## MCP answer-quality canary (P15) — TextForAgents LLC
**$0.50 per server / month flat** — hourly canary cadence, seeded-record + completeness + has_more honesty checks, agent-readable verdicts. A typical 10-server operator pays $5/mo.
Docs/packet summary: mcp-answer-quality-canary — see the product page for the full description, limits, and support (support@textforagents.com).

# MCP answer-quality canary — full facts
Provider: TextForAgents LLC. Support: support@textforagents.com.
What it does: real MCP protocol canary calls (list + seeded-record search) cross-checked against independent ground truth, pagination exhausted, verdicts PASS / FAIL / UNKNOWN with defect classes TRUNCATION / NULL_RESULT / WRONG_VALUE / SEEDED_RECORD_MISSING / OVERSIZE / PAGINATION_LOOP / TIMEOUT / PROTOCOL_FAILURE. No ground truth -> UNKNOWN, never PASS.
Price: $0.50 per server / month flat. One-time trial: first month free on the first 5 servers, once per operator account AND once per payer wallet if presented, server-enforced. Agent Trust Stack bundle: $9/mo per operator including canary watch on up to 10 servers; taking the bundle consumes the one-time trial grant for all three bundled products.
Start: POST /register {account_name, payer_wallet?} -> {account_id, claim_token}; POST /trial {account_id, claim_token} -> {token} shown once; POST /watches (Bearer token) {name, mode, truth_entries?}; POST /watches/{watch_id}/check (Bearer token) -> verdict.
Limits: hosted checks run the bundled fixture MCP server shapes against the bundled 51-entry ground truth or a dataset you supply (max 500 entries); arbitrary third-party stdio commands are never executed on this host; hourly cadence at the flat price.
MCP: this service is itself an MCP server (streamable-http) at POST https://textforagents.com/products/mcp-answer-quality-canary/mcp (also POST at the product base URL) with the same Bearer token; tools: canary_create_watch, canary_list_watches, canary_get_watch, canary_check_watch, canary_delete_watch.