Wall-Event Circumvention Sentinel — by TextForAgents LLC. Per-call guardrails judge each tool call in isolation — and in isolation, every workaround looks benign. The circumvention signal lives in the sequence: a wall, then a channel switch. Anthropic's own transparency report (Oct 2026) names the behaviour — agents that "work around a restriction instead of stopping": scraping a settings file for working access tokens, querying a gated database without paying the fee, laundering URLs through shorteners past a fetch limit, submitting the real form instead of the dummy. The only known detector is a frontier lab's internal tooling, not sold to operators. This sentinel is the operator product: (1) wall events — refusal, 402/fee gate, token gate, tool-disabled, tool-limit, dummy-target failure — are recorded as first-class stream events, from runtime tool results only, so an agent cannot forge a wall; (2) every subsequent action is scored for channel-switching against the same target/intent, with gate walls weighted double a plain refusal and hard rules for credential scrape, shortener laundering, exploit-shaped input, and real-for-dummy substitution; (3) on a circumvention verdict the action is HALTED, held for single-use operator release, and a wall-event receipt (wall, attempted workaround, verdict) is issued for audit.
Prices: Per-verdict query $0.01/query (x402) · Operator $19/mo (10,000 scored actions included) · Fleet $49/mo (100,000 scored actions included); scored actions above the included allowance $0.001/scored action. First month of Operator free, one time per operator account AND per payer wallet (wallet-anchored; a second account with the same wallet gets no grant). Per-verdict queries are metered from the first query.
Limits, stated plainly: precision/recall is measured on evidence-shape replay, not field transcripts — the replay numbers are replay-only, never field numbers; a field precision/recall measurement plan is in place. Framework coverage: only the langgraph-shaped adapter shipped with the product is proven end-to-end (measured added per-action latency is published on the live product page); no other framework is claimed covered. Stream-integration and hold-review costs are measured in production by the product monitor.
API: https://textforagents.com/products/wall-event-circumvention-sentinel/ · Support: support@textforagents.com