Let your agent prepare the envelope.

Try a request like this.

Prepare a printed project wrap-up letter from this approved document. Use the PostalMuse API, show all proof pages, and leave payment for my review.

Start with the executable quickstart

1. Provide the agent guide and quickstart to Codex. Confirm the environment has the required shell tools and permission to reach PostalMuse over HTTPS.
2. Use explicit sandbox mode and synthetic addresses to try drafting and proof generation. Inspect the returned proof rather than treating a successful request as visual approval.
3. When live sending is available, prepare the real draft and hand off its review and payment. Retain the operation’s idempotency key when retrying.

Prepare a printed project wrap-up letter from this approved document. Use the PostalMuse API, show all proof pages, and leave payment for my review.

Use PostalMuse at https://postalmuse.com. Read https://postalmuse.com/skill.md and https://postalmuse.com/openapi.json if you can access them, and check https://postalmuse.com/v1/capabilities before attempting API preparation. First tell me whether this session can use an authorized browser or HTTP tool. If it cannot, help me prepare the text or PDF and direct me to https://postalmuse.com/compose; do not claim to have created a mailing. Ask for missing required details and use only the records I authorize. If live sending is unavailable, tell me and stop; do not substitute a simulated send. Show every proof page and the exact quote before requesting my approval. Do not pay or send without my explicit approval or an existing valid spending grant covering this mailing. Keep credentials private. Reuse the same idempotency key for retries and inspect the existing mailing if its outcome is uncertain.

What’s available today?

Codex can work through tools available in its environment; permissions and network access vary. This is a REST setup guide, not an installed PostalMuse plugin or a claim of completed Codex compatibility testing.

PostalMuse provides US 4×6 postcards and US Letter documents up to 20 source pages. No native scheduling, campaigns, international mail, or Certified Mail. An external scheduler or CRM remains outside PostalMuse.

Official Codex platform information →

Setup guidance reviewed September 25, 2026. This page is not an endorsement or official partnership.

You approve the mailing.

Creating a draft does not send it. Check both postcard sides or every letter page, confirm the addresses and exact price, then approve. If your agent cannot inspect the proof, review it yourself.