read_display_html
Reads the raw HTML source currently shown on a display so you can inspect or edit it and push it back with send_html. content_type 'idle' reads the default/fallback content instead. Responses are windowed for large documents: max_bytes (default 51200) and offset page through the source; the resul...
This record as markdown: /tools/de-agentview-agentview-mcp/read-display-html.md
What read_display_html does on agentView
AI agents call read_display_html to retrieve information from agentView without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
offset | integer | — | Byte offset to start reading from. Default 0. |
max_bytes | integer | — | Maximum bytes of HTML to return. Default 51200. |
display_id | string | Yes | 8-character display profile ID, e.g. 'ABCD1234'. |
access_token | string | — | Optional bearer token; prefer session_request_id. |
content_type | string | — | 'live' (default) reads active content; 'idle' reads default content. |
session_request_id | string | — | Session handle from create_auth_session; pass it on every authenticated call. |
Parameters from the server's own tool schema.
Why read_display_html is rated Low
Even though read_display_html only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Risk signalsHandles credentials or secrets (access_token)
Attacks that exploit this kind of access
The rule that runs read_display_html safely
PolicyLayer is an MCP gateway: it sits between your AI agents and agentView, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For read_display_html, this is the rule to start with:
read_display_html 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 agentView, apply this rule, and every read_display_html call is checked against it from then on.
Questions about read_display_html
Reads the raw HTML source currently shown on a display so you can inspect or edit it and push it back with send_html. content_type 'idle' reads the default/fallback content instead. Responses are windowed for large documents: max_bytes (default 51200) and offset page through the source; the result reports totalBytes and truncated. Not for visual previews (use get_display_preview_url). Requires content scope. It is categorised as a Read tool in the agentView MCP Server, which means it retrieves data without modifying state.
read_display_html accepts 6 parameters: offset, max_bytes, display_id, access_token, content_type, session_request_id. Required: display_id. The full parameter table on this page comes from the server's own tool schema.
Register the agentView MCP server in PolicyLayer and add a rule for read_display_html: 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 agentView. Nothing to install.
read_display_html 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 read_display_html 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 read_display_html. 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.
read_display_html is provided by the agentView MCP server (https://agentview.de/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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