This record as markdown: /tools/io-github-devopam-mcpg/walk-blocking-chains.md
What walk_blocking_chains does on Mcpg
AI agents call walk_blocking_chains to retrieve information from Mcpg without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why walk_blocking_chains is rated Low
The tool name suggests analyzing or traversing blocking chain data structures in PostgreSQL (likely related to lock blocking graphs), which is a diagnostic/informational operation with no side effects. Without a description, confidence is moderate, but the verb 'walk' and contextual similarity to sibling analysis tools indicate this is a Read operation. No modification, deletion, or code execution is implied.
From the tool's definition Tool name 'walk_blocking_chains' suggests traversal of blocking relationships in PostgreSQL; no description provided. The 'walk' verb typically implies inspection/traversal rather than modification. Related sibling tools (analyze_*) are all Read operations.
Attacks that exploit this kind of access
The rule that runs walk_blocking_chains safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Mcpg, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For walk_blocking_chains, this is the rule to start with:
walk_blocking_chains is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Mcpg, apply this rule, and every walk_blocking_chains call is checked against it from then on.
Questions about walk_blocking_chains
walk_blocking_chains is a read tool on the Mcpg MCP server. It is categorised as a Read tool in the Mcpg MCP Server, which means it retrieves data without modifying state.
Register the Mcpg MCP server in PolicyLayer and add a rule for walk_blocking_chains: 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 Mcpg. Nothing to install.
walk_blocking_chains is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the walk_blocking_chains 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 walk_blocking_chains. 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.
walk_blocking_chains is provided by the Mcpg MCP server (pypi:mcpg). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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