local_ydb_start_dynamic_node
Start the configured primary dynamic tenant node for an existing CMS tenant. Before returning or executing a plan, it rejects a primary name that aliases the static container and ports that collide in the shared network namespace, including static IC port 19001. After checking that the image is p...
This record as markdown: /tools/local-ydb/local-ydb-start-dynamic-node.md
What local_ydb_start_dynamic_node does on Local Ydb
AI agents invoke local_ydb_start_dynamic_node to trigger actions in Local Ydb. 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.
Why local_ydb_start_dynamic_node is rated High
Starts a dynamic container node, triggering external infrastructure operations with significant blast radius.
From the tool's definition Start the configured primary dynamic tenant node, container is created
Risk signalsAdmin/system-level operation
Attacks that exploit this kind of access
The rule that runs local_ydb_start_dynamic_node safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Local Ydb, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For local_ydb_start_dynamic_node, this is the rule to start with:
local_ydb_start_dynamic_node stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Local Ydb, apply this rule, and every local_ydb_start_dynamic_node call is checked against it from then on.
Questions about local_ydb_start_dynamic_node
Start the configured primary dynamic tenant node for an existing CMS tenant. Before returning or executing a plan, it rejects a primary name that aliases the static container and ports that collide in the shared network namespace, including static IC port 19001. After checking that the image is present, it runs the full check-only static compatibility preflight, including the current image ID, immediately before the dynamic container start; a mismatch fails closed and requires destroy followed by bootstrap. The dynamic container is created but not started until its resolved image ID matches the static container, closing a concurrent named-tag refresh race. Use after local_ydb_create_tenant or when admin status is PENDING_RESOURCES; use local_ydb_add_dynamic_nodes for extra nodes. Without confirm=true this returns a plan only. It is categorised as a Execute tool in the Local Ydb MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Local Ydb MCP server in PolicyLayer and add a rule for local_ydb_start_dynamic_node: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Local Ydb. Nothing to install.
local_ydb_start_dynamic_node is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the local_ydb_start_dynamic_node rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for local_ydb_start_dynamic_node. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
local_ydb_start_dynamic_node is provided by the Local Ydb MCP server (@astandrik/local-ydb-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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