# wait_for_lsn A execute tool on the Mcpg MCP server. Agent View of the PolicyLayer registry record for `wait_for_lsn`. HTML page: https://policylayer.com/tools/io-github-devopam-mcpg/wait-for-lsn ## Facts - Tool: `wait_for_lsn` - Server: Mcpg (`pypi:mcpg`) — https://policylayer.com/tools/io-github-devopam-mcpg.md - Install: `npx -y pypi:mcpg` - Homepage: https://github.com/devopam/MCPg - Risk category: Execute (High risk) - Registry record: grade F, identity unverified - Server rate-limited: no - Parameters: 0 - Recommended policy verdict: Rate-limited ## Example call (MCP tools/call, JSON-RPC 2.0) ```json { "jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": { "name": "wait_for_lsn", "arguments": {} } } ``` ## Why wait_for_lsn is rated High LSN operations in PostgreSQL control replication synchronization and can affect database availability and transaction ordering. While not destructive or financial, executing such a tool could halt queries, affect failover behavior, or impact application performance depending on arguments. The empty description reduces confidence but the operational nature of LSN management justifies Execute category. From the tool's own definition: "Tool name 'wait_for_lsn' (Log Sequence Number) indicates it triggers a PostgreSQL operation that blocks or monitors replication state." ## Use case AI agents invoke wait_for_lsn to trigger actions in Mcpg. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started. ## Recommended policy (PolicyLayer) Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Mcpg: ```json { "version": "1", "default": "deny", "tools": { "wait_for_lsn": { "limits": [ { "counter": "wait_for_lsn_rate", "window": "minute", "max": 10, "scope": "grant" } ] } } } ``` ## Other tools on Mcpg (251) - `cancel_migration` — Destructive — https://policylayer.com/tools/io-github-devopam-mcpg/cancel-migration.md - `drop_graph` — Destructive — https://policylayer.com/tools/io-github-devopam-mcpg/drop-graph.md - `drop_property_graph` — Destructive — https://policylayer.com/tools/io-github-devopam-mcpg/drop-property-graph.md - `drop_publication` — Destructive — https://policylayer.com/tools/io-github-devopam-mcpg/drop-publication.md - `drop_subscription` — Destructive — https://policylayer.com/tools/io-github-devopam-mcpg/drop-subscription.md - `dump_database` — Destructive — https://policylayer.com/tools/io-github-devopam-mcpg/dump-database.md - `partman_drop_partition` — Destructive — https://policylayer.com/tools/io-github-devopam-mcpg/partman-drop-partition.md - `prune_audit_events` — Destructive — https://policylayer.com/tools/io-github-devopam-mcpg/prune-audit-events.md - `restore_database` — Destructive — https://policylayer.com/tools/io-github-devopam-mcpg/restore-database.md - `cancel_query` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/cancel-query.md - `cluster_vectors` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/cluster-vectors.md - `complete_migration` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/complete-migration.md - `dry_run_ddl` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/dry-run-ddl.md - `enable_extension` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/enable-extension.md - `enable_logical_replication_on_demand` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/enable-logical-replication-on-demand.md - `enable_redis_fdw` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/enable-redis-fdw.md - `generate_graph_projection` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/generate-graph-projection.md - `generate_test_data` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/generate-test-data.md - `hybrid_search` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/hybrid-search.md - `maintain_turboquant_index` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/maintain-turboquant-index.md - `mmr_search` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/mmr-search.md - `open_cursor` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/open-cursor.md - `optimize_query` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/optimize-query.md - `partman_run_maintenance` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/partman-run-maintenance.md - `pg_search_run` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/pg-search-run.md - `prepare_migration` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/prepare-migration.md - `prewarm_recommended` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/prewarm-recommended.md - `prewarm_relation` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/prewarm-relation.md - `recommend_redistribute` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/recommend-redistribute.md - `reindex_pg_search_index` — Execute — https://policylayer.com/tools/io-github-devopam-mcpg/reindex-pg-search-index.md - …and 221 more: https://policylayer.com/tools/io-github-devopam-mcpg.md ## For agents This record is a snapshot. Live verdicts and the full registry: - Check every server in your MCP config at once: `npx -y policylayer stack` - Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md) - Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events` --- Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-github-devopam-mcpg · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-github-devopam-mcpg