Critical-risk tools in Mcp
10 of the 571 tools in Mcp are classified as critical risk. This page profiles those tools specifically, with recommended policy actions and the attack patterns that target them.
Every operation listed below is an action PolicyLayer recommends controlling at the transport layer. Open any tool to see the full profile, risk score, and YAML policy snippet.
Tools at critical risk
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queue.ackDestructiveQUEUE: confirm a leased message is processed - deletes it...
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store.blob-deleteDestructiveSTORE: delete a file you uploaded, scoped to YOUR wallet...
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store.doc-deleteDestructiveSTORE: delete a stored document by id, scoped to YOUR wallet.
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store.kv-deleteDestructiveSTORE: delete a key/value you stored, scoped to YOUR wallet.
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store.vector-deleteDestructiveSTORE: delete a vector by id from a namespace, scoped to...
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watchers.cancelDestructiveCancel an active watcher by watcherId — it stops watching immediately. Flat-fee model: no refund of the unused window (nothing is held or owed). Idempotent. Pairs with watchers....
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predict.crypto-updownFinancialPolymarket crypto up/down markets (BTC/ETH/SPX hourly-daily directional).
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predict.walletFinancialA Polymarket trader
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watchers.fear-greedFinancialWATCHER: get a signed callback when the Crypto Fear & Greed index crosses a level (e.g. drops into Extreme Fear). Arm once, pay once. conditionType \
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watchers.fx-rateFinancialWATCHER: get a signed callback when an FX pair crosses a rate you set. Arm once, pay once. base + quote are 3-letter ISO currency codes (e.g. base USD, quote EUR). conditionType \
Attacks that target this class
Critical-risk tools in any server share these documented attack patterns. Each links to the full case and the defensive policy.