feat: add opencode-skill-loader with 4-source priority system (#331)

* feat: add opencode-skill-loader with 4-source priority system

- Create new opencode-skill-loader feature module independent from Claude Code
- Support 4 source paths with priority: opencode-project > project > opencode > user
  - .opencode/skill/ (opencode-project)
  - .claude/skills/ (project)
  - ~/.config/opencode/skill/ (opencode)
  - ~/.claude/skills/ (user)
- Support both SKILL.md and {SKILLNAME}.md file patterns
- Maintain path awareness for file references (@path syntax)

* feat: integrate opencode-skill-loader into main plugin

- Import and use new skill loader functions
- Load skills from all 4 sources and merge into config.command
- Also merge pluginComponents.skills (previously loaded but never used)

* feat: add skill discovery to slashcommand tool

- Import and use discoverAllSkills from opencode-skill-loader
- Display skills alongside commands in tool description and execution
- Update formatCommandList to handle combined commands and skills

* refactor: remove old claude-code-skill-loader

- Delete src/features/claude-code-skill-loader/ directory (was never integrated into main plugin)
- Update plugin loader import to use new opencode-skill-loader types

* docs: update AGENTS.md for new skill loader

- Update structure to show opencode-skill-loader instead of claude-code-skill-loader
- Update Skills priority order to include all 4 sources

---------

Co-authored-by: sisyphus-dev-ai <sisyphus-dev-ai@users.noreply.github.com>

src/features/AGENTS.md

@@ -19,7 +19,7 @@ features/
 │   └── env-expander.ts         # ${VAR} expansion
 ├── claude-code-plugin-loader/  # Load external plugins from installed_plugins.json
 ├── claude-code-session-state/  # Session state persistence
-├── claude-code-skill-loader/   # Load skills from ~/.claude/skills/*/SKILL.md
+├── opencode-skill-loader/      # Load skills from OpenCode and Claude paths
 └── hook-message-injector/      # Inject messages into conversation
 ```
 
@@ -30,7 +30,7 @@ Each loader reads from multiple directories (highest priority first):
 | Loader | Priority Order |
 |--------|---------------|
 | Commands | `.opencode/command/` > `~/.config/opencode/command/` > `.claude/commands/` > `~/.claude/commands/` |
-| Skills | `.claude/skills/` > `~/.claude/skills/` |
+| Skills | `.opencode/skill/` > `~/.config/opencode/skill/` > `.claude/skills/` > `~/.claude/skills/` |
 | Agents | `.claude/agents/` > `~/.claude/agents/` |
 | MCPs | `.claude/.mcp.json` > `.mcp.json` > `~/.claude/.mcp.json` |
 

src/features/claude-code-plugin-loader/loader.ts

@@ -9,7 +9,7 @@ import { log } from "../../shared/logger"
 import { expandEnvVarsInObject } from "../claude-code-mcp-loader/env-expander"
 import { transformMcpServer } from "../claude-code-mcp-loader/transformer"
 import type { CommandDefinition, CommandFrontmatter } from "../claude-code-command-loader/types"
-import type { SkillMetadata } from "../claude-code-skill-loader/types"
+import type { SkillMetadata } from "../opencode-skill-loader/types"
 import type { AgentFrontmatter } from "../claude-code-agent-loader/types"
 import type { ClaudeCodeMcpConfig, McpServerConfig } from "../claude-code-mcp-loader/types"
 import type {

src/features/claude-code-skill-loader/loader.ts

@@ -1,86 +0,0 @@
-import { existsSync, readdirSync, readFileSync } from "fs"
-import { join } from "path"
-import { parseFrontmatter } from "../../shared/frontmatter"
-import { sanitizeModelField } from "../../shared/model-sanitizer"
-import { resolveSymlink } from "../../shared/file-utils"
-import { getClaudeConfigDir } from "../../shared"
-import type { CommandDefinition } from "../claude-code-command-loader/types"
-import type { SkillScope, SkillMetadata, LoadedSkillAsCommand } from "./types"
-
-function loadSkillsFromDir(skillsDir: string, scope: SkillScope): LoadedSkillAsCommand[] {
-  if (!existsSync(skillsDir)) {
-    return []
-  }
-
-  const entries = readdirSync(skillsDir, { withFileTypes: true })
-  const skills: LoadedSkillAsCommand[] = []
-
-  for (const entry of entries) {
-    if (entry.name.startsWith(".")) continue
-
-    const skillPath = join(skillsDir, entry.name)
-
-    if (!entry.isDirectory() && !entry.isSymbolicLink()) continue
-
-    const resolvedPath = resolveSymlink(skillPath)
-
-    const skillMdPath = join(resolvedPath, "SKILL.md")
-    if (!existsSync(skillMdPath)) continue
-
-    try {
-      const content = readFileSync(skillMdPath, "utf-8")
-      const { data, body } = parseFrontmatter<SkillMetadata>(content)
-
-      const skillName = data.name || entry.name
-      const originalDescription = data.description || ""
-      const formattedDescription = `(${scope} - Skill) ${originalDescription}`
-
-      const wrappedTemplate = `<skill-instruction>
-Base directory for this skill: ${resolvedPath}/
-File references (@path) in this skill are relative to this directory.
-
-${body.trim()}
-</skill-instruction>
-
-<user-request>
-$ARGUMENTS
-</user-request>`
-
-      const definition: CommandDefinition = {
-        name: skillName,
-        description: formattedDescription,
-        template: wrappedTemplate,
-        model: sanitizeModelField(data.model),
-      }
-
-      skills.push({
-        name: skillName,
-        path: resolvedPath,
-        definition,
-        scope,
-      })
-    } catch {
-      continue
-    }
-  }
-
-  return skills
-}
-
-export function loadUserSkillsAsCommands(): Record<string, CommandDefinition> {
-  const userSkillsDir = join(getClaudeConfigDir(), "skills")
-  const skills = loadSkillsFromDir(userSkillsDir, "user")
-  return skills.reduce((acc, skill) => {
-    acc[skill.name] = skill.definition
-    return acc
-  }, {} as Record<string, CommandDefinition>)
-}
-
-export function loadProjectSkillsAsCommands(): Record<string, CommandDefinition> {
-  const projectSkillsDir = join(process.cwd(), ".claude", "skills")
-  const skills = loadSkillsFromDir(projectSkillsDir, "project")
-  return skills.reduce((acc, skill) => {
-    acc[skill.name] = skill.definition
-    return acc
-  }, {} as Record<string, CommandDefinition>)
-}

src/features/claude-code-skill-loader/types.ts

@@ -1,16 +0,0 @@
-import type { CommandDefinition } from "../claude-code-command-loader/types"
-
-export type SkillScope = "user" | "project"
-
-export interface SkillMetadata {
-  name: string
-  description: string
-  model?: string
-}
-
-export interface LoadedSkillAsCommand {
-  name: string
-  path: string
-  definition: CommandDefinition
-  scope: SkillScope
-}

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

@@ -0,0 +1,179 @@
+import { existsSync, readdirSync, readFileSync } from "fs"
+import { join, basename, dirname } from "path"
+import { homedir } from "os"
+import { parseFrontmatter } from "../../shared/frontmatter"
+import { sanitizeModelField } from "../../shared/model-sanitizer"
+import { resolveSymlink, isMarkdownFile } from "../../shared/file-utils"
+import { getClaudeConfigDir } from "../../shared"
+import type { CommandDefinition } from "../claude-code-command-loader/types"
+import type { SkillScope, SkillMetadata, LoadedSkill } from "./types"
+
+/**
+ * Load a skill from a markdown file path.
+ * 
+ * @param skillPath - Path to the skill file (SKILL.md or {name}.md)
+ * @param resolvedPath - Directory for file reference resolution (@path references)
+ * @param defaultName - Fallback name if not specified in frontmatter
+ * @param scope - Source scope for priority ordering
+ */
+function loadSkillFromPath(
+  skillPath: string,
+  resolvedPath: string,
+  defaultName: string,
+  scope: SkillScope
+): LoadedSkill | null {
+  try {
+    const content = readFileSync(skillPath, "utf-8")
+    const { data, body } = parseFrontmatter<SkillMetadata>(content)
+
+    const skillName = data.name || defaultName
+    const originalDescription = data.description || ""
+    const isOpencodeSource = scope === "opencode" || scope === "opencode-project"
+    const formattedDescription = `(${scope} - Skill) ${originalDescription}`
+
+    const wrappedTemplate = `<skill-instruction>
+Base directory for this skill: ${resolvedPath}/
+File references (@path) in this skill are relative to this directory.
+
+${body.trim()}
+</skill-instruction>
+
+<user-request>
+$ARGUMENTS
+</user-request>`
+
+    const definition: CommandDefinition = {
+      name: skillName,
+      description: formattedDescription,
+      template: wrappedTemplate,
+      model: sanitizeModelField(data.model, isOpencodeSource ? "opencode" : "claude-code"),
+      agent: data.agent,
+      subtask: data.subtask,
+      argumentHint: data["argument-hint"],
+    }
+
+    return {
+      name: skillName,
+      path: skillPath,
+      resolvedPath,
+      definition,
+      scope,
+    }
+  } catch {
+    return null
+  }
+}
+
+/**
+ * Load skills from a directory, supporting BOTH patterns:
+ * - Directory with SKILL.md: skill-name/SKILL.md
+ * - Directory with {SKILLNAME}.md: skill-name/{SKILLNAME}.md
+ * - Direct markdown file: skill-name.md
+ */
+function loadSkillsFromDir(skillsDir: string, scope: SkillScope): LoadedSkill[] {
+  if (!existsSync(skillsDir)) {
+    return []
+  }
+
+  const entries = readdirSync(skillsDir, { withFileTypes: true })
+  const skills: LoadedSkill[] = []
+
+  for (const entry of entries) {
+    if (entry.name.startsWith(".")) continue
+
+    const entryPath = join(skillsDir, entry.name)
+
+    if (entry.isDirectory() || entry.isSymbolicLink()) {
+      const resolvedPath = resolveSymlink(entryPath)
+      const dirName = entry.name
+
+      const skillMdPath = join(resolvedPath, "SKILL.md")
+      if (existsSync(skillMdPath)) {
+        const skill = loadSkillFromPath(skillMdPath, resolvedPath, dirName, scope)
+        if (skill) skills.push(skill)
+        continue
+      }
+
+      const namedSkillMdPath = join(resolvedPath, `${dirName}.md`)
+      if (existsSync(namedSkillMdPath)) {
+        const skill = loadSkillFromPath(namedSkillMdPath, resolvedPath, dirName, scope)
+        if (skill) skills.push(skill)
+        continue
+      }
+
+      continue
+    }
+
+    if (isMarkdownFile(entry)) {
+      const skillName = basename(entry.name, ".md")
+      const skill = loadSkillFromPath(entryPath, skillsDir, skillName, scope)
+      if (skill) skills.push(skill)
+    }
+  }
+
+  return skills
+}
+
+function skillsToRecord(skills: LoadedSkill[]): Record<string, CommandDefinition> {
+  const result: Record<string, CommandDefinition> = {}
+  for (const skill of skills) {
+    result[skill.name] = skill.definition
+  }
+  return result
+}
+
+/**
+ * Load skills from Claude Code user directory (~/.claude/skills/)
+ */
+export function loadUserSkills(): Record<string, CommandDefinition> {
+  const userSkillsDir = join(getClaudeConfigDir(), "skills")
+  const skills = loadSkillsFromDir(userSkillsDir, "user")
+  return skillsToRecord(skills)
+}
+
+/**
+ * Load skills from Claude Code project directory (.claude/skills/)
+ */
+export function loadProjectSkills(): Record<string, CommandDefinition> {
+  const projectSkillsDir = join(process.cwd(), ".claude", "skills")
+  const skills = loadSkillsFromDir(projectSkillsDir, "project")
+  return skillsToRecord(skills)
+}
+
+/**
+ * Load skills from OpenCode global directory (~/.config/opencode/skill/)
+ */
+export function loadOpencodeGlobalSkills(): Record<string, CommandDefinition> {
+  const opencodeSkillsDir = join(homedir(), ".config", "opencode", "skill")
+  const skills = loadSkillsFromDir(opencodeSkillsDir, "opencode")
+  return skillsToRecord(skills)
+}
+
+/**
+ * Load skills from OpenCode project directory (.opencode/skill/)
+ */
+export function loadOpencodeProjectSkills(): Record<string, CommandDefinition> {
+  const opencodeProjectDir = join(process.cwd(), ".opencode", "skill")
+  const skills = loadSkillsFromDir(opencodeProjectDir, "opencode-project")
+  return skillsToRecord(skills)
+}
+
+/**
+ * Discover all skills from all sources with priority ordering.
+ * Priority order: opencode-project > project > opencode > user
+ * 
+ * @returns Array of LoadedSkill objects for use in slashcommand discovery
+ */
+export function discoverAllSkills(): LoadedSkill[] {
+  const opencodeProjectDir = join(process.cwd(), ".opencode", "skill")
+  const projectDir = join(process.cwd(), ".claude", "skills")
+  const opencodeGlobalDir = join(homedir(), ".config", "opencode", "skill")
+  const userDir = join(getClaudeConfigDir(), "skills")
+
+  const opencodeProjectSkills = loadSkillsFromDir(opencodeProjectDir, "opencode-project")
+  const projectSkills = loadSkillsFromDir(projectDir, "project")
+  const opencodeGlobalSkills = loadSkillsFromDir(opencodeGlobalDir, "opencode")
+  const userSkills = loadSkillsFromDir(userDir, "user")
+
+  return [...opencodeProjectSkills, ...projectSkills, ...opencodeGlobalSkills, ...userSkills]
+}

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

@@ -0,0 +1,20 @@
+import type { CommandDefinition } from "../claude-code-command-loader/types"
+
+export type SkillScope = "user" | "project" | "opencode" | "opencode-project"
+
+export interface SkillMetadata {
+  name?: string
+  description?: string
+  model?: string
+  "argument-hint"?: string
+  agent?: string
+  subtask?: boolean
+}
+
+export interface LoadedSkill {
+  name: string
+  path: string
+  resolvedPath: string
+  definition: CommandDefinition
+  scope: SkillScope
+}

src/index.ts

@@ -33,6 +33,12 @@ import {
   loadOpencodeProjectCommands,
 } from "./features/claude-code-command-loader";
 import { loadBuiltinCommands } from "./features/builtin-commands";
+import {
+  loadUserSkills,
+  loadProjectSkills,
+  loadOpencodeGlobalSkills,
+  loadOpencodeProjectSkills,
+} from "./features/opencode-skill-loader";
 
 import {
   loadUserAgents,
@@ -523,14 +529,25 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
       const systemCommands = config.command ?? {};
       const projectCommands = (pluginConfig.claude_code?.commands ?? true) ? loadProjectCommands() : {};
       const opencodeProjectCommands = loadOpencodeProjectCommands();
+
+      const userSkills = (pluginConfig.claude_code?.skills ?? true) ? loadUserSkills() : {};
+      const projectSkills = (pluginConfig.claude_code?.skills ?? true) ? loadProjectSkills() : {};
+      const opencodeGlobalSkills = loadOpencodeGlobalSkills();
+      const opencodeProjectSkills = loadOpencodeProjectSkills();
+
       config.command = {
         ...builtinCommands,
         ...userCommands,
+        ...userSkills,
         ...opencodeGlobalCommands,
+        ...opencodeGlobalSkills,
         ...systemCommands,
         ...projectCommands,
+        ...projectSkills,
         ...opencodeProjectCommands,
+        ...opencodeProjectSkills,
         ...pluginComponents.commands,
+        ...pluginComponents.skills,
       };
     },
 

src/tools/slashcommand/tools.ts

@@ -4,6 +4,7 @@ import { join, basename, dirname } from "path"
 import { parseFrontmatter, resolveCommandsInText, resolveFileReferencesInText, sanitizeModelField } from "../../shared"
 import { isMarkdownFile } from "../../shared/file-utils"
 import { getClaudeConfigDir } from "../../shared"
+import { discoverAllSkills, type LoadedSkill } from "../../features/opencode-skill-loader"
 import type { CommandScope, CommandMetadata, CommandInfo } from "./types"
 
 function discoverCommandsFromDir(commandsDir: string, scope: CommandScope): CommandInfo[] {
@@ -64,8 +65,30 @@ function discoverCommandsSync(): CommandInfo[] {
   return [...opencodeProjectCommands, ...projectCommands, ...opencodeGlobalCommands, ...userCommands]
 }
 
+function skillToCommandInfo(skill: LoadedSkill): CommandInfo {
+  return {
+    name: skill.name,
+    path: skill.path,
+    metadata: {
+      name: skill.name,
+      description: skill.definition.description || "",
+      argumentHint: skill.definition.argumentHint,
+      model: skill.definition.model,
+      agent: skill.definition.agent,
+      subtask: skill.definition.subtask,
+    },
+    content: skill.definition.template,
+    scope: skill.scope,
+  }
+}
+
 const availableCommands = discoverCommandsSync()
-const commandListForDescription = availableCommands
+const availableSkills = discoverAllSkills()
+const availableItems = [
+  ...availableCommands,
+  ...availableSkills.map(skillToCommandInfo),
+]
+const commandListForDescription = availableItems
   .map((cmd) => {
     const hint = cmd.metadata.argumentHint ? ` ${cmd.metadata.argumentHint}` : ""
     return `- /${cmd.name}${hint}: ${cmd.metadata.description} (${cmd.scope})`
@@ -109,21 +132,21 @@ async function formatLoadedCommand(cmd: CommandInfo): Promise<string> {
   return sections.join("\n")
 }
 
-function formatCommandList(commands: CommandInfo[]): string {
-  if (commands.length === 0) {
-    return "No commands found."
+function formatCommandList(items: CommandInfo[]): string {
+  if (items.length === 0) {
+    return "No commands or skills found."
   }
 
-  const lines = ["# Available Commands\n"]
+  const lines = ["# Available Commands & Skills\n"]
 
-  for (const cmd of commands) {
+  for (const cmd of items) {
     const hint = cmd.metadata.argumentHint ? ` ${cmd.metadata.argumentHint}` : ""
     lines.push(
       `- **/${cmd.name}${hint}**: ${cmd.metadata.description || "(no description)"} (${cmd.scope})`
     )
   }
 
-  lines.push(`\n**Total**: ${commands.length} commands`)
+  lines.push(`\n**Total**: ${items.length} items`)
   return lines.join("\n")
 }
 
@@ -148,7 +171,13 @@ Commands are loaded from (priority order, highest wins):
 - ~/.config/opencode/command/ (opencode - OpenCode global commands)
 - $CLAUDE_CONFIG_DIR/commands/ or ~/.claude/commands/ (user - Claude Code global commands)
 
-Each command is a markdown file with:
+Skills are loaded from (priority order, highest wins):
+- .opencode/skill/ (opencode-project - OpenCode project-specific skills)
+- ./.claude/skills/ (project - Claude Code project-specific skills)
+- ~/.config/opencode/skill/ (opencode - OpenCode global skills)
+- $CLAUDE_CONFIG_DIR/skills/ or ~/.claude/skills/ (user - Claude Code global skills)
+
+Each command/skill is a markdown file with:
 - YAML frontmatter: description, argument-hint, model, agent, subtask (optional)
 - Markdown body: The command instructions/prompt
 - File references: @path/to/file (relative to command file location)
@@ -167,14 +196,19 @@ ${commandListForDescription}`,
 
   async execute(args) {
     const commands = discoverCommandsSync()
+    const skills = discoverAllSkills()
+    const allItems = [
+      ...commands,
+      ...skills.map(skillToCommandInfo),
+    ]
 
     if (!args.command) {
-      return formatCommandList(commands) + "\n\nProvide a command name to execute."
+      return formatCommandList(allItems) + "\n\nProvide a command or skill name to execute."
     }
 
     const cmdName = args.command.replace(/^\//, "")
 
-    const exactMatch = commands.find(
+    const exactMatch = allItems.find(
       (cmd) => cmd.name.toLowerCase() === cmdName.toLowerCase()
     )
 
@@ -182,7 +216,7 @@ ${commandListForDescription}`,
       return await formatLoadedCommand(exactMatch)
     }
 
-    const partialMatches = commands.filter((cmd) =>
+    const partialMatches = allItems.filter((cmd) =>
       cmd.name.toLowerCase().includes(cmdName.toLowerCase())
     )
 
@@ -190,14 +224,14 @@ ${commandListForDescription}`,
       const matchList = partialMatches.map((cmd) => `/${cmd.name}`).join(", ")
       return (
         `No exact match for "/${cmdName}". Did you mean: ${matchList}?\n\n` +
-        formatCommandList(commands)
+        formatCommandList(allItems)
       )
     }
 
     return (
-      `Command "/${cmdName}" not found.\n\n` +
-      formatCommandList(commands) +
-      "\n\nTry a different command name."
+      `Command or skill "/${cmdName}" not found.\n\n` +
+      formatCommandList(allItems) +
+      "\n\nTry a different name."
     )
   },
 })