浅中性灰）、#D8D2E8（淡灰紫）、#A8F7F0（高对比浅青）、#A0BBA0（灰竹绿）；auto 时由服务端自动选色。手动指定时不能与角色或素材本体的颜色接近"
                         }
                     },
                     "required": ["prompt"],
@@ -1131,6 +1141,8 @@ async fn call_agc_generate_image(arguments: &Value) -> Value {
             "sliceMode",
             "gridX",
             "gridY",
+            "sliceCount",
+            "screenColor",
         ],
     ) {
         return mcp_tool_result(error, Vec::new(), true);
@@ -1159,6 +1171,7 @@ async fn call_agc_generate_image(arguments: &Value) -> Value {
         ("assetName", DIRECT_TOOLS_MCP_MAX_RESOURCE_NAME_CHARS),
         ("outputPath", 512),
         ("sliceMode", 32),
+        ("screenColor", 16),
     ] {
         if arguments.get(field).is_some() {
             if let Err(error) = bounded_tool_string(arguments, field, max_chars) {
@@ -2391,11 +2404,35 @@ mod tests {
         assert_eq!(image_tool["inputSchema"]["required"], json!(["prompt"]));
         assert!(image_tool["description"]
             .as_str()
-            .is_some_and(|description| description.contains("不是本工具的限制")));
+            .is_some_and(|description| description.contains("仅在用户明确要求生成新图时调用")));
+        assert!(
+            image_tool["inputSchema"]["properties"]["kind"]["description"]
+                .as_str()
+                .is_some_and(|description| description.contains("自动抠图")
+                    && description.contains("prompt 只描述角色主体")
+                    && description.contains("不做额外处理")),
+            "kind description must carry the auto-matting semantics"
+        );
         assert_eq!(
             image_tool["inputSchema"]["properties"]["sliceMode"]["enum"],
             json!(["connected-components", "grid"])
         );
+        assert_eq!(
+            image_tool["inputSchema"]["properties"]["sliceCount"]["minimum"],
+            json!(1)
+        );
+        assert_eq!(
+            image_tool["inputSchema"]["properties"]["sliceCount"]["maximum"],
+            json!(256)
+        );
+        assert!(
+            image_tool["inputSchema"]["properties"]["screenColor"]["description"]
+                .as_str()
+                .is_some_and(|description| description.contains("抠图纯色背景")
+                    && description.contains("kind=character")
+                    && description.contains("不要附带色名")),
+            "screenColor description must carry the matting-background semantics"
+        );
         assert!(
             image_tool["inputSchema"]["properties"]["sliceMode"]
                 .get("default")
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/generation/canvas_generation.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/generation/canvas_generation.rs
index 3863a7ee3..ae9420835 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/generation/canvas_generation.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/generation/canvas_generation.rs
@@ -420,6 +420,9 @@ pub(crate) struct PlatformArtAssetGenerationOptions {
     pub(crate) slice_mode: Option<String>,
     pub(crate) grid_x: Option<u32>,
     pub(crate) grid_y: Option<u32>,
+    /// 抠图纯色背景（auto/省略已归一为 None；Some 时是规范化后的大写 #RRGGBB）。
+    /// 仅 character 与 art-spritesheet 链路透传给服务端。
+    pub(crate) screen_color: Option<String>,
 }
 
 impl Default for PlatformArtAssetGenerationOptions {
@@ -435,6 +438,7 @@ impl Default for PlatformArtAssetGenerationOptions {
             slice_mode: None,
             grid_x: None,
             grid_y: None,
+            screen_color: None,
         }
     }
 }
@@ -2227,7 +2231,8 @@ pub(crate) async fn generate_platform_art_asset_with_required_slices_at(
 /// 动作，必须各自独立成槽，才能在同一项目里同时在途。
 ///
 /// 升级前遗留账本仍由旧材料函数定位；新请求把显式切分模式纳入身份，避免同一图集
-/// 请求在网格与连通域之间误复用。`slice_count` 继续保持历史兼容语义，不进身份。
+/// 请求在网格与连通域之间误复用。`slice_count` 与 `screen_color` 同样改变付费产出，
+/// 一并进入身份；None 时跳过序列化，未使用这些字段的请求身份与旧版逐字节一致。
 #[derive(Serialize)]
 #[serde(rename_all = "camelCase")]
 struct StandalonePlatformArtGenerationFingerprintMaterial<'a> {
@@ -2242,6 +2247,10 @@ struct StandalonePlatformArtGenerationFingerprintMaterial<'a> {
     slice_mode: Option<&'a str>,
     grid_x: Option<u32>,
     grid_y: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    slice_count: Option<usize>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    screen_color: Option<&'a str>,
 }
 
 /// 把输出路径收口成稳定的旧槽材料：空路径与未指定路径都落到 `(automatic-output)`，
@@ -2281,6 +2290,8 @@ fn standalone_platform_art_generation_runtime_context(
         slice_mode: options.slice_mode.as_deref(),
         grid_x: options.grid_x,
         grid_y: options.grid_y,
+        slice_count: options.slice_count,
+        screen_color: options.screen_color.as_deref(),
     })
     .map_err(|error| format!("序列化 standalone 图片生成动作身份失败：{error}"))?;
     let action_fingerprint = format!("{:x}", Sha256::digest(&identity_bytes));
@@ -2855,7 +2866,7 @@ pub(in crate::agent) async fn request_platform_art_asset_with_runtime_options_at
                     "sliceMode": options.slice_mode,
                     "gridX": options.grid_x,
                     "gridY": options.grid_y,
-                    "screenColor": "auto",
+                    "screenColor": options.screen_color.as_deref().unwrap_or("auto"),
                     "aspectRatio": options.aspect_ratio,
                     "imageSize": options.image_size,
                     "assetLabel": options.asset_label,
@@ -2903,6 +2914,14 @@ pub(in crate::agent) async fn request_platform_art_asset_with_runtime_options_at
                 if options.asset_kind == "image" {
                     object.remove("kind");
                 }
+                if options.asset_kind == "character" {
+                    if let Some(screen_color) = options.screen_color.as_deref() {
+                        object.insert(
+                            "screenColor".to_string(),
+                            serde_json::Value::String(screen_color.to_string()),
+                        );
+                    }
+                }
             }
             request_body
         } else {
@@ -8503,6 +8522,7 @@ mod canvas_generation_tests {
             slice_mode: None,
             grid_x: None,
             grid_y: None,
+            screen_color: None,
         };
         let ordinary =
             standalone_platform_art_generation_runtime_context("完整生成提示词", &options, false)
@@ -8569,6 +8589,12 @@ mod canvas_generation_tests {
         let mut changed = options.clone();
         changed.replace_existing = false;
         changed_options.push(changed);
+        let mut changed = options.clone();
+        changed.screen_color = Some("#CFEFFF".to_string());
+        changed_options.push(changed);
+        let mut changed = options.clone();
+        changed.slice_count = Some(8);
+        changed_options.push(changed);
         for changed in changed_options {
             let context = standalone_platform_art_generation_runtime_context(
                 "完整生成提示词",
@@ -10547,6 +10573,7 @@ mod canvas_generation_tests {
             slice_mode: None,
             grid_x: None,
             grid_y: None,
+            screen_color: None,
         };
         let prompt = "生成同一套整包美术";
         let generation_prompt = build_platform_art_asset_prompt(prompt, &[], &options);
@@ -11451,6 +11478,7 @@ mod canvas_generation_tests {
             slice_mode: None,
             grid_x: None,
             grid_y: None,
+            screen_color: None,
         };
         let prompt = "保持同一个生成提示词";
         let generation_prompt = build_platform_art_asset_prompt(prompt, &[], &options);
@@ -11915,6 +11943,7 @@ mod canvas_generation_tests {
             slice_mode: None,
             grid_x: None,
             grid_y: None,
+            screen_color: None,
         };
         let prompt = "恢复已受理视觉规范图";
         let generation_prompt = build_platform_art_asset_prompt(prompt, &[], &options);
@@ -12524,6 +12553,7 @@ mod canvas_generation_tests {
             slice_mode: Some("connected-components".to_string()),
             grid_x: None,
             grid_y: None,
+            screen_color: None,
         }
     }
 
diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools/media.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools/media.rs
index b9bb4ed76..d07a5735d 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools/media.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/runtime_tools/media.rs
@@ -599,6 +599,7 @@ pub(in crate::agent) async fn observe_agent_runtime_platform_art_asset_generatio
         slice_mode: (!slice_mode.trim().is_empty()).then_some(slice_mode.clone()),
         grid_x,
         grid_y,
+        screen_color: None,
     };
     if let Some(pending) = pending_action {
         match recover_persisted_visual_generation_options(
@@ -650,6 +651,7 @@ pub(in crate::agent) async fn observe_agent_runtime_platform_art_asset_generatio
                 .or_else(|| (!slice_mode.trim().is_empty()).then_some(slice_mode)),
             grid_x,
             grid_y,
+            screen_color: requested_options.screen_color,
         }
     };
     options.replace_existing = replace_existing;
diff --git a/apps/ai-game-creator-shell/src-tauri/src/commands.rs b/apps/ai-game-creator-shell/src-tauri/src/commands.rs
index 23fa3d93f..6da970aa6 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/commands.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/commands.rs
@@ -4936,6 +4936,7 @@ pub(crate) fn prepare_local_project_asset_generation(
                 .then(|| "connected-components".to_string()),
             grid_x: None,
             grid_y: None,
+            screen_color: None,
         },
     })
 }
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs
index 5f2fa67fa..8b2644286 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs
@@ -1114,6 +1114,7 @@ async fn canonical_art_spec_and_ui_requests_use_the_shared_reference_chain() {
             slice_mode: None,
             grid_x: None,
             grid_y: None,
+            screen_color: None,
         },
     )
     .await;
@@ -5642,6 +5643,7 @@ fn ui_prototype_generation_uses_dedicated_prompt_and_art_spec() {
         slice_mode: None,
         grid_x: None,
         grid_y: None,
+        screen_color: None,
     };
     let prompt = build_platform_art_asset_prompt(
         "原创网格贪吃蛇：分数与状态 HUD、四类不同分值食物、开始、方向键/WASD、触控方向键、失败与重开",
diff --git a/docs/technical/【技术方案】Direct回合行为审计账本-2026-08-31.md b/docs/technical/【技术方案】Direct回合行为审计账本-2026-08-31.md
index d8a570436..66a3adbda 100644
--- a/docs/technical/【技术方案】Direct回合行为审计账本-2026-08-31.md
+++ b/docs/technical/【技术方案】Direct回合行为审计账本-2026-08-31.md
@@ -185,7 +185,7 @@ camelCase JSON。禁止出现附件正文、命令 stdout、patch diff、宿主
 | `agc_list_project_files`        | `path`、`query`（120）、`kind`、`offset`、`limit`                                                                | 无                                                         |
 | `agc_write_file`                | `path`、`contentChars`（`content` 的字符数，不是正文）                                                           | 不落 `content`                                             |
 | `taonier_prepare_game_art`      | `mode`、`brief`（截断 4000）、`briefChars`、`briefSha256`                                                        | **要 brief 原文**（分析定玩法的吸烟枪；上限已是 MCP 合同） |
-| `agc_generate_image`            | `kind`、`aspectRatio`、`imageSize`、`assetName`、`outputPath`、`prompt` 截断 4000、`promptChars`、`promptSha256` | 不落 32k 全文                                              |
+| `agc_generate_image`            | `kind`、`sliceMode`、`sliceCount`、`screenColor`、`aspectRatio`、`imageSize`、`assetName`、`outputPath`、`prompt` 截断 4000、`promptChars`、`promptSha256` | 不落 32k 全文                                              |
 | `agc_edit_image`                | `sourceLocalAssetId`、`assetName`、`prompt` 截断 4000、`promptChars`、`promptSha256`                             | 同上                                                       |
 | `agc_create_or_derive_resource` | `kind`、`mode`、`sourceLocalAssetId`、`assetName`、`prompt` 截断 4000、`promptChars`、`promptSha256`             | MCP 上限已是 4000                                          |
 | `agc_list_registered_assets`    | `kind`、`assetId`、`includeSequenceFrames`、`offset`、`limit`                                                    | 无                                                         |