diff --git a/navi/core/agent.py b/navi/core/agent.py
index 4e522b8..2728a56 100644
--- a/navi/core/agent.py
+++ b/navi/core/agent.py
@@ -1120,11 +1120,19 @@
                 "- AGENT: <profile_id>  — needs 2+ tool calls; one subagent handles this ONE step\n"
                 "- SELF  — final synthesis or a context-dependent single action only\n\n"
                 "AGENT scoping rules (critical):\n"
-                "- Each AGENT step is one focused, self-contained unit of work.\n"
-                "- One AGENT step = one spawn_agent call later. Do NOT create one AGENT step "
-                "for 'do everything' — break the work into separate AGENT steps.\n"
-                "- A good AGENT step: 'Research pricing for product X' or 'Audit SSH config on host Y'.\n"
-                "- A bad AGENT step: 'Research everything and write the report' (too broad — split it).\n\n"
+                "- Each AGENT step is one focused, independently verifiable unit of work.\n"
+                "- One AGENT step = one spawn_agent call later. Do NOT bundle multiple concerns.\n"
+                "- Comma test: if your step description lists things with 'and' or commas, "
+                "each item is a separate step.\n"
+                "- For code implementation: one step writes or modifies ONE file, "
+                "or adds ONE focused feature to an existing file. "
+                "Never combine scaffold + business logic + helpers in one step.\n"
+                "- Good: 'Research X pricing from 3 sources' | "
+                "'Write tools/browser.py — skeleton class with __init__ and Chrome setup only' | "
+                "'Add proxy support to BrowserEngine'\n"
+                "- Bad: 'Implement BrowserEngine with stealth config, proxy support, and interaction patterns' "
+                "(commas = split into 3 steps) | "
+                "'Research everything and write the full report' (too broad)\n\n"
                 "Required output format (use exactly this structure):\n\n"
                 "## Plan\n\n"
                 "**Task:** [reformulated task]\n"