diff --git a/.changeset/fix-cli-shebang-node.md b/.changeset/fix-cli-shebang-node.md
new file mode 100644
index 00000000..f463894c
--- /dev/null
+++ b/.changeset/fix-cli-shebang-node.md
@@ -0,0 +1,5 @@
+---
+"perstack": patch
+---
+
+Change CLI shebang from `#!/usr/bin/env bun` to `#!/usr/bin/env node` so `npx perstack` works without bun installed.
diff --git a/definitions/create-expert/perstack.toml b/definitions/create-expert/perstack.toml
index 303b95c6..0a374b59 100644
--- a/definitions/create-expert/perstack.toml
+++ b/definitions/create-expert/perstack.toml
@@ -34,6 +34,7 @@ delegates = ["@create-expert/planner", "@create-expert/skill-finder", "@create-e
 
 [experts."create-expert".skills."@perstack/base"]
 type = "mcpStdioSkill"
+description = "File operations and task completion"
 command = "npx"
 packageName = "@perstack/base"
 pick = ["exec", "attemptCompletion"]
@@ -128,6 +129,7 @@ After writing the file, attemptCompletion with the file path.
 
 [experts."@create-expert/planner".skills."@perstack/base"]
 type = "mcpStdioSkill"
+description = "File operations, command execution, and task management"
 command = "npx"
 packageName = "@perstack/base"
 pick = ["readTextFile", "writeTextFile", "exec", "todo", "attemptCompletion"]
@@ -185,12 +187,14 @@ After writing skill-report.md, attemptCompletion with the file path.
 
 [experts."@create-expert/skill-finder".skills."@perstack/base"]
 type = "mcpStdioSkill"
+description = "File operations, command execution, and task management"
 command = "npx"
 packageName = "@perstack/base"
 pick = ["readTextFile", "writeTextFile", "exec", "todo", "attemptCompletion"]
 
 [experts."@create-expert/skill-finder".skills."@perstack/create-expert-skill"]
 type = "mcpStdioSkill"
+description = "Search and inspect MCP servers from the registry"
 command = "npx"
 packageName = "@perstack/create-expert-skill"
 pick = ["searchMcpRegistry", "getMcpServerDetail"]
@@ -289,6 +293,7 @@ To incorporate MCP skills into the expert definition:
 
 [experts."@create-expert/definition-writer".skills."@perstack/base"]
 type = "mcpStdioSkill"
+description = "File operations, command execution, and task management"
 command = "npx"
 packageName = "@perstack/base"
 pick = ["readTextFile", "writeTextFile", "exec", "todo", "attemptCompletion"]
@@ -344,6 +349,7 @@ If issues found:
 
 [experts."@create-expert/expert-tester".skills."@perstack/base"]
 type = "mcpStdioSkill"
+description = "File operations, command execution, delegation management, and task tracking"
 command = "npx"
 packageName = "@perstack/base"
 pick = [