# local_ydb_scheme

Read-only YDB scheme list or describe with capped stdout/stderr. It uses the root database for rootDatabase paths and the tenant database otherwise; list supports recursive/long/onePerLine flags, describe supports stats, and incompatible flag combinations are rejected.

Agent View of the PolicyLayer registry record for `local_ydb_scheme`. HTML page: https://policylayer.com/tools/local-ydb/local-ydb-scheme

## Facts

- Tool: `local_ydb_scheme`
- Server: Local Ydb (`@astandrik/local-ydb-mcp`) — https://policylayer.com/tools/local-ydb.md
- Install: `npx -y @astandrik/local-ydb-mcp`
- Homepage: git+https://github.com/astandrik/local-ydb-toolkit.git
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "local_ydb_scheme",
    "arguments": {}
  }
}
```

## Why local_ydb_scheme is rated Low

The tool retrieves schema information from a YDB database (list or describe operations on the scheme). It has no capability to modify, delete, or execute operations - it only reads and returns data. The 'read-only' designation and the nature of 'list' and 'describe' operations confirm this is purely informational retrieval with no side effects or blast radius beyond information disclosure.

From the tool's own definition: "'Read-only YDB scheme list or describe' - the tool explicitly states it is read-only and performs listing and describe operations, which are query/retrieval operations without side effects."

Risk signals: Admin/system-level operation

## Use case

AI agents call local_ydb_scheme to retrieve information from Local Ydb without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Local Ydb:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "local_ydb_scheme": {}
  }
}
```

## Other tools on Local Ydb (37)

- `local_ydb_cleanup_storage` — Destructive — https://policylayer.com/tools/local-ydb/local-ydb-cleanup-storage.md
- `local_ydb_destroy_stack` — Destructive — https://policylayer.com/tools/local-ydb/local-ydb-destroy-stack.md
- `local_ydb_remove_dynamic_nodes` — Destructive — https://policylayer.com/tools/local-ydb/local-ydb-remove-dynamic-nodes.md
- `local_ydb_add_dynamic_nodes` — Execute — https://policylayer.com/tools/local-ydb/local-ydb-add-dynamic-nodes.md
- `local_ydb_apply_auth_hardening` — Execute — https://policylayer.com/tools/local-ydb/local-ydb-apply-auth-hardening.md
- `local_ydb_bootstrap` — Execute — https://policylayer.com/tools/local-ydb/local-ydb-bootstrap.md
- `local_ydb_bootstrap_root_database` — Execute — https://policylayer.com/tools/local-ydb/local-ydb-bootstrap-root-database.md
- `local_ydb_check_prerequisites` — Execute — https://policylayer.com/tools/local-ydb/local-ydb-check-prerequisites.md
- `local_ydb_pull_image` — Execute — https://policylayer.com/tools/local-ydb/local-ydb-pull-image.md
- `local_ydb_restart_stack` — Execute — https://policylayer.com/tools/local-ydb/local-ydb-restart-stack.md
- `local_ydb_start_dynamic_node` — Execute — https://policylayer.com/tools/local-ydb/local-ydb-start-dynamic-node.md
- `local_ydb_upgrade_version` — Execute — https://policylayer.com/tools/local-ydb/local-ydb-upgrade-version.md
- `local_ydb_auth_check` — Read — https://policylayer.com/tools/local-ydb/local-ydb-auth-check.md
- `local_ydb_container_logs` — Read — https://policylayer.com/tools/local-ydb/local-ydb-container-logs.md
- `local_ydb_database_status` — Read — https://policylayer.com/tools/local-ydb/local-ydb-database-status.md
- `local_ydb_dump_tenant` — Read — https://policylayer.com/tools/local-ydb/local-ydb-dump-tenant.md
- `local_ydb_generate_schema` — Read — https://policylayer.com/tools/local-ydb/local-ydb-generate-schema.md
- `local_ydb_graphshard_check` — Read — https://policylayer.com/tools/local-ydb/local-ydb-graphshard-check.md
- `local_ydb_healthcheck` — Read — https://policylayer.com/tools/local-ydb/local-ydb-healthcheck.md
- `local_ydb_inventory` — Read — https://policylayer.com/tools/local-ydb/local-ydb-inventory.md
- `local_ydb_list_dumps` — Read — https://policylayer.com/tools/local-ydb/local-ydb-list-dumps.md
- `local_ydb_list_versions` — Read — https://policylayer.com/tools/local-ydb/local-ydb-list-versions.md
- `local_ydb_nodes_check` — Read — https://policylayer.com/tools/local-ydb/local-ydb-nodes-check.md
- `local_ydb_pull_status` — Read — https://policylayer.com/tools/local-ydb/local-ydb-pull-status.md
- `local_ydb_reduce_storage_groups` — Read — https://policylayer.com/tools/local-ydb/local-ydb-reduce-storage-groups.md
- `local_ydb_status_report` — Read — https://policylayer.com/tools/local-ydb/local-ydb-status-report.md
- `local_ydb_storage_leftovers` — Read — https://policylayer.com/tools/local-ydb/local-ydb-storage-leftovers.md
- `local_ydb_storage_placement` — Read — https://policylayer.com/tools/local-ydb/local-ydb-storage-placement.md
- `local_ydb_tenant_check` — Read — https://policylayer.com/tools/local-ydb/local-ydb-tenant-check.md
- `local_ydb_add_storage_groups` — Write — https://policylayer.com/tools/local-ydb/local-ydb-add-storage-groups.md
- …and 7 more: https://policylayer.com/tools/local-ydb.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=local-ydb · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/local-ydb