# FreeSign — Free e-signature (remote · free-sign.com)

Free e-signature for humans and AI agents — zero-document PDF signing from hashes only.

- Trust score: 64/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `free-sign.com`: 64/100 (this document), [markdown](https://verifymcp.io/servers/com-free-sign-signing/free-sign.md), [page](https://verifymcp.io/servers/com-free-sign-signing/free-sign)

## Channel facts

- Endpoint: `https://free-sign.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 5 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 71/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 421 tokens (~84/item across 5 items; 5 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 76/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 17% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http com-free-sign-signing https://free-sign.com/mcp
```

### Codex

```toml
[mcp_servers.com-free-sign-signing]
url = "https://free-sign.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-free-sign-signing": {
      "type": "remote",
      "url": "https://free-sign.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-free-sign-signing --url https://free-sign.com/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-free-sign-signing:
    url: "https://free-sign.com/mcp"
```

### Other

```json
{
  "mcpServers": {
    "com-free-sign-signing": {
      "type": "http",
      "url": "https://free-sign.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-03 (score 64, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 63, +2)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 61, −1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-29 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-27 (score 61, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 60)

First indexed and scored.

## MCP tools (5)

### `create_signing_envelope` (~128 tokens)

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.

Input parameters:

- `document_sha256` (string, required): SHA-256 of the original PDF bytes, computed locally by the user or agent.

Output parameters:

- `envelope_id` (string)
- `expires_at` (string)
- `session_binding_required` (boolean): True when the envelope still needs the browser to call /api/envelopes/{id}/session-bind. Always true for MCP-created envelopes.
- `signing_url` (string)

### `verify_document_hash` (~31 tokens)

Verify document hash

Find FreeSign receipts matching a local document SHA-256 hash.

Input parameters:

- `document_sha256` (string, required)

Output parameters:

- `matches` (array)

### `get_receipt` (~58 tokens)

Get receipt

Return the envelope record (including final_pdf_sha256, final_signature_base64url, final_payload_json), per-signer signing receipts, and OpenTimestamps anchor metadata. Evidence only, never PDF bytes.

Input parameters:

- `envelope_id` (string, required)

Output parameters:

- `envelope` (object)
- `ots_anchors` (array)
- `receipts` (array)

### `get_ots_proof` (~109 tokens)

Get OpenTimestamps proof

Return the .ots proof (base64) for a given OpenTimestamps anchor on an envelope. Use the official `ots-cli` to verify offline against Bitcoin block headers. Each seal has two anchors: `kind: "byterange"` commits to the signed document, `kind: "signed_attrs"` commits to SHA-256 of the CMS SignedAttributes (which carry the post-quantum key commitment).

Input parameters:

- `anchor_id` (string, required)
- `envelope_id` (string, required)

Output parameters:

- `anchor_id` (string)
- `anchored_hash` (string)
- `btc_block_hash` (string|null)
- `btc_block_height` (integer|null)
- `calendar_urls` (array)
- `envelope_id` (string)
- `kind` (string)
- `proof_base64` (string): Complete .ots file bytes, base64.
- `status` (string)

### `verify_audit_chain` (~95 tokens)

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`.

Input parameters:

- `envelope_id` (string, required)

Output parameters:

- `attested_audit_chain_head_hash` (string|null): The audit-chain head derived from the signer-signed v2 final payload (G-01), fed into the verdict's head cross-check. NULL until the envelope is finalized.
- `attested_head_signature_verified` (boolean): True when the final-payload signature carrying the attested head was re-verified against the signer's on-file public key. False when not finalized or the signature did not verify.
- `chain` (object)
- `envelope_id` (string)
- `events` (array)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-free-sign-signing/free-sign#diagnostics

## Score history

- 2026-08-03: 64
- 2026-08-02: 63
- 2026-08-01: 63
- 2026-07-31: 63
- 2026-07-30: 61
- 2026-07-29: 62
- 2026-07-28: 61
- 2026-07-27: 61
- 2026-07-26: 60

## Links

- Remote endpoint: https://free-sign.com/mcp
- Website: https://free-sign.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-free-sign-signing/free-sign/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-free-sign-signing/free-sign/changelog.json
- HTML version of this page: https://verifymcp.io/servers/com-free-sign-signing/free-sign