feat(skill): enable customize-opencode by default, link full schema (#26899)

packages/core/src/flag/flag.ts

@@ -1,5 +1,4 @@
 import { Config } from "effect"
-import { InstallationChannel } from "../installation/version"
 
 function truthy(key: string) {
   const value = process.env[key]?.toLowerCase()
@@ -11,13 +10,6 @@ function falsy(key: string) {
   return value === "false" || value === "0"
 }
 
-// Channels where new experiments default to ON (unstable / internal users).
-// Stable channels (`prod`, `latest`) stay opt-in.
-const UNSTABLE_CHANNELS = new Set(["dev", "beta", "local"])
-function unstableDefault(key: string) {
-  return truthy(key) || (!falsy(key) && UNSTABLE_CHANNELS.has(InstallationChannel))
-}
-
 function number(key: string) {
   const value = process.env[key]
   if (!value) return undefined
@@ -56,9 +48,6 @@ export const Flag = {
   OPENCODE_DISABLE_CLAUDE_CODE_PROMPT: OPENCODE_DISABLE_CLAUDE_CODE || truthy("OPENCODE_DISABLE_CLAUDE_CODE_PROMPT"),
   OPENCODE_DISABLE_CLAUDE_CODE_SKILLS,
   OPENCODE_DISABLE_EXTERNAL_SKILLS: truthy("OPENCODE_DISABLE_EXTERNAL_SKILLS"),
-  // Default-on for dev/beta/local; opt-in for stable. Set
-  // OPENCODE_EXPERIMENTAL_CUSTOMIZE_SKILL=false to force off, =true to force on.
-  OPENCODE_EXPERIMENTAL_CUSTOMIZE_SKILL: unstableDefault("OPENCODE_EXPERIMENTAL_CUSTOMIZE_SKILL"),
   OPENCODE_FAKE_VCS: process.env["OPENCODE_FAKE_VCS"],
   OPENCODE_SERVER_PASSWORD: process.env["OPENCODE_SERVER_PASSWORD"],
   OPENCODE_SERVER_USERNAME: process.env["OPENCODE_SERVER_USERNAME"],

packages/opencode/src/skill/index.ts

@@ -242,13 +242,11 @@ export const layer = Layer.effect(
         const s: State = { skills: {}, dirs: new Set() }
         // Register the built-in skill BEFORE disk discovery so a user-disk
         // skill with the same name can override it.
-        if (Flag.OPENCODE_EXPERIMENTAL_CUSTOMIZE_SKILL) {
+        s.skills[CUSTOMIZE_OPENCODE_SKILL_NAME] = {
-          s.skills[CUSTOMIZE_OPENCODE_SKILL_NAME] = {
+          name: CUSTOMIZE_OPENCODE_SKILL_NAME,
-            name: CUSTOMIZE_OPENCODE_SKILL_NAME,
+          description: CUSTOMIZE_OPENCODE_SKILL_DESCRIPTION,
-            description: CUSTOMIZE_OPENCODE_SKILL_DESCRIPTION,
+          location: "<built-in>",
-            location: "<built-in>",
+          content: CUSTOMIZE_OPENCODE_SKILL_BODY,
-            content: CUSTOMIZE_OPENCODE_SKILL_BODY,
-          }
         }
         yield* loadSkills(s, yield* InstanceState.get(discovered), bus)
         return s

packages/opencode/src/skill/prompt/customize-opencode.md

@@ -1,17 +1,39 @@
 <!--
   Built-in skill. Name and description are registered in code at
-  packages/opencode/src/skill/index.ts (see SKILL_NAME and SKILL_DESCRIPTION).
+  packages/opencode/src/skill/index.ts (see CUSTOMIZE_OPENCODE_SKILL_NAME
-  The body below becomes the skill's content.
+  and CUSTOMIZE_OPENCODE_SKILL_DESCRIPTION). The body below becomes the
+  skill's content.
 -->
 
 # Customizing opencode
 
 opencode validates its own config strictly and refuses to start when a field
-is wrong. The shapes below are the accepted shapes. When in doubt, fetch
+is wrong. The shapes below cover the common surface area, but they are a
-`https://opencode.ai/config.json` (the JSON Schema) and validate against it.
+**summary, not the source of truth**.
 
-Every `opencode.json` should declare `"$schema": "https://opencode.ai/config.json"`
+## Full schema reference
-so the user's editor catches mistakes as they type.
+
+The authoritative list of every config option — with field types, enums,
+defaults, and descriptions — lives in the published JSON Schema:
+
+**<https://opencode.ai/config.json>**
+
+If a field is not documented in this skill, or you need to confirm an exact
+shape before writing config, **fetch that URL and read the schema directly**
+rather than guessing. opencode hard-fails on invalid config, so the cost of a
+wrong shape is a broken startup.
+
+Independently, every `opencode.json` should declare
+`"$schema": "https://opencode.ai/config.json"` so the user's editor catches
+mistakes as they type.
+
+## Applying changes
+
+Config is loaded once when opencode starts and is not hot-reloaded. After
+saving changes to `opencode.json`, an agent file, a skill, a plugin, or any
+other config-time file, **tell the user to quit and restart opencode** for
+the changes to take effect. The running session will keep using the
+already-loaded config until then.
 
 ## Where files live
 
@@ -343,12 +365,13 @@ When a user's config is broken and opencode won't start, these env vars help:
 ## When proposing edits
 
 - Validate against the schema before writing. If you are unsure of a field's
-  exact shape, fetch `https://opencode.ai/config.json` rather than guessing.
+  exact shape, or the field is not covered in this skill, fetch
+  `https://opencode.ai/config.json` and read the schema rather than guessing.
 - Preserve `$schema` and any existing fields the user did not ask to change.
 - For agent, skill, and plugin definitions, prefer creating new files in the
   correct location over inlining everything in `opencode.json`.
 - If the user's existing config is malformed, point them at the env-var escape
-  hatch above so they can edit from inside opencode without breaking their
+  hatches above so they can edit from inside opencode without breaking their
   session.
-- opencode hard-fails on invalid config by design. There is no graceful
+- After saving any config change, remind the user to quit and restart opencode
-  degradation, so get the shape right the first time.
+  — running sessions keep using the already-loaded config.

packages/opencode/test/preload.ts

@@ -35,11 +35,6 @@ process.env["XDG_CONFIG_HOME"] = path.join(dir, "config")
 process.env["XDG_STATE_HOME"] = path.join(dir, "state")
 process.env["OPENCODE_MODELS_PATH"] = path.join(import.meta.dir, "tool", "fixtures", "models-api.json")
 process.env["OPENCODE_EXPERIMENTAL_EVENT_SYSTEM"] = "true"
-// Tests assert exact skill counts from disk discovery; the built-in
-// customize-opencode skill is opt-in for stable channels and on by default
-// for unstable channels (including "local" where CI runs). Disable it here
-// so disk-discovery tests aren't off-by-one.
-process.env["OPENCODE_EXPERIMENTAL_CUSTOMIZE_SKILL"] = "false"
 
 // Set test home directory to isolate tests from user's actual home directory
 // This prevents tests from picking up real user configs/skills from ~/.claude/skills

packages/opencode/test/skill/skill.test.ts

@@ -63,7 +63,7 @@ Instructions here.
           )
 
           const skill = yield* Skill.Service
-          const list = yield* skill.all()
+          const list = (yield* skill.all()).filter((s) => s.location !== "<built-in>")
           expect(list.length).toBe(1)
           const item = list.find((x) => x.name === "test-skill")
           expect(item).toBeDefined()
@@ -133,7 +133,7 @@ description: Second test skill.
           )
 
           const skill = yield* Skill.Service
-          const list = yield* skill.all()
+          const list = (yield* skill.all()).filter((s) => s.location !== "<built-in>")
           expect(list.length).toBe(2)
           expect(list.find((x) => x.name === "skill-one")).toBeDefined()
           expect(list.find((x) => x.name === "skill-two")).toBeDefined()
@@ -157,7 +157,7 @@ Just some content without YAML frontmatter.
           )
 
           const skill = yield* Skill.Service
-          expect(yield* skill.all()).toEqual([])
+          expect((yield* skill.all()).filter((s) => s.location !== "<built-in>")).toEqual([])
         }),
       { git: true },
     ),
@@ -182,7 +182,7 @@ Instructions here.
           )
 
           const skill = yield* Skill.Service
-          const list = yield* skill.all()
+          const list = (yield* skill.all()).filter((s) => s.location !== "<built-in>")
           expect(list.length).toBe(1)
           const item = list.find((x) => x.name === "manual-skill")
           expect(item).toBeDefined()
@@ -212,7 +212,7 @@ description: A skill in the .claude/skills directory.
           )
 
           const skill = yield* Skill.Service
-          const list = yield* skill.all()
+          const list = (yield* skill.all()).filter((s) => s.location !== "<built-in>")
           expect(list.length).toBe(1)
           const item = list.find((x) => x.name === "claude-skill")
           expect(item).toBeDefined()
@@ -235,7 +235,7 @@ description: A skill in the .claude/skills directory.
           yield* Effect.promise(() => createGlobalSkill(tmp.path))
           yield* Effect.gen(function* () {
             const skill = yield* Skill.Service
-            const list = yield* skill.all()
+            const list = (yield* skill.all()).filter((s) => s.location !== "<built-in>")
             expect(list.length).toBe(1)
             expect(list[0].name).toBe("global-test-skill")
             expect(list[0].description).toBe("A global skill from ~/.claude/skills for testing.")
@@ -251,7 +251,7 @@ description: A skill in the .claude/skills directory.
       () =>
         Effect.gen(function* () {
           const skill = yield* Skill.Service
-          expect(yield* skill.all()).toEqual([])
+          expect((yield* skill.all()).filter((s) => s.location !== "<built-in>")).toEqual([])
         }),
       { git: true },
     ),
@@ -275,7 +275,7 @@ description: A skill in the .agents/skills directory.
           )
 
           const skill = yield* Skill.Service
-          const list = yield* skill.all()
+          const list = (yield* skill.all()).filter((s) => s.location !== "<built-in>")
           expect(list.length).toBe(1)
           const item = list.find((x) => x.name === "agent-skill")
           expect(item).toBeDefined()
@@ -314,7 +314,7 @@ This skill is loaded from the global home directory.
 
           yield* Effect.gen(function* () {
             const skill = yield* Skill.Service
-            const list = yield* skill.all()
+            const list = (yield* skill.all()).filter((s) => s.location !== "<built-in>")
             expect(list.length).toBe(1)
             expect(list[0].name).toBe("global-agent-skill")
             expect(list[0].description).toBe("A global skill from ~/.agents/skills for testing.")
@@ -355,7 +355,7 @@ description: A skill in the .agents/skills directory.
           )
 
           const skill = yield* Skill.Service
-          const list = yield* skill.all()
+          const list = (yield* skill.all()).filter((s) => s.location !== "<built-in>")
           expect(list.length).toBe(2)
           expect(list.find((x) => x.name === "claude-skill")).toBeDefined()
           expect(list.find((x) => x.name === "agent-skill")).toBeDefined()