Open Source Social Image Generator

Deterministic social images for AI agents.

OSIG turns structured text, logos, and remote images into Open Graph and Twitter card images. Agents can inspect the template contract, render previews, and export image bytes without opening a design tool.

Agent first

The main workflow is MCP and API access for code agents working inside repositories.

Code generated

Images are deterministic, repeatable, and cheaper to revise than model-generated art.

Open source

Self-host the renderer, or use the hosted trial while production access evolves.

Start with MCP

Copy this into your AI agent.

The hosted MCP endpoint is currently available without authentication. Profile-key auth is expected before paid production MCP access.

Agent prompt

Use OSIG to generate deterministic Open Graph and social preview images for this project.

MCP server: https://osig.app/mcp/
Authentication: no API key is required for the current hosted trial.

Workflow:
1. Call get_image_contract to inspect supported templates, fields, and dimensions.
2. Call normalize_image_spec with structured title, subtitle, eyebrow, image_url, style, site, and format values.
3. Call render_image_preview to inspect image metadata and preview bytes. Iterate until the preview is ready.
4. Call export_image when the asset is ready to save into a repository or publishing workflow.

Use a profile key only if I provide one. Keep generated images deterministic and use preview before export.

Read docs GitHub