save_design_doc

SERVERDesign Doc Generator SOURCEdesign-doc-generator-mcp

Medium RISK CLASS

Category Write

Parameters 41 required

Recommended Rate-limitedsee the rule below

Registry record Grade B, identity unverified Pull the record →

This record as markdown: /tools/design-doc-generator-mcp/save-design-doc.md

WHAT IT DOES

What save_design_doc does on Design Doc Generator

AI agents use save_design_doc to create or update resources in Design Doc Generator, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Design Doc Generator environment.

Parameter	Type	Required	Description
`title`	string	—	Document title. Defaults to the first H1 in the markdown. Used for the HTML export's <title> and to build the default filename (docs/<title-slug>.md) when outpu
`markdown`	string	Yes	The complete, finished design doc as markdown.
`projectRoot`	string	—	Absolute path to the project root. Defaults to the server's cwd.
`outputRelativePath`	string	—	Relative path under docs/ to write to. Defaults to docs/<title-slug>.md.

Parameters from the server's own tool schema.

RISK

Why save_design_doc is rated Medium

This tool creates and modifies files (markdown and HTML documents) in a reversible manner. The 'overwrites/updates' language indicates modification, not deletion. While it does create persistent artifacts, the changes are not irreversible in nature—files can be edited or removed afterward. This is fundamentally a Write operation.

From the tool's definition Tool description states: 'Writes docs/<title-slug>.md' and 'beautified interactive HTML export alongside it' and 'Re-running this for the same topic overwrites/updates the same files by design'

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs save_design_doc safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Design Doc Generator, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For save_design_doc, this is the rule to start with:

save_design_doc Rate-limited

save_design_doc stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "save_design_doc": {
      "limits": [
        {
          "counter": "save_design_doc_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Design Doc Generator, apply this rule, and every save_design_doc call is checked against it from then on.

FAQ

Questions about save_design_doc

What does the save_design_doc tool do? +

Call this once with the finished markdown you drafted from prepare_design_doc's instructions. Writes docs/<title-slug>.md (adding a table of contents, splitting any oversized Mermaid diagrams, and applying consistent diagram styling) plus a beautified interactive HTML export alongside it - both always included, both available on the free tier. Re-running this for the same topic overwrites/updates the same files by design, rather than creating new ones each time. It is categorised as a Write tool in the Design Doc Generator MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does save_design_doc accept? +

save_design_doc accepts 4 parameters: title, markdown, projectRoot, outputRelativePath. Required: markdown. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on save_design_doc? +

Register the Design Doc Generator MCP server in PolicyLayer and add a rule for save_design_doc: 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 Design Doc Generator. Nothing to install.

What risk level is save_design_doc? +

save_design_doc is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit save_design_doc? +

Yes. Add a rate_limit block to the save_design_doc 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.

How do I block save_design_doc completely? +

Set action: deny in the PolicyLayer policy for save_design_doc. 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.

What MCP server provides save_design_doc? +

save_design_doc is provided by the Design Doc Generator MCP server (design-doc-generator-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Design Doc Generator, and thousands of servers like it.

This server

All 3 Design Doc Generator tools →

Across the catalogue

save_snapshot on Why Did You Render → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →