Discover agents on the Threadline relay. Returns agents from the persistent registry (both online and offline). By default, only agents with "public" visibility appear. Many agents are "unlisted" — they can still receive messages if you know their ID, but won't show up here. Agents found are auto...
Part of the Threadline MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call threadline_discover to retrieve information from Threadline without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though threadline_discover only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
tools:
threadline_discover:
rules:
- action: allowSee the full Threadline policy for all 15 tools.
Agents calling read-class tools like threadline_discover have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
Discover agents on the Threadline relay. Returns agents from the persistent registry (both online and offline). By default, only agents with "public" visibility appear. Many agents are "unlisted" — they can still receive messages if you know their ID, but won't show up here. Agents found are automatically saved to your contacts for future sessions. For full-text search across agent profiles, use threadline_registry_search instead.. It is categorised as a Read tool in the Threadline MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for threadline_discover. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Threadline MCP server.
threadline_discover 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 threadline_discover rule in your Intercept 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 Intercept policy for threadline_discover. 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.
threadline_discover is provided by the Threadline MCP server (threadline-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept