diff --git a/audit-hermes-config.py b/audit-hermes-config.py
index 2c3d109..f2e6d8c 100644
--- a/audit-hermes-config.py
+++ b/audit-hermes-config.py
@@ -262,6 +262,41 @@ def audit(path):
                 f"{field_path} = {value!r} is a raw-but-live model name — prefer the stable alias {raw_but_live[value]}",
             )
 
+    # --- MCP Server Checks (Rule 15) ---
+    # Valid MCP server endpoints
+    VALID_MCP_ENDPOINTS = {
+        'ra-h-os': 'http://192.168.68.65:3100/mcp',
+        'litellm': 'https://litellm.sysloggh.net/mcp',
+    }
+    
+    # Check MCP servers if they exist
+    mcp_servers = cfg.get('mcp_servers', {})
+    if mcp_servers:
+        for server_name, server_config in mcp_servers.items():
+            url = server_config.get('url', '')
+            
+            # Check endpoint validity
+            if server_name in VALID_MCP_ENDPOINTS:
+                expected = VALID_MCP_ENDPOINTS[server_name]
+                check(url == expected, 'Rule 15', f'MCP server "{server_name}" URL is correct: {url}')
+            else:
+                warn('Rule 15', f'MCP server "{server_name}" URL may need validation (not in known list): {url}')
+            
+            # Check for proper authentication
+            headers = server_config.get('headers', {})
+            has_auth = False
+            for key, value in headers.items():
+                if 'key' in key.lower() or 'auth' in key.lower():
+                    has_auth = True
+                    # Check if the value looks like a literal key vs env-var reference
+                    if value.startswith('Bearer ') and value[7:].startswith('sk-'):
+                        check(True, 'Rule 15', f'MCP server "{server_name}" has valid auth header: {key}')
+                    else:
+                        warn('Rule 15', f'MCP server "{server_name}" header may use env-var instead of literal key: {key} = {value}')
+                    break
+            if not has_auth:
+                warn('Rule 15', f'MCP server "{server_name}" has no authentication header')
+
     # --- Report ---
     print(f"{'=' * 60}")
     print(f"Hermes Config Audit: {path}")
diff --git a/hermes-config-template.prose.md b/hermes-config-template.prose.md
index 0a1a6ef..9c393df 100644
--- a/hermes-config-template.prose.md
+++ b/hermes-config-template.prose.md
@@ -5,7 +5,8 @@ description: >
   Standard Hermes configuration template for Syslog Solution LLC agents.
   Enforces shared infrastructure setup (Firecrawl, SearXNG, local models,
   RA-H OS MCP) while keeping agent-specific API keys and model choices.
-  UPDATED 2026-08-07: Added Rule 15 (MCP Validation) from the 2026-08-07 keyless-MCP incident.
+  UPDATED 2026-08-07: Added litellm MCP server entry; updated Rule 15 (MCP Validation)
+  to enforce REAL key headers (not env-vars) from the 2026-08-07 keyless-MCP incident.
   Added Rule 12 (Context-Issue Diagnostic) + Rule 13 (.env fallback enforcement) from the
   2026-07-16 Mumuni root-cause investigation (WAL #1300).
   UPDATED 2026-07-12: GPU workload redistributed. Compression → Strix Halo. RTX 3090 context verified at 128K. Infisical .env fallback required (Rule 3/13).
@@ -145,6 +146,12 @@ mcp_servers:
     url: http://192.168.68.65:3100/mcp
     timeout: 120
     connect_timeout: 60
+  litellm:
+    url: https://litellm.sysloggh.net/mcp
+    headers:
+      x-litellm-api-key: "Bearer <AGENT_KEY>"   # Rule 15: must be a REAL key (sk-...), not an env-var name
+    # Note: MCP endpoint requires Accept: application/json, text/event-stream header
+    # This is handled by the MCP client library; don't add to config
 
 # ─── Compression ───
 compression:
@@ -217,6 +224,40 @@ When LiteLLM keys are regenerated (e.g., after infrastructure changes):
 3. **After update**: Restart Hermes on the agent host
 4. **Verify**: `curl -H "Authorization: Bearer sk-<KEY>" http://192.168.68.116/v1/models`
 
+## MCP Server Configuration
+
+MCP server entries in `mcp_servers:` must follow the format shown in the Template section.
+
+**Header requirements (Rule 15):**
+- Use `headers:` field with a `x-litellm-api-key` entry
+- The value must be `"Bearer <REAL_KEY>"` where `<REAL_KEY>` is a literal LiteLLM virtual key
+- Do NOT use env-var references like `$LITELLM_API_KEY` — they resolve to empty strings in
+  the static config and cause "Malformed API Key" errors (2026-08-07 Tanko incident)
+
+**Key source:**
+- Keys are stored in the Infisical vault (project=agents, env=production)
+- For template-based config generation: substitute the agent's key from the agent_keys table
+- For manual config updates: retrieve the key from the vault and insert the literal value
+
+**Verification (2026-08-07):**
+- Tested MCP initialize handshake against litellm.sysloggh.net/mcp with agent virtual key
+- Confirmed: 200 response with `serverInfo.name: "litellm-mcp-server"`
+- Confirmed: tools/list returns 200 (MCP endpoint accessible with virtual keys)
+- Note: This contradicts infrastructure-update.prose.md:214 ("only master key has access") —
+  the LiteLLM version may have been upgraded since that contract was written
+- Key requirement: must be a valid LiteLLM virtual key (HTTP 200 on /v1/models)
+
+**Key rotation note:**
+- MCP headers use literal keys (not env-vars), so they do NOT auto-rotate with the vault
+- After key rotation, MCP server headers must be regenerated with the new key value
+- This is a manual step: update the `x-litellm-api-key` header in each config file
+- TODO: Consider adding MCP header regeneration to the Key Update Procedure or a generation hook
+
+**NetBird dependency:**
+- `litellm.sysloggh.net` is a NetBird endpoint (see Rule 5 and Infrastructure Stack table)
+- NetBird outages cause 502 errors on MCP requests, not auth failures
+- Diagnose: if MCP requests fail with 502, check NetBird status before investigating keys
+
 ## Violation Classification
 
 When reporting findings, separate POLICY observations from FAULT findings:
@@ -455,14 +496,28 @@ curl -s -o /dev/null -w '%{http_code}' -H "Authorization: Bearer $K" http://192.
 - **Audit script**: Run `python3 /root/prose-contracts/audit-hermes-config.py <config.yaml>`
   before and after any config change to catch this and all other rule violations.
 
-### Rule 15: MCP Endpoint and Header Validation (ADDED 2026-08-07)
-- Every MCP server entry must point at the correct endpoint:
-  - ra-h-os = http://192.168.68.65:3100/mcp
-  - litellm = https://litellm.sysloggh.net/mcp
-- MCP entries must carry a REAL key value in the header.
-  - Avoid using env-var names like LITELLM_API_KEY in the header; they do not resolve for MCP
-    endpoints and result in "Malformed API Key" floods.
-  - Ensure the header value is the actual key (e.g., `sk-...`).
+### Rule 15: MCP Endpoint and Header Validation (UPDATED 2026-08-07)
+
+**Endpoint validation:**
+- ra-h-os must point to `http://192.168.68.65:3100/mcp`
+- litellm must point to `https://litellm.sysloggh.net/mcp`
+- Mismatched endpoints cause silent failures (e.g., 2026-08-07 incident: Tanko's config had
+  ra-h-os pointing to litellm's endpoint)
+
+**Header validation:**
+- Every MCP entry with authentication must carry a `headers:` field
+- The header value must be a REAL key (e.g., `Bearer sk-abc123...`), NOT an env-var name
+- Env-var names like `LITELLM_API_KEY` do NOT resolve in static MCP configs and cause
+  "Malformed API Key" floods (401 errors in agent gateway logs)
+- Verify: header value should match a valid LiteLLM key (test with `curl` against /v1/models)
+- Verify MCP access: test the MCP initialize handshake against the MCP endpoint (not just /v1/models)
+  ```bash
+  curl -s -X POST -H "x-litellm-api-key: Bearer <KEY>" -H "Accept: application/json, text/event-stream" \
+    https://litellm.sysloggh.net/mcp -d '{"jsonrpc":"2.0","id":1,"method":"initialize",...}' \
+    | jq '.data.result.serverInfo'  # should show serverInfo.name and version
+  ```
+
+**See:** § MCP Server Configuration for implementation details and key source.
 
 ## Execution