create_signing_envelope
Create a FreeSign envelope from a PDF SHA-256 hash. Do not send PDF bytes. The created envelope is NOT yet session-bound — the browser that opens the returned signing_url generates an ECDSA P-256 keypair locally and POSTs the public JWK to /api/envelopes/{id}/session-bind before any protected req...
This record as markdown: /tools/com-free-sign-signing/create-signing-envelope.md
What create_signing_envelope does on FreeSign — Free e-signature
AI agents use create_signing_envelope to create or update resources in FreeSign — Free e-signature, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your FreeSign — Free e-signature environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
document_sha256 | string | Yes | SHA-256 of the original PDF bytes, computed locally by the user or agent. |
Parameters from the server's own tool schema.
Why create_signing_envelope is rated Medium
This tool creates a new, persistent signing envelope bound to a document hash, which modifies server state irreversibly by registering a signing session. Although the envelope itself is not session-bound until a human uses the returned URL, the creation of the envelope is a Write operation.
From the tool's definition 'Create a FreeSign envelope' — the tool creates a new signing envelope object. The description confirms this is a creation operation ('create_signing_envelope') that produces a signing_url for downstream use.
Attacks that exploit this kind of access
The rule that runs create_signing_envelope safely
PolicyLayer is an MCP gateway: it sits between your AI agents and FreeSign — Free e-signature, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_signing_envelope, this is the rule to start with:
create_signing_envelope 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.
The button opens the PolicyLayer dashboard: create your workspace, connect FreeSign — Free e-signature, apply this rule, and every create_signing_envelope call is checked against it from then on.
Questions about create_signing_envelope
Create a FreeSign envelope from a PDF SHA-256 hash. Do not send PDF bytes. The created envelope is NOT yet session-bound — the browser that opens the returned signing_url generates an ECDSA P-256 keypair locally and POSTs the public JWK to /api/envelopes/{id}/session-bind before any protected request will succeed. AI agents calling this tool just hand the signing_url to a human, who continues in a browser. It is categorised as a Write tool in the FreeSign — Free e-signature MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
create_signing_envelope accepts 1 parameter: document_sha256. Required: document_sha256. The full parameter table on this page comes from the server's own tool schema.
Register the FreeSign — Free e-signature MCP server in PolicyLayer and add a rule for create_signing_envelope: 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 FreeSign — Free e-signature. Nothing to install.
create_signing_envelope is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_signing_envelope 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 create_signing_envelope. 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.
create_signing_envelope is provided by the FreeSign — Free e-signature MCP server (https://free-sign.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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