canvas_inspect_media
读取音视频配置、候选、运行阶段、输入连线和可运行准备状态；expectedRevision 固定审核基线，失败返回 readError。不播放、不解码，metadataOnly 不表示已观看或听取内容。
This record as markdown: /tools/dutydeck/canvas-inspect-media.md
What canvas_inspect_media does on DutyDeck
AI agents call canvas_inspect_media to retrieve information from DutyDeck without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Why canvas_inspect_media is rated Low
Even though canvas_inspect_media 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.
Attacks that exploit this kind of access
The rule that runs canvas_inspect_media safely
PolicyLayer is an MCP gateway: it sits between your AI agents and DutyDeck, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For canvas_inspect_media, this is the rule to start with:
canvas_inspect_media 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 DutyDeck, apply this rule, and every canvas_inspect_media call is checked against it from then on.
Questions about canvas_inspect_media
读取音视频配置、候选、运行阶段、输入连线和可运行准备状态；expectedRevision 固定审核基线，失败返回 readError。不播放、不解码，metadataOnly 不表示已观看或听取内容。. It is categorised as a Read tool in the DutyDeck MCP Server, which means it retrieves data without modifying state.
Register the DutyDeck MCP server in PolicyLayer and add a rule for canvas_inspect_media: 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 DutyDeck. Nothing to install.
canvas_inspect_media 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 canvas_inspect_media 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 canvas_inspect_media. 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.
canvas_inspect_media is provided by the DutyDeck MCP server (taokoplay/DutyDeck). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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