verify_audit_chain
Return an envelope's append-only audit-event hash chain together with a server-computed integrity verdict: every event_hash is recomputed from its canonical material, and the prev_event_hash linkage and per-envelope seq contiguity are checked. Evidence only, never PDF bytes. The raw events are in...
This record as markdown: /tools/com-free-sign-signing/verify-audit-chain.md
What verify_audit_chain does on FreeSign — Free e-signature
AI agents call verify_audit_chain to retrieve information from FreeSign — Free e-signature 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 |
|---|---|---|---|
envelope_id | string | Yes |
Parameters from the server's own tool schema.
Why verify_audit_chain is rated Low
This tool retrieves and verifies historical audit data without modifying it, generating no side effects. It provides transparency by returning raw events for independent validation rather than requiring trust in computed verdicts. This is a read-only verification function with minimal risk if misused—an agent could request verification of any envelope but cannot affect system state or data integrity.
From the tool's definition Tool returns audit-event hash chain and integrity verdict with raw events for independent verification. Explicitly states 'Evidence only, never PDF bytes.' No creation, modification, deletion, code execution, or financial operations performed.
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
The rule that runs verify_audit_chain 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 verify_audit_chain, this is the rule to start with:
verify_audit_chain 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 FreeSign — Free e-signature, apply this rule, and every verify_audit_chain call is checked against it from then on.
Questions about verify_audit_chain
Return an envelope's append-only audit-event hash chain together with a server-computed integrity verdict: every event_hash is recomputed from its canonical material, and the prev_event_hash linkage and per-envelope seq contiguity are checked. Evidence only, never PDF bytes. The raw events are included verbatim so the caller can independently re-derive the verdict instead of trusting chain.valid. It is categorised as a Read tool in the FreeSign — Free e-signature MCP Server, which means it retrieves data without modifying state.
verify_audit_chain accepts 1 parameter: envelope_id. Required: envelope_id. 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 verify_audit_chain: 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.
verify_audit_chain 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 verify_audit_chain 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 verify_audit_chain. 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.
verify_audit_chain 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.
More on FreeSign — Free e-signature, and thousands of servers like it.
This server
Across the catalogue