Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/openapi/openapi-skills/openapi-esignaturenpx skills add openapi/openapi-skills --skill openapi-esignaturegit clone --depth 1 https://github.com/openapi/openapi-skillsWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00063 | $0.00482 |
| Opus 5 | $0.00032 | $0.00241 |
| Sonnet 5 | $0.00013 | $0.00096 |
| Haiku 4.5 | $0.00006 | $0.00048 |
Grade A, and why
openapi-esignature scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Openapi eSignature & time stamping
Bearer token required (see the openapi-auth skill). Signing and stamping are paid, legally binding actions — confirm with the user before submitting documents.
eSignature — https://esignature.openapi.com
eIDAS-compliant signatures with European legal validity.
Signature types
POST /EU-SES— Simple Electronic Signature for one or more signers, secured via OTPPOST /EU-QES_otp— Qualified Electronic Signature with remote OTP certificatePOST /EU-QES_automatic— massive automatic QES (high volume)POST /EU-QES_eseal— qualified electronic seal (legal-entity seal)POST /verify— verify an existing signature
Certificates and results
POST /certificates/namirial-otp/POST /certificates/namirial-automatic— purchase signing certificatesGET /certificates,GET /certificates/{id}— list/inspect certificatesGET /signatures— list signature processesGET /signatures/{id}/{actionType}— download the signed document, details, audit trail, or validated documentDELETE /signatures/{id}— delete signature artifacts
Typical flow: ensure a certificate exists → create the signature request with the PDF and signer details → signers complete via OTP where applicable → download the signed document and audit trail.
Time Stamping (Marche Temporali) — https://ws.marchetemporali.com
Purchase qualified timestamps and apply them to documents (buy batches, stamp a document, verify stamps).
Legacy Digital Signature (ws.firmadigitale.com — Infocert/Aruba kits) is deprecated; use eSignature for new integrations.
Full specs: https://console.openapi.com/oas/en/esignature.openapi.json · https://console.openapi.com/oas/en/marchetemporali.openapi.json
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 38 lines · 63 tokens per session scan A 5e4a6fa67161
openapi-esignature is a skill published in the GitHub repository openapi/openapi-skills (2 stars, last pushed 2mo ago), licensed MIT. It adds 63 tokens to every session and 482 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
openapi-glossary
Use consistent OpenAPI terminology and definitions when writing documentation, educational material, and tooling guidance.
scalar-docs
Skill for writing and updating scalar.config.json — Scalar Docs configuration reference for users and LLMs.
scalar-design-system
Scalar's design system — design tokens, theming (@scalar/themes), CSS variables, and the @scalar/components library. Use when designing or implementing Scalar UI, especially with Paper (code-to-design / design-to-code), so output matches real Scalar tokens, colors, typography, spacing, and components instead of…
cloud-agents-starter
Minimal starter runbook for cloud agents to install dependencies, run packages, execute tests, and troubleshoot the Scalar monorepo quickly.
mock-server
Build, customize, and troubleshoot OpenAPI mock servers with @scalar/mock-server, including x-handler, x-seed, authentication, and Docker.
tests
Write clear, maintainable Vitest and Playwright tests with precise assertions, consistent structure, and strong behavioral coverage.