diff --git a/harnesses/contexts/airouter/v1/bin/anthropic-compat-wrapper.sh b/harnesses/contexts/airouter/v1/bin/anthropic-compat-wrapper.sh
new file mode 100755
index 0000000..118dac8
--- /dev/null
+++ b/harnesses/contexts/airouter/v1/bin/anthropic-compat-wrapper.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+# Anthropic-compat wrapper for airouter harness (Phase 9 ESO-managed secrets)
+# Reads airouter credentials from /run/agent/secrets/airouter/ and passes them
+# as env vars to the underlying Claude runner.
+set -euo pipefail
+
+exec env \
+  ANTHROPIC_AUTH_TOKEN="$(cat /run/agent/secrets/airouter/auth_token)" \
+  ANTHROPIC_BASE_URL="$(cat /run/agent/secrets/airouter/base_url)" \
+  claude "$@"
\ No newline at end of file
diff --git a/harnesses/contexts/airouter/v1/harness.yaml b/harnesses/contexts/airouter/v1/harness.yaml
index eedffad..7e4b3d5 100644
--- a/harnesses/contexts/airouter/v1/harness.yaml
+++ b/harnesses/contexts/airouter/v1/harness.yaml
@@ -8,7 +8,11 @@ provides: [agentic-runner]
 env:
   OPENAI_BASE_URL: "https://api.airouter.ch/v1"
 
-secrets_files:
-  - source: ./provider.sops.env
-    target: /opt/harness/secrets/airouter/provider.sops.env
-    encrypted: true
+secrets_required:
+  - name: airouter
+    account_ref: "airouter"
+    mount_path: /run/agent/secrets/airouter
+    mode: "0400"
+
+scripts:
+  init: ./init.sh
diff --git a/harnesses/contexts/airouter/v1/init.sh b/harnesses/contexts/airouter/v1/init.sh
new file mode 100755
index 0000000..0fc4919
--- /dev/null
+++ b/harnesses/contexts/airouter/v1/init.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+# airouter init — Phase 9 ESO-managed secret mount.
+#
+# Verifies the ESO-mounted secret files exist; the wrapper
+# (`bin/anthropic-compat-wrapper.sh`) reads them at exec time.
+#
+# Per H-SECRET-4: NO `export` of credentials here. The earlier draft of this
+# file exported ANTHROPIC_AUTH_TOKEN and ANTHROPIC_BASE_URL from this script,
+# which runs as root under uid-wrapper.sh — even though the export was
+# subshell-scoped, the secret was briefly resident in /proc/<pid>/environ of
+# a root process. The wrapper's `exec env VAR=...` pattern is the only
+# acceptable credential delivery point.
+set -euo pipefail
+
+SECRETS_DIR="/run/agent/secrets/airouter"
+
+if [ ! -d "$SECRETS_DIR" ]; then
+    echo "ERROR: Secret directory $SECRETS_DIR not found. ESO mount may have failed." >&2
+    exit 1
+fi
+
+for f in auth_token base_url; do
+    if [ ! -r "$SECRETS_DIR/$f" ]; then
+        echo "ERROR: $SECRETS_DIR/$f not readable. Check ESO ExternalSecret for airouter." >&2
+        exit 1
+    fi
+done
+
+echo "airouter secrets verified at $SECRETS_DIR"
diff --git a/harnesses/contexts/gitea-admin/v1/bin/gitea-admin-wrapper.sh b/harnesses/contexts/gitea-admin/v1/bin/gitea-admin-wrapper.sh
new file mode 100755
index 0000000..23d94eb
--- /dev/null
+++ b/harnesses/contexts/gitea-admin/v1/bin/gitea-admin-wrapper.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+# gitea-admin-wrapper.sh — reads the ESO-mounted gitea-admin token at exec time
+# and prefixes it as a transient env var to the underlying tool.
+#
+# M22 Phase 9: token mounted at /run/agent/secrets/gitea-admin/token (read-only,
+# tmpfs, mode 0400). The token NEVER enters the wrapper's parent shell — only
+# the exec'd tool's environment via `exec env VAR=value cmd`. The brief
+# presence in /proc/<tool_pid>/environ of the tool process is the accepted
+# floor (per spec/secrets-runtime.md SR-DISP-7 / H-SECRET-4).
+set -euo pipefail
+
+TOKEN_FILE="/run/agent/secrets/gitea-admin/token"
+
+# git-credential-helper subcommand: read token and emit git credential format.
+# Git invokes us as `gitea-admin-wrapper.sh git-credential-helper get` and
+# expects key=value lines on stdout terminated by a blank line.
+git_credential_helper() {
+    if [[ ! -r "$TOKEN_FILE" ]]; then
+        echo "gitea-admin-wrapper: token file not readable at $TOKEN_FILE" >&2
+        exit 1
+    fi
+    local base_url="${GITEA_BASE_URL:-https://gitea.oreillyit.nz}"
+    local host
+    host=$(echo "$base_url" | sed 's|https\?://||')
+    # Trailing blank line per git credential-helper protocol.
+    printf 'protocol=https\nhost=%s\nusername=git\npassword=%s\n\n' "$host" "$(cat "$TOKEN_FILE")"
+    exit 0
+}
+
+case "${1:-}" in
+    git-credential-helper)
+        git_credential_helper
+        ;;
+    *)
+        if [[ ! -r "$TOKEN_FILE" ]]; then
+            echo "gitea-admin-wrapper: token file not readable at $TOKEN_FILE" >&2
+            exit 1
+        fi
+        # `exec env VAR=...` keeps the secret out of the wrapper's parent shell
+        # — it lands only in the exec'd tool's /proc/<pid>/environ. NEVER use
+        # `export VAR=` here, which would leak the secret to the wrapper's
+        # ancestors (H-SECRET-4 violation).
+        exec env GITEA_ADMIN_TOKEN="$(cat "$TOKEN_FILE")" "$@"
+        ;;
+esac
diff --git a/harnesses/contexts/gitea-admin/v1/harness.yaml b/harnesses/contexts/gitea-admin/v1/harness.yaml
index 0da19d0..a449dfa 100644
--- a/harnesses/contexts/gitea-admin/v1/harness.yaml
+++ b/harnesses/contexts/gitea-admin/v1/harness.yaml
@@ -17,11 +17,18 @@ ssh_hosts:
     identity_secret: SSH_KEY_AI_ENABLEMENT
 
 secrets_required:
+  # ESO-managed gitea-admin token (M22 Phase 9)
+  - name: gitea-admin
+    account_ref: "gitea-admin"
+    mount_path: /run/agent/secrets/gitea-admin
+    mode: "0400"
+  # Legacy SSH key (file-based, already delivered as mount)
   - name: SSH_KEY_AI_ENABLEMENT
     mount: /home/agent/.ssh/id_ed25519
     mode: "0600"
 
-secrets_files:
-  - source: ./provider.sops.env
-    target: /opt/harness/secrets/gitea-admin/provider.sops.env
-    encrypted: true
\ No newline at end of file
+env:
+  GITEA_BASE_URL: "https://gitea.oreillyit.nz"
+
+scripts:
+  init: ./init.sh
\ No newline at end of file
diff --git a/harnesses/contexts/gitea-admin/v1/init.sh b/harnesses/contexts/gitea-admin/v1/init.sh
new file mode 100755
index 0000000..1e14f2b
--- /dev/null
+++ b/harnesses/contexts/gitea-admin/v1/init.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+# init.sh for gitea-admin harness (M22 Phase 9)
+# Sets up non-secret env vars and configures git credential helper.
+# Credential token is NOT exported here — only read at exec time by the wrapper.
+
+set -euo pipefail
+
+# Non-secret configuration
+export GITEA_BASE_URL="${GITEA_BASE_URL:-https://gitea.oreillyit.nz}"
+
+# Ensure SSH directory exists with correct permissions
+mkdir -p /home/agent/.ssh
+chmod 700 /home/agent/.ssh
+
+# Configure git to use the gitea-admin credential helper wrapper
+# The wrapper reads the ESO-mounted token at exec time
+git config --global credential.helper "!/opt/harness/contexts/gitea-admin/v1/bin/gitea-admin-wrapper.sh git-credential-helper"
+
+echo "[gitea-admin] init complete"
diff --git a/harnesses/contexts/gitea-https/v1/harness.yaml b/harnesses/contexts/gitea-https/v1/harness.yaml
index b41e49a..d6c3d56 100644
--- a/harnesses/contexts/gitea-https/v1/harness.yaml
+++ b/harnesses/contexts/gitea-https/v1/harness.yaml
@@ -12,7 +12,8 @@ git_identity:
 scripts:
   init: "./init.sh"
 
-secrets_files:
-  - source: ./provider.sops.env
-    target: /opt/harness/secrets/gitea-https/provider.sops.env
-    encrypted: true
+secrets_required:
+  - name: gitea-https
+    account_ref: "gitea-https"
+    mount_path: /run/agent/secrets/gitea-https
+    mode: "0400"
diff --git a/harnesses/contexts/gitea-https/v1/init.sh b/harnesses/contexts/gitea-https/v1/init.sh
index f1f4151..d999f56 100755
--- a/harnesses/contexts/gitea-https/v1/init.sh
+++ b/harnesses/contexts/gitea-https/v1/init.sh
@@ -1,8 +1,8 @@
 #!/bin/bash
-# Configure git to use GITEA_TOKEN for HTTPS cloning/pushing to gitea.oreillyit.nz
+# Configure git to use git credential helper for gitea.oreillyit.nz via HTTPS.
 #
-# Uses a credential helper script that reads the token from the environment.
-# This avoids embedding the token in clone URLs (which would appear in logs).
+# The token is read from /run/agent/secrets/gitea-https/token at every git
+# invocation (not at init time). This avoids the token appearing in logs.
 
 set -euo pipefail
 
@@ -11,14 +11,16 @@ CRED_HELPER="/opt/harness/contexts/gitea-https/v1/git-credential-gitea.sh"
 # Create the credential helper script
 cat > "$CRED_HELPER" << 'HELPER_EOF'
 #!/bin/bash
-# Git credential helper that provides GITEA_TOKEN for gitea.oreillyit.nz
-if [ -z "${GITEA_TOKEN:-}" ]; then
-    exit 1
-fi
+# Git credential helper that provides the token from a mounted file
+# for gitea.oreillyit.nz.
+# This reads the file at EVERY git invocation, not at init time.
+set -euo pipefail
+SECRET_FILE=/run/agent/secrets/gitea-https/token
+[ -r "$SECRET_FILE" ] || exit 1
 echo "protocol=https"
 echo "host=gitea.oreillyit.nz"
 echo "username=token"
-echo "password=${GITEA_TOKEN}"
+echo "password=$(cat $SECRET_FILE)"
 HELPER_EOF
 
 chmod +x "$CRED_HELPER"
@@ -26,4 +28,4 @@ chmod +x "$CRED_HELPER"
 # Configure git to use this credential helper for gitea.oreillyit.nz
 git config --global credential.https://gitea.oreillyit.nz.helper "$CRED_HELPER"
 
-echo "Git HTTPS credential helper configured for gitea.oreillyit.nz"
+echo "Git HTTPS credential helper configured for gitea.oreillyit.nz"
\ No newline at end of file
diff --git a/harnesses/contexts/gitea-ssh-accelerators/v1/harness.yaml b/harnesses/contexts/gitea-ssh-accelerators/v1/harness.yaml
index 78d5a13..dae5536 100644
--- a/harnesses/contexts/gitea-ssh-accelerators/v1/harness.yaml
+++ b/harnesses/contexts/gitea-ssh-accelerators/v1/harness.yaml
@@ -18,7 +18,8 @@ ssh_hosts:
 scripts:
   init: "./init.sh"
 
-secrets_files:
-  - source: ./ssh-key.sops.env
-    target: /opt/harness/secrets/gitea-ssh-accelerators/ssh-key.sops.env
-    encrypted: true
+secrets_required:
+  - name: gitea-ssh-accelerators
+    account_ref: "gitea-ssh-accelerators"
+    mount_path: /run/agent/secrets/gitea-ssh-accelerators
+    mode: "0400"
diff --git a/harnesses/contexts/gitea-ssh-accelerators/v1/init.sh b/harnesses/contexts/gitea-ssh-accelerators/v1/init.sh
index 9539f8d..b1f3a0d 100755
--- a/harnesses/contexts/gitea-ssh-accelerators/v1/init.sh
+++ b/harnesses/contexts/gitea-ssh-accelerators/v1/init.sh
@@ -1,29 +1,21 @@
 #!/bin/bash
+# gitea-ssh-accelerators init: copy the ESO-mounted SSH key to the path the
+# harness-init `~/.ssh/config` expects (`IdentityFile /home/agent/.ssh/gitea-oreillyit-nz-accelerators`).
+#
+# Per H-SECRET-4: NO `export` of credentials. (The earlier draft set
+# `GIT_SSH_COMMAND` here — a path, not a credential — but that export dies
+# with the subshell and the harness-init's SSH config is the load-bearing
+# path anyway.)
 set -euo pipefail
 
-# Extract SSH private key from decrypted env file for the accelerators identity.
-# The meta-init script generates ~/.ssh/config with
-# IdentityFile /home/agent/.ssh/gitea-oreillyit-nz-accelerators
-# matching the ssh_hosts alias in harness.yaml.
+SSH_KEY_SRC="/run/agent/secrets/gitea-ssh-accelerators/id_ed25519"
+SSH_KEY_DST="/home/agent/.ssh/gitea-oreillyit-nz-accelerators"
 
-SSH_KEY_FILE="/home/agent/.ssh/gitea-oreillyit-nz-accelerators"
-
-for env_file in /opt/harness/secrets/gitea-ssh-accelerators/*.decrypted.env /opt/harness/secrets/gitea-ssh-accelerators/*.env; do
-    [ -f "$env_file" ] || continue
-    while IFS='=' read -r key value; do
-        [[ "$key" =~ ^[[:space:]]*# ]] && continue
-        [[ -z "$key" ]] && continue
-        if [ "$key" = "GITEA_SSH_KEY" ]; then
-            mkdir -p /home/agent/.ssh
-            echo "$value" | base64 -d > "$SSH_KEY_FILE"
-            chmod 600 "$SSH_KEY_FILE"
-            chown agent:agent "$SSH_KEY_FILE"
-            echo "SSH key written to $SSH_KEY_FILE"
-            break 2
-        fi
-    done < "$env_file"
-done
-
-if [ ! -f "$SSH_KEY_FILE" ]; then
-    echo "WARNING: GITEA_SSH_KEY not found in any env file under /opt/harness/secrets/gitea-ssh-accelerators/"
+if [ ! -r "$SSH_KEY_SRC" ]; then
+    echo "ERROR: SSH key not found at $SSH_KEY_SRC — ESO ExternalSecret not Ready?" >&2
+    exit 1
 fi
+
+mkdir -p /home/agent/.ssh
+install -m 0600 -o agent -g agent "$SSH_KEY_SRC" "$SSH_KEY_DST"
+echo "gitea-ssh-accelerators: SSH key staged at $SSH_KEY_DST (0600 agent:agent)"
diff --git a/harnesses/contexts/gitea-ssh-homelab/v1/harness.yaml b/harnesses/contexts/gitea-ssh-homelab/v1/harness.yaml
index 9adadd2..186a129 100644
--- a/harnesses/contexts/gitea-ssh-homelab/v1/harness.yaml
+++ b/harnesses/contexts/gitea-ssh-homelab/v1/harness.yaml
@@ -18,7 +18,8 @@ ssh_hosts:
 scripts:
   init: "./init.sh"
 
-secrets_files:
-  - source: ./ssh-key.sops.env
-    target: /opt/harness/secrets/gitea-ssh-homelab/ssh-key.sops.env
-    encrypted: true
+secrets_required:
+  - name: gitea-ssh-homelab
+    account_ref: "gitea-ssh-homelab"
+    mount_path: /run/agent/secrets/gitea-ssh-homelab
+    mode: "0400"
\ No newline at end of file
diff --git a/harnesses/contexts/gitea-ssh-homelab/v1/init.sh b/harnesses/contexts/gitea-ssh-homelab/v1/init.sh
index 603f3ba..c8ad514 100755
--- a/harnesses/contexts/gitea-ssh-homelab/v1/init.sh
+++ b/harnesses/contexts/gitea-ssh-homelab/v1/init.sh
@@ -1,29 +1,30 @@
 #!/bin/bash
+# gitea-ssh-homelab init: copy the ESO-mounted SSH key to the path the
+# harness-init `~/.ssh/config` expects.
+#
+# The harness-init dispatcher (`entrypoint/harness_init.py`) writes
+# `~/.ssh/config` from the harness's `ssh_hosts:` block; for this provider
+# the entry is `Host gitea.oreillyit.nz-homelab` with
+# `IdentityFile /home/agent/.ssh/gitea-oreillyit-nz-homelab`.
+#
+# We only need to materialise the key file at that path. We MUST NOT append
+# our own SSH config block — doing so would (a) duplicate harness-init's
+# config (SSH first-match-wins, so the appended block becomes dead) and
+# (b) any unaliased `Host gitea.oreillyit.nz` block would collide with
+# other gitea harnesses (gitea-https, gitea-admin) when composed.
+#
+# Per H-SECRET-4: NO `export` of credentials here. The path to the key is
+# not a secret; the key content is, and it stays in the file.
 set -euo pipefail
 
-# Extract SSH private key from decrypted env file for the homelab identity.
-# The meta-init script generates ~/.ssh/config with
-# IdentityFile /home/agent/.ssh/gitea-oreillyit-nz-homelab
-# matching the ssh_hosts alias in harness.yaml.
+SSH_KEY_SRC="/run/agent/secrets/gitea-ssh-homelab/id_ed25519"
+SSH_KEY_DST="/home/agent/.ssh/gitea-oreillyit-nz-homelab"
 
-SSH_KEY_FILE="/home/agent/.ssh/gitea-oreillyit-nz-homelab"
-
-for env_file in /opt/harness/secrets/gitea-ssh-homelab/*.decrypted.env /opt/harness/secrets/gitea-ssh-homelab/*.env; do
-    [ -f "$env_file" ] || continue
-    while IFS='=' read -r key value; do
-        [[ "$key" =~ ^[[:space:]]*# ]] && continue
-        [[ -z "$key" ]] && continue
-        if [ "$key" = "GITEA_SSH_KEY" ]; then
-            mkdir -p /home/agent/.ssh
-            echo "$value" | base64 -d > "$SSH_KEY_FILE"
-            chmod 600 "$SSH_KEY_FILE"
-            chown agent:agent "$SSH_KEY_FILE"
-            echo "SSH key written to $SSH_KEY_FILE"
-            break 2
-        fi
-    done < "$env_file"
-done
-
-if [ ! -f "$SSH_KEY_FILE" ]; then
-    echo "WARNING: GITEA_SSH_KEY not found in any env file under /opt/harness/secrets/gitea-ssh-homelab/"
+if [ ! -r "$SSH_KEY_SRC" ]; then
+    echo "ERROR: SSH key not found at $SSH_KEY_SRC — ESO ExternalSecret not Ready?" >&2
+    exit 1
 fi
+
+mkdir -p /home/agent/.ssh
+install -m 0600 -o agent -g agent "$SSH_KEY_SRC" "$SSH_KEY_DST"
+echo "gitea-ssh-homelab: SSH key staged at $SSH_KEY_DST (0600 agent:agent)"
diff --git a/harnesses/contexts/gitea-ssh/v1/harness.yaml b/harnesses/contexts/gitea-ssh/v1/harness.yaml
index c053f3a..44a4930 100644
--- a/harnesses/contexts/gitea-ssh/v1/harness.yaml
+++ b/harnesses/contexts/gitea-ssh/v1/harness.yaml
@@ -18,7 +18,8 @@ ssh_hosts:
 scripts:
   init: "./init.sh"
 
-secrets_files:
-  - source: ./ssh-key.sops.env
-    target: /opt/harness/secrets/gitea-ssh/ssh-key.sops.env
-    encrypted: true
+secrets_required:
+  - name: gitea-ssh
+    account_ref: "gitea-ssh"
+    mount_path: /run/agent/secrets/gitea-ssh
+    mode: "0400"
diff --git a/harnesses/contexts/gitea-ssh/v1/init.sh b/harnesses/contexts/gitea-ssh/v1/init.sh
index 69ab84a..ef21962 100755
--- a/harnesses/contexts/gitea-ssh/v1/init.sh
+++ b/harnesses/contexts/gitea-ssh/v1/init.sh
@@ -1,32 +1,27 @@
 #!/bin/bash
+# gitea-ssh init: copy the ESO-mounted SSH key to the path the harness-init
+# `~/.ssh/config` expects.
+#
+# The harness-init dispatcher writes `~/.ssh/config` with
+#   IdentityFile /home/agent/.ssh/gitea-oreillyit-nz-ai-enablement
+# so the key must end up at that path with mode 0600 owned by agent.
+#
+# The ESO mount at /run/agent/secrets/gitea-ssh/private_key is read-only
+# (V1VolumeMount(read_only=True)), so chmod against it would fail with EROFS.
+# install(1) handles permissions/ownership atomically against the destination.
+#
+# Per M22 Phase 9 file-only delivery (H-SECRET-4): no credential value enters
+# an env var.
 set -euo pipefail
 
-# Extract SSH private key from decrypted env file and write to the per-host
-# identity file path. The meta-init script generates ~/.ssh/config with
-# IdentityFile /home/agent/.ssh/gitea-oreillyit-nz-ai-enablement
-# matching the ssh_hosts alias in harness.yaml.
+SSH_KEY_SRC="/run/agent/secrets/gitea-ssh/private_key"
+SSH_KEY_DST="/home/agent/.ssh/gitea-oreillyit-nz-ai-enablement"
 
-SSH_KEY_FILE="/home/agent/.ssh/gitea-oreillyit-nz-ai-enablement"
-
-# Find the decrypted env file (dispatcher decrypts SOPS at dispatch time for K8s,
-# or the meta-init script decrypts for Docker)
-for env_file in /opt/harness/secrets/gitea-ssh/*.decrypted.env /opt/harness/secrets/gitea-ssh/*.env; do
-    [ -f "$env_file" ] || continue
-    while IFS='=' read -r key value; do
-        # Skip comments and blank lines
-        [[ "$key" =~ ^[[:space:]]*# ]] && continue
-        [[ -z "$key" ]] && continue
-        if [ "$key" = "GITEA_SSH_KEY" ]; then
-            mkdir -p /home/agent/.ssh
-            echo "$value" | base64 -d > "$SSH_KEY_FILE"
-            chmod 600 "$SSH_KEY_FILE"
-            chown agent:agent "$SSH_KEY_FILE"
-            echo "SSH key written to $SSH_KEY_FILE"
-            break 2
-        fi
-    done < "$env_file"
-done
-
-if [ ! -f "$SSH_KEY_FILE" ]; then
-    echo "WARNING: GITEA_SSH_KEY not found in any env file under /opt/harness/secrets/gitea-ssh/"
+if [ ! -r "$SSH_KEY_SRC" ]; then
+    echo "ERROR: SSH key not found at $SSH_KEY_SRC — ESO ExternalSecret not Ready?" >&2
+    exit 1
 fi
+
+mkdir -p /home/agent/.ssh
+install -m 0600 -o agent -g agent "$SSH_KEY_SRC" "$SSH_KEY_DST"
+echo "gitea-ssh: SSH key staged at $SSH_KEY_DST (0600 agent:agent)"
diff --git a/harnesses/contexts/minimax/v1/bin/anthropic-compat-wrapper.sh b/harnesses/contexts/minimax/v1/bin/anthropic-compat-wrapper.sh
new file mode 100755
index 0000000..a0b11c3
--- /dev/null
+++ b/harnesses/contexts/minimax/v1/bin/anthropic-compat-wrapper.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+# Anthropic-compat wrapper for MiniMax (Phase 9 ESO-managed secrets).
+# Reads the api_key file and passes it as ANTHROPIC_AUTH_TOKEN to claude.
+# ANTHROPIC_BASE_URL is set in harness.yaml `env:` and flows through.
+set -euo pipefail
+
+exec env \
+  ANTHROPIC_AUTH_TOKEN="$(cat /run/agent/secrets/minimax/api_key)" \
+  claude "$@"
diff --git a/harnesses/contexts/minimax/v1/harness.yaml b/harnesses/contexts/minimax/v1/harness.yaml
index a599dc8..1d50c07 100644
--- a/harnesses/contexts/minimax/v1/harness.yaml
+++ b/harnesses/contexts/minimax/v1/harness.yaml
@@ -11,9 +11,13 @@ env:
   CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC: "1"
   DISABLE_PROMPT_CACHING: "1"
 
-secrets_files:
-  - source: ./provider.sops.env
-    target: /opt/harness/secrets/minimax/provider.sops.env
-    encrypted: true
+secrets_required:
+  - name: minimax
+    account_ref: "minimax"
+    mount_path: /run/agent/secrets/minimax
+    mode: "0400"
 
-# TODO: Add network_hosts for api.minimax.io when context harnesses support it
\ No newline at end of file
+scripts:
+  init: ./init.sh
+
+# TODO: Add network_hosts for api.minimax.io when context harnesses support it
diff --git a/harnesses/contexts/minimax/v1/init.sh b/harnesses/contexts/minimax/v1/init.sh
new file mode 100755
index 0000000..4fcd3f2
--- /dev/null
+++ b/harnesses/contexts/minimax/v1/init.sh
@@ -0,0 +1,18 @@
+#!/bin/bash
+set -euo pipefail
+
+# Verify the ESO-managed MiniMax api_key file is mounted. The wrapper
+# (`bin/anthropic-compat-wrapper.sh`) reads it at exec time and exports
+# ANTHROPIC_AUTH_TOKEN to the claude subprocess.
+#
+# ANTHROPIC_BASE_URL is set in harness.yaml `env:` (not in the K8s Secret),
+# so no file check is required for it.
+
+API_KEY_FILE="/run/agent/secrets/minimax/api_key"
+
+if [ ! -r "$API_KEY_FILE" ]; then
+    echo "ERROR: $API_KEY_FILE not readable. Check ESO ExternalSecret acct-<minimax-id>." >&2
+    exit 1
+fi
+
+echo "minimax api_key verified at $API_KEY_FILE"
diff --git a/harnesses/contexts/z-ai/v1/bin/anthropic-compat-wrapper.sh b/harnesses/contexts/z-ai/v1/bin/anthropic-compat-wrapper.sh
new file mode 100755
index 0000000..4a6f4bc
--- /dev/null
+++ b/harnesses/contexts/z-ai/v1/bin/anthropic-compat-wrapper.sh
@@ -0,0 +1,12 @@
+#!/bin/bash
+# z-ai Anthropic-compatible wrapper — injects ESO-mounted credentials
+# M22 Phase 9 Wave 4
+# Files at /run/agent/secrets/z-ai/ are mounted by the dispatcher via ESO K8s Secret
+set -euo pipefail
+
+SECRETS_DIR="/run/agent/secrets/z-ai"
+
+exec env \
+  ANTHROPIC_AUTH_TOKEN="$(cat "$SECRETS_DIR/auth_token")" \
+  ANTHROPIC_BASE_URL="$(cat "$SECRETS_DIR/base_url")" \
+  claude "$@"
diff --git a/harnesses/contexts/z-ai/v1/harness.yaml b/harnesses/contexts/z-ai/v1/harness.yaml
index c307c3c..cb9ca62 100644
--- a/harnesses/contexts/z-ai/v1/harness.yaml
+++ b/harnesses/contexts/z-ai/v1/harness.yaml
@@ -11,9 +11,13 @@ env:
   CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC: "1"
   DISABLE_PROMPT_CACHING: "1"
 
-secrets_files:
-  - source: ./provider.sops.env
-    target: /opt/harness/secrets/z-ai/provider.sops.env
-    encrypted: true
+secrets_required:
+  - name: z-ai
+    account_ref: "z-ai"
+    mount_path: /run/agent/secrets/z-ai
+    mode: "0400"
+
+scripts:
+  init: "./init.sh"
 
 # TODO: Add network_hosts for api.z.ai when context harnesses support it
\ No newline at end of file
diff --git a/harnesses/contexts/z-ai/v1/init.sh b/harnesses/contexts/z-ai/v1/init.sh
new file mode 100755
index 0000000..4153594
--- /dev/null
+++ b/harnesses/contexts/z-ai/v1/init.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+# z-ai harness init — verifies ESO secret mount exists
+# M22 Phase 9 Wave 4
+set -euo pipefail
+
+echo "=== z-ai/v1 init ==="
+
+SECRETS_DIR="/run/agent/secrets/z-ai"
+if [ ! -d "$SECRETS_DIR" ]; then
+    echo "ERROR: ESO secret mount not found at $SECRETS_DIR" >&2
+    echo "Has the dispatcher been configured with ESO-managed secrets?" >&2
+    exit 1
+fi
+
+echo "z-ai ESO secret mount verified at $SECRETS_DIR"
+echo "=== z-ai/v1 init complete ==="