AI agents call get-post to retrieve information from Bluesky without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves data from Bluesky (a specific post by its URI) without modifying, deleting, or executing any operations. It is a read-only operation with minimal security risk. The low severity reflects that unauthorized data retrieval of public posts has limited blast radius, though it could expose unwanted access to private posts if authorization controls are weak.
From the tool's definition Tool name 'get-post' and description 'Get a specific post by URI' indicate a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access get-post gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Bluesky, and nothing reaches the server without passing your rules. This is the rule we recommend for get-post:
{
"version": "1",
"default": "deny",
"tools": {
"get-post": {}
}
}get-post is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Get a specific post by URI. It is categorised as a Read tool in the Bluesky MCP Server, which means it retrieves data without modifying state.
Register the Bluesky MCP server in PolicyLayer and add a rule for get-post: 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 Bluesky. Nothing to install.
get-post 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 get-post 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 get-post. 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.
get-post is provided by the Bluesky MCP server (semioz/bluesky-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Bluesky, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
11 Bluesky tools catalogued and risk-classified — across an index of 43,000+ MCP servers.