diff --git a/go/go.mod b/go/go.mod
index 7a82af3..519b284 100644
--- a/go/go.mod
+++ b/go/go.mod
@@ -4,7 +4,6 @@ go 1.26.2
 
 require (
 	dappco.re/go/io v0.9.0
-	dappco.re/go/log v0.9.0
 	dappco.re/go/process v0.10.0
 	dappco.re/go/rag v0.10.0
 	dappco.re/go/ws v0.5.0
@@ -15,6 +14,7 @@ require (
 )
 
 require (
+	dappco.re/go/log v0.9.0 // indirect
 	github.com/bahlo/generic-list-go v0.2.0 // indirect
 	github.com/buger/jsonparser v1.1.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
diff --git a/go/pkg/mcp/agentic/coreio_compat.go b/go/pkg/mcp/agentic/coreio_compat.go
index 1b47eeb..e7b09f2 100644
--- a/go/pkg/mcp/agentic/coreio_compat.go
+++ b/go/pkg/mcp/agentic/coreio_compat.go
@@ -14,30 +14,19 @@ var coreio = struct {
 	Local: &localCoreFS{fs: (&core.Fs{}).New("/")},
 }
 
-func localCoreFSErr(
-	r core.Result,
-) (
-	_ error, // result
-) {
-	if r.OK {
-		return nil
-	}
-	if err, ok := r.Value.(error); ok && err != nil {
-		return err
-	}
-	if r.Value != nil {
-		return core.E("localCoreFS", core.Sprint(r.Value), nil)
-	}
-	return core.E("localCoreFS", "operation failed", nil)
-}
-
 func (l *localCoreFS) Read(path string) (
 	string,
 	error,
 ) {
 	r := l.fs.Read(path)
 	if !r.OK {
-		return "", localCoreFSErr(r)
+		if err, ok := r.Value.(error); ok && err != nil {
+			return "", err
+		}
+		if r.Value != nil {
+			return "", core.E("localCoreFS", core.Sprint(r.Value), nil)
+		}
+		return "", core.E("localCoreFS", "operation failed", nil)
 	}
 	content, ok := r.Value.(string)
 	if !ok {
@@ -51,7 +40,17 @@ func (l *localCoreFS) EnsureDir(
 ) (
 	_ error, // result
 ) {
-	return localCoreFSErr(l.fs.EnsureDir(path))
+	r := l.fs.EnsureDir(path)
+	if r.OK {
+		return nil
+	}
+	if err, ok := r.Value.(error); ok && err != nil {
+		return err
+	}
+	if r.Value != nil {
+		return core.E("localCoreFS", core.Sprint(r.Value), nil)
+	}
+	return core.E("localCoreFS", "operation failed", nil)
 }
 
 func (l *localCoreFS) List(path string) (
@@ -60,7 +59,13 @@ func (l *localCoreFS) List(path string) (
 ) {
 	r := l.fs.List(path)
 	if !r.OK {
-		return nil, localCoreFSErr(r)
+		if err, ok := r.Value.(error); ok && err != nil {
+			return nil, err
+		}
+		if r.Value != nil {
+			return nil, core.E("localCoreFS", core.Sprint(r.Value), nil)
+		}
+		return nil, core.E("localCoreFS", "operation failed", nil)
 	}
 	entries, ok := r.Value.([]core.FsDirEntry)
 	if !ok {
@@ -78,5 +83,15 @@ func (l *localCoreFS) Delete(
 ) (
 	_ error, // result
 ) {
-	return localCoreFSErr(l.fs.Delete(path))
+	r := l.fs.Delete(path)
+	if r.OK {
+		return nil
+	}
+	if err, ok := r.Value.(error); ok && err != nil {
+		return err
+	}
+	if r.Value != nil {
+		return core.E("localCoreFS", core.Sprint(r.Value), nil)
+	}
+	return core.E("localCoreFS", "operation failed", nil)
 }
diff --git a/go/pkg/mcp/brain/client/coreio_compat.go b/go/pkg/mcp/brain/client/coreio_compat.go
index 0b5a218..e486934 100644
--- a/go/pkg/mcp/brain/client/coreio_compat.go
+++ b/go/pkg/mcp/brain/client/coreio_compat.go
@@ -14,30 +14,19 @@ var coreio = struct {
 	Local: &localCoreFS{fs: (&core.Fs{}).New("/")},
 }
 
-func localCoreFSErr(
-	r core.Result,
-) (
-	_ error, // result
-) {
-	if r.OK {
-		return nil
-	}
-	if err, ok := r.Value.(error); ok && err != nil {
-		return err
-	}
-	if r.Value != nil {
-		return core.E("localCoreFS", core.Sprint(r.Value), nil)
-	}
-	return core.E("localCoreFS", "operation failed", nil)
-}
-
 func (l *localCoreFS) Stat(path string) (
 	core.FsFileInfo,
 	error,
 ) {
 	r := l.fs.Stat(path)
 	if !r.OK {
-		return nil, localCoreFSErr(r)
+		if err, ok := r.Value.(error); ok && err != nil {
+			return nil, err
+		}
+		if r.Value != nil {
+			return nil, core.E("localCoreFS", core.Sprint(r.Value), nil)
+		}
+		return nil, core.E("localCoreFS", "operation failed", nil)
 	}
 	info, ok := r.Value.(core.FsFileInfo)
 	if !ok {
@@ -52,7 +41,13 @@ func (l *localCoreFS) Read(path string) (
 ) {
 	r := l.fs.Read(path)
 	if !r.OK {
-		return "", localCoreFSErr(r)
+		if err, ok := r.Value.(error); ok && err != nil {
+			return "", err
+		}
+		if r.Value != nil {
+			return "", core.E("localCoreFS", core.Sprint(r.Value), nil)
+		}
+		return "", core.E("localCoreFS", "operation failed", nil)
 	}
 	content, ok := r.Value.(string)
 	if !ok {
@@ -68,5 +63,15 @@ func (l *localCoreFS) WriteMode(
 ) (
 	_ error, // result
 ) {
-	return localCoreFSErr(l.fs.WriteMode(path, content, mode))
+	r := l.fs.WriteMode(path, content, mode)
+	if r.OK {
+		return nil
+	}
+	if err, ok := r.Value.(error); ok && err != nil {
+		return err
+	}
+	if r.Value != nil {
+		return core.E("localCoreFS", core.Sprint(r.Value), nil)
+	}
+	return core.E("localCoreFS", "operation failed", nil)
 }