fix(skill-loader): discover skills from .agents/skills/ directory

Add discoverProjectAgentsSkills() for project-level .agents/skills/ and
discoverGlobalAgentsSkills() for ~/.agents/skills/ — matching OpenCode's
native skill discovery paths (https://opencode.ai/docs/skills/).

Updated discoverAllSkills(), discoverSkills(), and createSkillContext()
to include these new sources with correct priority ordering.

Co-authored-by: dtateks <dtateks@users.noreply.github.com>
Closes #1818

src/features/opencode-skill-loader/agents-skills-global.test.ts

@@ -0,0 +1,48 @@
+import { describe, it, expect, beforeEach, afterEach, mock } from "bun:test"
+import { mkdirSync, writeFileSync, rmSync } from "fs"
+import { join } from "path"
+import { tmpdir } from "os"
+
+const TEST_DIR = join(tmpdir(), "agents-global-skills-test-" + Date.now())
+const TEMP_HOME = join(TEST_DIR, "home")
+
+describe("discoverGlobalAgentsSkills", () => {
+  beforeEach(() => {
+    mkdirSync(TEST_DIR, { recursive: true })
+    mkdirSync(TEMP_HOME, { recursive: true })
+  })
+
+  afterEach(() => {
+    mock.restore()
+    rmSync(TEST_DIR, { recursive: true, force: true })
+  })
+
+  it("#given a skill in ~/.agents/skills/ #when discoverGlobalAgentsSkills is called #then it discovers the skill", async () => {
+    //#given
+    const skillContent = `---
+name: agent-global-skill
+description: A skill from global .agents/skills directory
+---
+Skill body.
+`
+    const agentsGlobalSkillsDir = join(TEMP_HOME, ".agents", "skills")
+    const skillDir = join(agentsGlobalSkillsDir, "agent-global-skill")
+    mkdirSync(skillDir, { recursive: true })
+    writeFileSync(join(skillDir, "SKILL.md"), skillContent)
+
+    mock.module("os", () => ({
+      homedir: () => TEMP_HOME,
+      tmpdir,
+    }))
+
+    //#when
+    const { discoverGlobalAgentsSkills } = await import("./loader")
+    const skills = await discoverGlobalAgentsSkills()
+    const skill = skills.find(s => s.name === "agent-global-skill")
+
+    //#then
+    expect(skill).toBeDefined()
+    expect(skill?.scope).toBe("user")
+    expect(skill?.definition.description).toContain("A skill from global .agents/skills directory")
+  })
+})

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

@@ -552,7 +552,7 @@ Skill body.
         expect(names.length).toBe(uniqueNames.length)
       } finally {
         process.chdir(originalCwd)
-        if (originalOpenCodeConfigDir === undefined) {
+         if (originalOpenCodeConfigDir === undefined) {
           delete process.env.OPENCODE_CONFIG_DIR
         } else {
           process.env.OPENCODE_CONFIG_DIR = originalOpenCodeConfigDir
@@ -560,4 +560,60 @@ Skill body.
       }
     })
   })
+
+  describe("agents skills discovery (.agents/skills/)", () => {
+    it("#given a skill in .agents/skills/ #when discoverProjectAgentsSkills is called #then it discovers the skill", async () => {
+      //#given
+      const skillContent = `---
+name: agent-project-skill
+description: A skill from project .agents/skills directory
+---
+Skill body.
+`
+      const agentsProjectSkillsDir = join(TEST_DIR, ".agents", "skills")
+      const skillDir = join(agentsProjectSkillsDir, "agent-project-skill")
+      mkdirSync(skillDir, { recursive: true })
+      writeFileSync(join(skillDir, "SKILL.md"), skillContent)
+
+      //#when
+      const { discoverProjectAgentsSkills } = await import("./loader")
+      const originalCwd = process.cwd()
+      process.chdir(TEST_DIR)
+
+      try {
+        const skills = await discoverProjectAgentsSkills()
+        const skill = skills.find(s => s.name === "agent-project-skill")
+
+        //#then
+        expect(skill).toBeDefined()
+        expect(skill?.scope).toBe("project")
+        expect(skill?.definition.description).toContain("A skill from project .agents/skills directory")
+      } finally {
+        process.chdir(originalCwd)
+      }
+    })
+
+    it("#given a skill in .agents/skills/ #when discoverProjectAgentsSkills is called with directory #then it discovers the skill", async () => {
+      //#given
+      const skillContent = `---
+name: agent-dir-skill
+description: A skill via explicit directory param
+---
+Skill body.
+`
+      const agentsProjectSkillsDir = join(TEST_DIR, ".agents", "skills")
+      const skillDir = join(agentsProjectSkillsDir, "agent-dir-skill")
+      mkdirSync(skillDir, { recursive: true })
+      writeFileSync(join(skillDir, "SKILL.md"), skillContent)
+
+      //#when
+      const { discoverProjectAgentsSkills } = await import("./loader")
+      const skills = await discoverProjectAgentsSkills(TEST_DIR)
+      const skill = skills.find(s => s.name === "agent-dir-skill")
+
+      //#then
+      expect(skill).toBeDefined()
+      expect(skill?.scope).toBe("project")
+    })
+  })
 })

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

@@ -1,4 +1,5 @@
 import { join } from "path"
+import { homedir } from "os"
 import { getClaudeConfigDir } from "../../shared/claude-config-dir"
 import { getOpenCodeConfigDir } from "../../shared/opencode-config-dir"
 import type { CommandDefinition } from "../claude-code-command-loader/types"
@@ -38,15 +39,25 @@ export interface DiscoverSkillsOptions {
 }
 
 export async function discoverAllSkills(directory?: string): Promise<LoadedSkill[]> {
-  const [opencodeProjectSkills, opencodeGlobalSkills, projectSkills, userSkills] = await Promise.all([
-    discoverOpencodeProjectSkills(directory),
-    discoverOpencodeGlobalSkills(),
-    discoverProjectClaudeSkills(directory),
-    discoverUserClaudeSkills(),
-  ])
+  const [opencodeProjectSkills, opencodeGlobalSkills, projectSkills, userSkills, agentsProjectSkills, agentsGlobalSkills] =
+    await Promise.all([
+      discoverOpencodeProjectSkills(directory),
+      discoverOpencodeGlobalSkills(),
+      discoverProjectClaudeSkills(directory),
+      discoverUserClaudeSkills(),
+      discoverProjectAgentsSkills(directory),
+      discoverGlobalAgentsSkills(),
+    ])
 
-  // Priority: opencode-project > opencode > project > user
-  return deduplicateSkillsByName([...opencodeProjectSkills, ...opencodeGlobalSkills, ...projectSkills, ...userSkills])
+  // Priority: opencode-project > opencode > project (.claude + .agents) > user (.claude + .agents)
+  return deduplicateSkillsByName([
+    ...opencodeProjectSkills,
+    ...opencodeGlobalSkills,
+    ...projectSkills,
+    ...agentsProjectSkills,
+    ...userSkills,
+    ...agentsGlobalSkills,
+  ])
 }
 
 export async function discoverSkills(options: DiscoverSkillsOptions = {}): Promise<LoadedSkill[]> {
@@ -62,13 +73,22 @@ export async function discoverSkills(options: DiscoverSkillsOptions = {}): Promi
     return deduplicateSkillsByName([...opencodeProjectSkills, ...opencodeGlobalSkills])
   }
 
-  const [projectSkills, userSkills] = await Promise.all([
+  const [projectSkills, userSkills, agentsProjectSkills, agentsGlobalSkills] = await Promise.all([
     discoverProjectClaudeSkills(directory),
     discoverUserClaudeSkills(),
+    discoverProjectAgentsSkills(directory),
+    discoverGlobalAgentsSkills(),
   ])
 
-  // Priority: opencode-project > opencode > project > user
-  return deduplicateSkillsByName([...opencodeProjectSkills, ...opencodeGlobalSkills, ...projectSkills, ...userSkills])
+  // Priority: opencode-project > opencode > project (.claude + .agents) > user (.claude + .agents)
+  return deduplicateSkillsByName([
+    ...opencodeProjectSkills,
+    ...opencodeGlobalSkills,
+    ...projectSkills,
+    ...agentsProjectSkills,
+    ...userSkills,
+    ...agentsGlobalSkills,
+  ])
 }
 
 export async function getSkillByName(name: string, options: DiscoverSkillsOptions = {}): Promise<LoadedSkill | undefined> {
@@ -96,3 +116,13 @@ export async function discoverOpencodeProjectSkills(directory?: string): Promise
   const opencodeProjectDir = join(directory ?? process.cwd(), ".opencode", "skills")
   return loadSkillsFromDir({ skillsDir: opencodeProjectDir, scope: "opencode-project" })
 }
+
+export async function discoverProjectAgentsSkills(directory?: string): Promise<LoadedSkill[]> {
+  const agentsProjectDir = join(directory ?? process.cwd(), ".agents", "skills")
+  return loadSkillsFromDir({ skillsDir: agentsProjectDir, scope: "project" })
+}
+
+export async function discoverGlobalAgentsSkills(): Promise<LoadedSkill[]> {
+  const agentsGlobalDir = join(homedir(), ".agents", "skills")
+  return loadSkillsFromDir({ skillsDir: agentsGlobalDir, scope: "user" })
+}