Return one JSON text chunk for a timeline session.
AI agents call get_timeline_chunk to retrieve information from Screen MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads and returns timeline data chunks without side effects. Although the data captured (screen recordings/timelines) could reveal sensitive information like passwords, credentials, or private content visible on screen, the tool itself only retrieves pre-captured data.
From the tool's definition get_timeline_chunk retrieves one JSON text chunk from a timeline session; no modification or deletion occurs. The server description emphasizes 'retrieves data' and 'chunked session-based transfers' indicating a read operation.
Attacks that exploit this kind of access
Return one JSON text chunk for a timeline session. It is categorised as a Read tool in the Screen MCP MCP Server, which means it retrieves data without modifying state.
Register the Screen MCP server in PolicyLayer and add a rule for get_timeline_chunk: 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 Screen MCP. Nothing to install.
get_timeline_chunk 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_timeline_chunk 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_timeline_chunk. 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_timeline_chunk is provided by the Screen MCP server (jeandelest/screen-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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