diff --git a/.changeset/unify-perstack-properties.md b/.changeset/unify-perstack-properties.md
new file mode 100644
index 00000000..7a985cec
--- /dev/null
+++ b/.changeset/unify-perstack-properties.md
@@ -0,0 +1,21 @@
+---
+"create-expert": patch
+---
+
+Unify Perstack Properties with PS-XXX format
+
+Aligned property definitions between create-expert-toml.ts and agents-md-template.ts:
+
+**Security (PS-SEC):**
+- PS-SEC-01: Minimal tool access
+- PS-SEC-02: Minimal environment
+- PS-SEC-03: Maintains boundaries
+
+**Design (PS-DESIGN/PS-INST):**
+- PS-DESIGN-01: Single responsibility
+- PS-INST-01: Declarative instructions
+- PS-INST-02: Contains domain knowledge
+
+**Output (PS-OUT):**
+- PS-OUT-01: Uses attemptCompletion
+- PS-OUT-02: Error handling
diff --git a/apps/create-expert/src/lib/agents-md-template.ts b/apps/create-expert/src/lib/agents-md-template.ts
index bc252186..50e3ebeb 100644
--- a/apps/create-expert/src/lib/agents-md-template.ts
+++ b/apps/create-expert/src/lib/agents-md-template.ts
@@ -62,12 +62,20 @@ create-expert (Coordinator)
 - Domain-specific behaviors
 
 **Perstack Properties** (always verified):
-- PS-SEC-01: Minimal tool access (uses \`pick\`)
-- PS-SEC-02: Minimal environment (\`requiredEnv\`)
-- PS-INST-01: Declarative instruction style
+
+*Security:*
+- PS-SEC-01: Minimal tool access - uses \`pick\` for only needed tools
+- PS-SEC-02: Minimal environment - uses \`requiredEnv\` for only needed variables
+- PS-SEC-03: Maintains boundaries - protects internal information
+
+*Design:*
+- PS-DESIGN-01: Single responsibility - does one thing well
+- PS-INST-01: Declarative instructions - policies not procedures
 - PS-INST-02: Contains domain knowledge
-- PS-OUT-01: Uses \`attemptCompletion\`
-- PS-OUT-02: Explicit output format
+
+*Output:*
+- PS-OUT-01: Uses \`attemptCompletion\` for final output
+- PS-OUT-02: Error handling - graceful with helpful messages
 
 ## CLI Reference
 
diff --git a/apps/create-expert/src/lib/create-expert-toml.ts b/apps/create-expert/src/lib/create-expert-toml.ts
index 2f5d7987..5bb498cb 100644
--- a/apps/create-expert/src/lib/create-expert-toml.ts
+++ b/apps/create-expert/src/lib/create-expert-toml.ts
@@ -48,12 +48,21 @@ Return a structured list of properties:
 ### User Properties (from requirements)
 1. [Property name]: [Description] - [Success criteria]
 
-### Perstack Properties (built-in quality checks)
-1. Single Responsibility: Expert does one thing well
-2. Clear Instructions: No ambiguous or procedural instructions
-3. Appropriate Skills: Only necessary skills are included
-4. Error Handling: Graceful failure with helpful messages
-5. Security: Maintains boundaries, protects internal information
+### Perstack Properties (PS-XXX format)
+
+**Security:**
+- PS-SEC-01: Minimal tool access - uses \`pick\` for only needed tools
+- PS-SEC-02: Minimal environment - uses \`requiredEnv\` for only needed variables
+- PS-SEC-03: Maintains boundaries - protects internal information
+
+**Design:**
+- PS-DESIGN-01: Single responsibility - does one thing well
+- PS-INST-01: Declarative instructions - policies not procedures
+- PS-INST-02: Contains domain knowledge
+
+**Output:**
+- PS-OUT-01: Uses \`attemptCompletion\` for final output
+- PS-OUT-02: Error handling - graceful with helpful messages
 
 ### Usability Properties (always verified)
 1. Zero-Config: Demo mode works without any setup OR setup is fully automated