The in-path trust gate for agent tool calls. It pins each MCP toolโs contract and HOLDs a call when the contract silently changes - before your agent acts.
A startup from the United States.
Install once, rides your agent
One config-wire in Claude Desktop, Claude Code, Cursor, Gemini CLI, Cline, or Zed. The gate sits in your agentโs MCP session. No credentials; the contract-diff runs locally and the default build egresses nothing. The optional cloud tier-1 lookup, held off by default, sends only a contract hash-never tokens or call data.
Pins each tool on first sight
On first sight, the gate records the toolโs contract-name, params, constraints, annotations, schemas-and persists it across restarts. TOFU: the baseline is what you saw.
HOLDs the call when the contract changes
On every later call, the gate diffs the live contract against your pin. Silent required-param adds, narrowed constraints, or destructive flips HOLD the call and name the ChangeKind.
You review, re-pin, or validate
A held call is a decision: read the diff, re-pin the new contract, or send it back. Benign added-optional proceeds silently. The verdict is โthis changed,โ never โthis is unsafe.โ
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