From a7632d6641246673d0b67ef67da32818ca0e15e7 Mon Sep 17 00:00:00 2001
From: serxa <sergei@clickhouse.com>
Date: Fri, 17 Jul 2026 19:16:14 +0000
Subject: [PATCH] Set setting_sources=[] so the CLI does not duplicate the
 prompt bundle
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Nerve builds the entire system prompt itself — the identity/memory bundle (SOUL/IDENTITY/USER/AGENTS/TOOLS/MEMORY) via system_prompt, plus permissions, MCP servers, hooks and env passed explicitly. Left at the default, the Claude Code CLI also auto-loads ~/.claude/CLAUDE.md (the bundle its own renderer writes for external claude-code use), duplicating tens of thousands of tokens on every turn.

Passing setting_sources=[] disables all filesystem settings/memory loading. ["project"] alone is insufficient: the managed workspace lives under $HOME, so project-root detection climbs to $HOME and loads the user-level CLAUDE.md under both the "user" and "project" sources. Native skills/plugins are unaffected (loaded via plugins / --plugin-dir).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 nerve/agent/backends/claude.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/nerve/agent/backends/claude.py b/nerve/agent/backends/claude.py
index 5223e53..7634555 100644
--- a/nerve/agent/backends/claude.py
+++ b/nerve/agent/backends/claude.py
@@ -476,6 +476,19 @@ def _cli_stderr(line: str) -> None:
             disallowed_tools=["CronCreate", "CronList", "CronDelete"],
             env=self._build_env(cache_ttl=spec.cache_ttl),
             cwd=spec.cwd,
+            # Load no filesystem settings/memory: Nerve owns the entire
+            # prompt. It injects the full identity/memory bundle
+            # (SOUL/IDENTITY/USER/AGENTS/TOOLS/MEMORY) via ``system_prompt``
+            # and passes permissions (``can_use_tool``), MCP (``mcp_servers``),
+            # hooks and env explicitly. Left at the default, the CLI would also
+            # auto-load ~/.claude/CLAUDE.md — the same bundle the Claude Code
+            # renderer writes for external claude-code use — duplicating tens
+            # of thousands of tokens every turn. ["project"] is NOT enough: the
+            # workspace lives under $HOME, so project-root detection climbs to
+            # $HOME and loads the user-level CLAUDE.md under both the "user" and
+            # "project" sources. Native skills/plugins are unaffected — they
+            # load via ``plugins`` (--plugin-dir), independent of this setting.
+            setting_sources=[],
             mcp_servers=self._build_mcp_servers(spec.session_id),
             # Claude Code plugins — loaded via --plugin-dir so the CLI
             # handles OAuth, credentials, and plugin lifecycle natively.