diff --git a/README.md b/README.md
index 5a7015f..e3e9590 100644
--- a/README.md
+++ b/README.md
@@ -325,6 +325,13 @@ The payload is inactive and unqualified. It does not call Claude Code, invoke a
 model, use a credential or network, write a target, publish, or activate a
 profile.
 
+## Inactive default producer config
+
+`profiles/default/v1/producer-config.json` is an immutable Git payload for the
+default producer preference. It grants no capability and does not select a
+profile, invoke a model, or contact a provider. Its focused test checks the
+config shape and exact Git object identity.
+
 ## Inactive local Git materializer protocol
 
 `adapters/local-git-materializer/v1/protocol.jq` defines the pure input, receipt,
diff --git a/RESTORE.md b/RESTORE.md
index dce165d..8ffb9c8 100644
--- a/RESTORE.md
+++ b/RESTORE.md
@@ -55,6 +55,19 @@ with the restored `scripts/core-contract.sh`. No compiled helper is installed or
 restored. A future activation must separately qualify and bind a production trusted
 parent; restoring these files does not select a live profile.
 
+### Restore the inactive default producer config
+
+Restore the two paths listed under “Inactive default producer config” in
+[`ci/required-files.txt`](ci/required-files.txt), then run:
+
+```sh
+bash scripts/test/default-producer-config.test.sh
+```
+
+The payload records an inactive producer preference. It does not select or
+activate a profile and performs no model, credential, provider, publish, or
+target operation.
+
 ---
 
 ## 1. Recreate yshifu (the manager)
diff --git a/ci/required-files.txt b/ci/required-files.txt
index c7dac9b..36d9972 100644
--- a/ci/required-files.txt
+++ b/ci/required-files.txt
@@ -261,6 +261,10 @@ scripts/test/local-git-materializer-adapter.test.sh
 adapters/claude-code-producer/v1/normalize.jq
 scripts/test/default-claude-code-producer-adapter.test.sh
 
+# Inactive default producer config
+profiles/default/v1/producer-config.json
+scripts/test/default-producer-config.test.sh
+
 # Inactive provider-neutral local Git materializer protocol
 adapters/local-git-materializer/v1/protocol.jq
 scripts/test/local-git-materializer-fixtures.sh
diff --git a/profiles/default/v1/producer-config.json b/profiles/default/v1/producer-config.json
new file mode 100644
index 0000000..369159a
--- /dev/null
+++ b/profiles/default/v1/producer-config.json
@@ -0,0 +1 @@
+{"effort_id":"high","model_id":"claude.sonnet","provider_id":"anthropic","schema_version":1}
diff --git a/scripts/test/default-producer-config.test.sh b/scripts/test/default-producer-config.test.sh
new file mode 100755
index 0000000..c548c71
--- /dev/null
+++ b/scripts/test/default-producer-config.test.sh
@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+set -euo pipefail
+export LC_ALL=C
+
+root=$(CDPATH='' cd -P -- "${BASH_SOURCE[0]%/*}/../.." && pwd -P)
+config='profiles/default/v1/producer-config.json'
+expected_blob='369159a30c8a0026644c3716e7fc1132206e826c'
+sha_file() { /usr/bin/shasum -a 256 "$1" | /usr/bin/awk '{print $1}'; }
+fail() { printf 'FAIL: %s\n' "$1" >&2; exit 1; }
+pass=0
+ok() { pass=$((pass + 1)); printf 'ok %s - %s\n' "$pass" "$1"; }
+
+platform=$(/usr/bin/uname -s):$(/usr/bin/uname -m)
+case "$platform" in
+  Linux:x86_64) asset='jq-linux64'; asset_sha='af986793a515d500ab2d35f8d2aecd656e764504b789b66d7e1a0b727a124c44' ;;
+  Darwin:x86_64|Darwin:arm64) asset='jq-osx-amd64'; asset_sha='5c0a0a3ea600f302ee458b30317425dd9632d1ad8882259fcaf4e9b868b2b1ef' ;;
+  *) fail "unsupported jq 1.6 proof platform: $platform" ;;
+esac
+jq_bin="${TMPDIR:-/tmp}/ystack-portable-core-jq16/$asset"
+[ -f "$jq_bin" ] && [ ! -L "$jq_bin" ] &&
+  [ "$(sha_file "$jq_bin")" = "$asset_sha" ] || fail 'pinned jq 1.6 is required'
+jq_command=("$jq_bin")
+[ "$platform" != Darwin:arm64 ] || jq_command=(/usr/bin/arch -x86_64 "$jq_bin")
+[ "$("${jq_command[@]}" --version)" = jq-1.6 ] || fail jq-version
+
+[ -f "$root/$config" ] && [ ! -L "$root/$config" ] || fail config-file
+[ "$(/usr/bin/git -C "$root" hash-object "$config")" = "$expected_blob" ] ||
+  fail config-blob
+index_record=$(/usr/bin/git -C "$root" ls-files --stage --error-unmatch -- "$config")
+expected_index=$'100644 369159a30c8a0026644c3716e7fc1132206e826c 0\tprofiles/default/v1/producer-config.json'
+[ "$index_record" = "$expected_index" ] ||
+  fail config-index-anchor
+ok 'the config is a tracked immutable Git blob'
+
+"${jq_command[@]}" -e '
+  type == "object" and
+  (keys | sort) == ["effort_id","model_id","provider_id","schema_version"] and
+  .schema_version == 1 and
+  .provider_id == "anthropic" and
+  .model_id == "claude.sonnet" and
+  .effort_id == "high"
+' "$root/$config" >/dev/null || fail producer-preference
+ok 'the config records the inactive default producer preference'
+
+printf 'default producer config: %s focused checks passed\n' "$pass"