BLACK_WALL
https://mcp.blackwalltier.com/mcp ↗
Description
**BLACK_WALL** gives your agent a brake. It exposes a single tool, `forecast`, that the agent calls *before* any irreversible action — sending an email, making a payment, running SQL, deleting data, posting content. It returns: - a **risk score** (0–100) - a **reversibility class** + rollback cost (reversible / recoverable / irreversible) - a **gate**: proceed / confirm / human-required - named **red flags** from 28 documented failure modes (`SQL_NO_WHERE`, `INTENT_MISMATCH`, `CROSS_ENVIRONMENT`, `MASS_RECIPIENT`, `PROMPT_INJECTION_LIKELY`, …) A normal email clears in one call; a `DROP TABLE` on prod comes back **STOP / human-required** — before it runs. The agent can't talk itself into the bad action, because the verdict is a hard gate. **Setup:** paste your BLACK_WALL API key as the `apiKey` parameter. Get one free at https://blackwalltier.com (~100 forecasts/month, no card). A verdict takes ~4–8s. *A BLUETIER product.*
What our measurements say
BLACK_WALL is a remote MCP server published at mcp.blackwalltier.com. It has been probed 7 times since 9/10/2026. It answered in 7 of them (100.0%), a near-uninterrupted record. Median response time is 351 ms, placing it among the faster endpoints. It offers a narrow, focused set of 1 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Tool name 'forecast_payment' aligns with its pre-payment risk assessment purpose.
Weaknesses
- Tool description lacks explicit usage scenarios; parameters are ambiguously defined (e.g., 'free under $10 at risk' is unclear).
- No explicit error handling or constraints documented beyond vague 'red flags'.
forecast_payment— Parameter definitions are incomplete and ambiguous (e.g., 'Ed25519 signed receipt' lacks input schema details)forecast_payment— Truncated description ends mid-sentence ('over tha') without clarifying constraints or error scenarios
Verdict
Event narrative
Risk: medium
- 2026-09-10T21:16:35.016Z — era changed from auth-gated to legacy · indicates a shift in access control or compliance framework
- 2026-09-11T01:59:45.474Z — compliance score increased from null to 100 · suggests improved system integrity or policy adherence
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 48ms → warm 44ms (penalty 4ms)
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Server build: — → 0.1.0
- Supported versions: — → 2025-11-25
- Era changed: Auth-gated → Legacy
- Added to watch — era: Auth-gated
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