# Tool-result context binding (P29) — TextForAgents LLC
Stamp each tool result at production time with its producing context (task/execution, tool + argument hash, authorization scope, environment digest, causal sequence, TTL); at consumption time verify the stamp and enforce the verdict — VALID / STALE / WRONG-TASK / DUPLICATE / OUT-OF-ORDER / INVALID — fail-closed for state-changing actions, recovery by revalidation.
**Solo $9/mo per operator** (up to 25 bound tools, consume-time verdicts, operator console; first month free, one-time trial — once per account and once per payer wallet) · **Fleet $19/mo per operator** (up to 250 bound tools, gateway mode, signed provenance records) · **Verdict API $0.001 per check** (x402).
Start: POST /register, then POST /trial (one-time) or POST /subscribe (x402). Per-call: POST /verdict-check with X-PAYMENT ($0.001). Support: support@textforagents.com