Server data from the Official MCP Registry
Pre-action risk gate: AI agents call before any irreversible action (money, SQL, delete).
Pre-action risk gate: AI agents call before any irreversible action (money, SQL, delete).
Valid MCP server (2 strong, 3 medium validity signals). 3 known CVEs in dependencies (0 critical, 3 high severity) Imported from the Official MCP Registry. 1 finding(s) downgraded by scanner intelligence.
3 files analyzed · 4 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
This plugin requests these system permissions. Most are normal for its category.
Set these up before or after installing:
Environment variable: BLACKWALL_API_KEY
Environment variable: BLACKWALL_MODE
Add this to your MCP configuration file:
{
"mcpServers": {
"com-blackwalltier-blackwall": {
"env": {
"BLACKWALL_MODE": "your-blackwall-mode-here",
"BLACKWALL_API_KEY": "your-blackwall-api-key-here"
},
"args": [
"-y",
"blackwall-mcp"
],
"command": "npx"
}
}
}From the project's GitHub README.
A guardrail for AI agents, as an MCP server. Your agent calls one tool — forecast — before any irreversible action (send email, move money, run SQL, delete data, post content). It gets back a risk score (0–100), a GO / CAUTION / STOP recommendation, and named red flags in ~sub-second.
Works in any MCP host: Claude Desktop, Claude Code, Cursor, Windsurf, ChatGPT (Apps SDK), and any agent framework with MCP support.
The wall between your agent and disaster. A BLUETIER product.
Sign up free at https://blackwalltier.com → Dashboard → API keys → Create key.
Free tier: 100 forecasts/month, no card. Your key looks like bw_live_….
Edit claude_desktop_config.json (Settings → Developer → Edit Config):
{
"mcpServers": {
"blackwall": {
"command": "npx",
"args": ["-y", "blackwall-mcp"],
"env": { "BLACKWALL_API_KEY": "bw_live_your_key_here" }
}
}
}
Restart Claude Desktop. You'll see a forecast tool available.
Settings → MCP → Add new global MCP server, then in mcp.json:
{
"mcpServers": {
"blackwall": {
"command": "npx",
"args": ["-y", "blackwall-mcp"],
"env": { "BLACKWALL_API_KEY": "bw_live_your_key_here" }
}
}
}
claude mcp add blackwall -e BLACKWALL_API_KEY=bw_live_your_key_here -- npx -y blackwall-mcp
BLACKWALL_API_KEY=bw_live_your_key_here npx -y blackwall-mcp
Once added, instruct your agent: "Before any irreversible action, call the forecast tool and stop if it returns STOP." The model will call it automatically when it's about to do something risky.
forecast tool| Parameter | Type | Required | Description |
|---|---|---|---|
action | string | ✅ | The action type, e.g. send_email, make_payment, run_sql, delete_file, post_content |
inputs | object | ✅ | Concrete parameters: recipient, amount_usd, SQL statement, file path, message body, URL, etc. |
context | object | — | Optional: { agent_role, user_intent, environment } |
depth | standard | deep | — | Analysis depth. standard is the default. |
Returns: recommendation (GO/CAUTION/STOP), risk_score (0–100), confidence, red_flags[], predicted_result, alternative_actions[].
Agent about to run DELETE FROM users; (no WHERE clause) →
🛑 BLACK_WALL: STOP — risk 99/100
Red flags:
• [CRITICAL] SQL_NO_WHERE — deletes the entire table, not one row
• [CRITICAL] INTENT_MISMATCH — intent was "remove a single test row"
• [CRITICAL] IRREVERSIBLE_NO_BACKUP — no recovery path
Guidance: DO NOT take this action. Surface the red flags to the user.
Not ready to let a guardrail block your agents? Start in observe mode. It scores and logs every action but never tells the agent to stop — your agents behave exactly as they do today. After a week, run the digest and see what it would have caught.
{
"mcpServers": {
"blackwall": {
"command": "npx",
"args": ["-y", "blackwall-mcp"],
"env": {
"BLACKWALL_API_KEY": "bw_live_your_key_here",
"BLACKWALL_MODE": "observe"
}
}
}
}
Then see "what your agents almost did" in your dashboard. Flip BLACKWALL_MODE to enforce (or just remove it — enforce is the default) when you're ready to actually block.
| Env var | Required | Default | Notes |
|---|---|---|---|
BLACKWALL_API_KEY | ✅ | — | bw_live_… from your dashboard |
BLACKWALL_BASE_URL | — | https://blackwalltier.com | |
BLACKWALL_MODE | — | enforce | observe = log only, never block |
MIT licensed.
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