valv
Let coding agents query any SQL database safely. Read-only by default and scoped by your policies.
Using valv in Claude, Cursor, Gemini CLI, Cline, or Zed?
MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).
Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less
uv tool install mcpindex-gate && mcpindex-config-wireVerdict not yet evaluated for this tool. The semantic screen takes adversarial cases first; coverage rolls out as the corpus expands (15/150 labels to graduation). The deterministic conformance probe is built but has not yet run on the public corpus, so a recorded verdict here is REVIEW or UNVERIFIED, never a clearing ALLOW. Until a verdict is recorded, an agent should treat this tool as not-yet-cleared and fall back to its own checks. Method: the eval, four-state verdict, honest limits.
Own this server? Screen its description →
That verdict was true at screening time (snapshot 2026-07-28).
Contracts can change after screening, with no version bump. The gate pins valv’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.
See your first HOLD in 2 minutes →
Related: how to trust an MCP server · screen before install · silent contract drift
DATABASE_URLDatabase connection string. PostgreSQL, MySQL, SQLite, CockroachDB, or a ClickHouse HTTP URL.
VALV_PROVIDERDatasource provider: postgresql, mysql, sqlite, or clickhouse. Inferred from DATABASE_URL when omitted.
VALV_DATABASEDatabase name. Required for ClickHouse, whose URL does not carry one.
VALV_TABLESComma-separated allow-list of tables. When set, only these are exposed to the agent.
VALV_EXCLUDEComma-separated deny-list of tables, applied after the allow-list.
VALV_POLICY_FILEPath to a policy module that takes full control of access. Without it, the server is read-only across all tables.
VALV_CONTEXTJSON context object the policy reads, e.g. {"tenant":{"id":"acme"}}.
VALV_HTTP_PORTServe over Streamable HTTP on this port instead of stdio.
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