diff --git a/packages/core/src/config/normalize.ts b/packages/core/src/config/normalize.ts
index caec9d4df3..6356bf71d8 100644
--- a/packages/core/src/config/normalize.ts
+++ b/packages/core/src/config/normalize.ts
@@ -793,7 +793,7 @@ function isPlainRecord(value: unknown): value is Record<string, unknown> {
 }
 
 function own(value: Record<string, unknown>, key: string) {
-  return Object.prototype.hasOwnProperty.call(value, key)
+  return Object.hasOwn(value, key)
 }
 
 function setOwn(value: Record<string, unknown>, key: string, item: unknown) {
diff --git a/packages/core/src/config/plugin/agent.ts b/packages/core/src/config/plugin/agent.ts
index 6723b9368e..e2f3fe3216 100644
--- a/packages/core/src/config/plugin/agent.ts
+++ b/packages/core/src/config/plugin/agent.ts
@@ -157,8 +157,7 @@ function isPathAction(action: string): action is PathAction {
 }
 
 function expandHome(resource: string, home: string) {
-  if (resource === "~") return home
-  if (resource === "$HOME") return home
+  if (resource === "~" || resource === "$HOME") return home
   const relative = resource.startsWith("~/")
     ? resource.slice(2)
     : resource.startsWith("$HOME/") || resource.startsWith("$HOME\\")
diff --git a/packages/core/src/config/variable.ts b/packages/core/src/config/variable.ts
index 2825f5b1f9..15128128d1 100644
--- a/packages/core/src/config/variable.ts
+++ b/packages/core/src/config/variable.ts
@@ -37,11 +37,10 @@ const substituteFiles = Effect.fnUntraced(function* (input: SubstituteInput, tex
   const fs = yield* FSUtil.Service
   const configDir = input.type === "path" ? path.dirname(input.path) : input.dir
   const configSource = input.type === "path" ? input.path : input.source
-  const matches = Array.from(text.matchAll(/\{file:[^}]+\}/g))
   let out = ""
   let cursor = 0
 
-  for (const match of matches) {
+  for (const match of text.matchAll(/\{file:[^}]+\}/g)) {
     const token = match[0]
     const index = match.index
     out += text.slice(cursor, index)
@@ -54,7 +53,7 @@ const substituteFiles = Effect.fnUntraced(function* (input: SubstituteInput, tex
       continue
     }
 
-    const filePath = token.replace(/^\{file:/, "").replace(/\}$/, "")
+    const filePath = token.slice("{file:".length, -1)
     const expandedPath = filePath.startsWith("~/") ? path.join(os.homedir(), filePath.slice(2)) : filePath
     const resolvedPath = path.isAbsolute(expandedPath) ? expandedPath : path.resolve(configDir, expandedPath)
     const fileContent = yield* fs.readFileString(resolvedPath).pipe(
diff --git a/packages/core/src/skill.ts b/packages/core/src/skill.ts
index 2d017d2e67..54c394a10f 100644
--- a/packages/core/src/skill.ts
+++ b/packages/core/src/skill.ts
@@ -19,7 +19,7 @@ export const EmbeddedSource = Skill.EmbeddedSource
 export type EmbeddedSource = Skill.EmbeddedSource
 
 export const Source = Skill.Source
-export type Source = typeof Source.Type
+export type Source = Skill.Source
 
 export const Info = Skill.Info
 export type Info = Skill.Info
diff --git a/packages/core/src/skill/instructions.ts b/packages/core/src/skill/instructions.ts
index ae4808f2fd..fbfafbee20 100644
--- a/packages/core/src/skill/instructions.ts
+++ b/packages/core/src/skill/instructions.ts
@@ -72,8 +72,7 @@ const layer = Layer.effect(
       load: Effect.fn("SkillInstructions.load")(function* (selection) {
         const agent = selection.info
         if (!agent) return Instructions.empty
-        const permitted = Skill.available(yield* skills.list(), agent)
-        const available = permitted
+        const available = Skill.available(yield* skills.list(), agent)
           .flatMap((skill) =>
             skill.description === undefined || skill.autoinvoke === false
               ? []
diff --git a/packages/core/src/wellknown.ts b/packages/core/src/wellknown.ts
index 9659883085..39c3207828 100644
--- a/packages/core/src/wellknown.ts
+++ b/packages/core/src/wellknown.ts
@@ -180,9 +180,9 @@ const layer = Layer.effect(
           }),
         )
       }),
-      resolve: Effect.fn("WellKnown.resolveEntry")(function* (entry, variables) {
-        return yield* resolveEntry(entry, variables).pipe(Effect.provideService(HttpClient.HttpClient, http))
-      }),
+      resolve: Effect.fn("WellKnown.resolveEntry")((entry, variables) =>
+        resolveEntry(entry, variables).pipe(Effect.provideService(HttpClient.HttpClient, http)),
+      ),
     })
   }),
 )