feat(skill-loader): support mcp.json file for AmpCode compatibility

- Added loadMcpJsonFromDir() to load MCP config from skill directory's mcp.json
- Supports AmpCode format (mcpServers wrapper) and direct format
- mcp.json takes priority over YAML frontmatter when both exist
- Added 3 tests covering mcpServers format, priority, and direct format

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/features/opencode-skill-loader/loader.test.ts

@@ -6,11 +6,14 @@ import { tmpdir } from "os"
 const TEST_DIR = join(tmpdir(), "skill-loader-test-" + Date.now())
 const SKILLS_DIR = join(TEST_DIR, ".opencode", "skill")
 
-function createTestSkill(name: string, content: string): string {
+function createTestSkill(name: string, content: string, mcpJson?: object): string {
   const skillDir = join(SKILLS_DIR, name)
   mkdirSync(skillDir, { recursive: true })
   const skillPath = join(skillDir, "SKILL.md")
   writeFileSync(skillPath, content)
+  if (mcpJson) {
+    writeFileSync(join(skillDir, "mcp.json"), JSON.stringify(mcpJson, null, 2))
+  }
   return skillDir
 }
 
@@ -157,4 +160,114 @@ Skill body.
       }
     })
   })
+
+  describe("mcp.json file loading (AmpCode compat)", () => {
+    it("loads MCP config from mcp.json with mcpServers format", async () => {
+      // #given
+      const skillContent = `---
+name: ampcode-skill
+description: Skill with mcp.json
+---
+Skill body.
+`
+      const mcpJson = {
+        mcpServers: {
+          playwright: {
+            command: "npx",
+            args: ["@playwright/mcp@latest"]
+          }
+        }
+      }
+      createTestSkill("ampcode-skill", skillContent, mcpJson)
+
+      // #when
+      const { discoverSkills } = await import("./loader")
+      const originalCwd = process.cwd()
+      process.chdir(TEST_DIR)
+
+      try {
+        const skills = discoverSkills({ includeClaudeCodePaths: false })
+        const skill = skills.find(s => s.name === "ampcode-skill")
+
+        // #then
+        expect(skill).toBeDefined()
+        expect(skill?.mcpConfig).toBeDefined()
+        expect(skill?.mcpConfig?.playwright).toBeDefined()
+        expect(skill?.mcpConfig?.playwright?.command).toBe("npx")
+        expect(skill?.mcpConfig?.playwright?.args).toEqual(["@playwright/mcp@latest"])
+      } finally {
+        process.chdir(originalCwd)
+      }
+    })
+
+    it("mcp.json takes priority over YAML frontmatter", async () => {
+      // #given
+      const skillContent = `---
+name: priority-skill
+mcp:
+  from-yaml:
+    command: yaml-cmd
+    args: [yaml-arg]
+---
+Skill body.
+`
+      const mcpJson = {
+        mcpServers: {
+          "from-json": {
+            command: "json-cmd",
+            args: ["json-arg"]
+          }
+        }
+      }
+      createTestSkill("priority-skill", skillContent, mcpJson)
+
+      // #when
+      const { discoverSkills } = await import("./loader")
+      const originalCwd = process.cwd()
+      process.chdir(TEST_DIR)
+
+      try {
+        const skills = discoverSkills({ includeClaudeCodePaths: false })
+        const skill = skills.find(s => s.name === "priority-skill")
+
+        // #then - mcp.json should take priority
+        expect(skill?.mcpConfig?.["from-json"]).toBeDefined()
+        expect(skill?.mcpConfig?.["from-yaml"]).toBeUndefined()
+      } finally {
+        process.chdir(originalCwd)
+      }
+    })
+
+    it("supports direct format without mcpServers wrapper", async () => {
+      // #given
+      const skillContent = `---
+name: direct-format
+---
+Skill body.
+`
+      const mcpJson = {
+        sqlite: {
+          command: "uvx",
+          args: ["mcp-server-sqlite"]
+        }
+      }
+      createTestSkill("direct-format", skillContent, mcpJson)
+
+      // #when
+      const { discoverSkills } = await import("./loader")
+      const originalCwd = process.cwd()
+      process.chdir(TEST_DIR)
+
+      try {
+        const skills = discoverSkills({ includeClaudeCodePaths: false })
+        const skill = skills.find(s => s.name === "direct-format")
+
+        // #then
+        expect(skill?.mcpConfig?.sqlite).toBeDefined()
+        expect(skill?.mcpConfig?.sqlite?.command).toBe("uvx")
+      } finally {
+        process.chdir(originalCwd)
+      }
+    })
+  })
 })

src/features/opencode-skill-loader/loader.ts

@@ -10,7 +10,7 @@ import type { CommandDefinition } from "../claude-code-command-loader/types"
 import type { SkillScope, SkillMetadata, LoadedSkill } from "./types"
 import type { SkillMcpConfig } from "../skill-mcp-manager/types"
 
-function parseSkillMcpConfig(content: string): SkillMcpConfig | undefined {
+function parseSkillMcpConfigFromFrontmatter(content: string): SkillMcpConfig | undefined {
   const frontmatterMatch = content.match(/^---\r?\n([\s\S]*?)\r?\n---/)
   if (!frontmatterMatch) return undefined
 
@@ -25,6 +25,34 @@ function parseSkillMcpConfig(content: string): SkillMcpConfig | undefined {
   return undefined
 }
 
+function loadMcpJsonFromDir(skillDir: string): SkillMcpConfig | undefined {
+  const mcpJsonPath = join(skillDir, "mcp.json")
+  if (!existsSync(mcpJsonPath)) return undefined
+
+  try {
+    const content = readFileSync(mcpJsonPath, "utf-8")
+    const parsed = JSON.parse(content) as Record<string, unknown>
+    
+    // AmpCode format: { "mcpServers": { "name": { ... } } }
+    if (parsed && typeof parsed === "object" && "mcpServers" in parsed && parsed.mcpServers) {
+      return parsed.mcpServers as SkillMcpConfig
+    }
+    
+    // Also support direct format: { "name": { command: ..., args: ... } }
+    if (parsed && typeof parsed === "object" && !("mcpServers" in parsed)) {
+      const hasCommandField = Object.values(parsed).some(
+        (v) => v && typeof v === "object" && "command" in (v as Record<string, unknown>)
+      )
+      if (hasCommandField) {
+        return parsed as SkillMcpConfig
+      }
+    }
+  } catch {
+    return undefined
+  }
+  return undefined
+}
+
 function parseAllowedTools(allowedTools: string | undefined): string[] | undefined {
   if (!allowedTools) return undefined
   return allowedTools.split(/\s+/).filter(Boolean)
@@ -39,7 +67,9 @@ function loadSkillFromPath(
   try {
     const content = readFileSync(skillPath, "utf-8")
     const { data, body } = parseFrontmatter<SkillMetadata>(content)
-    const mcpConfig = parseSkillMcpConfig(content)
+    const frontmatterMcp = parseSkillMcpConfigFromFrontmatter(content)
+    const mcpJsonMcp = loadMcpJsonFromDir(resolvedPath)
+    const mcpConfig = mcpJsonMcp || frontmatterMcp
 
     const skillName = data.name || defaultName
     const originalDescription = data.description || ""