feat(library): add n8n alternatives, LangGraph alternatives, and open-source AI agent platform listings

[waleedlatif1]

Summary

• Add three new SEO library listings: /library/n8n-alternatives, /library/open-source-ai-agent-platforms, /library/langgraph-alternatives
• Generate matching OG covers (1200x675, Season Sans at weight 500) using the same card template as the docs OG route and existing library covers
• Frontmatter validated against ContentFrontmatterSchema; registry auto-discovers the posts, no code changes needed
• Copy follows the language constitution (Chat/Sim naming, no banned terms)

Type of Change

• New feature (content)

Testing

Validated frontmatter against the registry Zod schema, confirmed getAllPostMeta/getPostBySlug load and compile all three posts, and visually compared generated covers against the best-zapier-alternatives reference.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Jul 13, 2026 6:01pm

[cursor]

PR Summary

Low Risk
Mostly marketing MDX plus a small, backward-compatible SEO metadata change; scan-time file reads only affect local OG images and fail safely to the previous defaults.

Overview
Adds three new library articles (/library/n8n-alternatives, /library/langgraph-alternatives, /library/open-source-ai-agent-platforms) as standard index.mdx posts with canonical URLs, tags, and local cover.jpg paths—picked up by the existing library registry without route changes.

Extends the shared content pipeline so local ogImage files under public/ are read at scan time via image-size, storing optional ogImageWidth / ogImageHeight on ContentMeta. buildPostMetadata and buildArticleJsonLd now emit those dimensions for Open Graph and schema.org, still defaulting to 1200×630 when the image is remote or unreadable (e.g. non-1200×675 covers).

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[greptile-apps]

Greptile Summary

This PR adds new SEO library content and updates cover image metadata handling. The main changes are:

• Three new library articles for n8n, LangGraph, and open-source AI agent platform comparisons.
• Matching local cover images for the new library listings.
• Content registry support for reading local cover image dimensions.
• SEO metadata updates to use measured image dimensions when available.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
apps/sim/lib/content/registry-factory.ts	Adds local cover image dimension probing during content metadata scans.
apps/sim/lib/content/schema.ts	Adds optional computed image dimension fields to content metadata.
apps/sim/lib/content/seo.ts	Uses computed image dimensions in OpenGraph and Article JSON-LD metadata.
apps/sim/package.json	Adds the image dimension reader dependency.
apps/sim/content/library/langgraph-alternatives/index.mdx	Adds the LangGraph alternatives library article.
apps/sim/content/library/n8n-alternatives/index.mdx	Adds the n8n alternatives library article.
apps/sim/content/library/open-source-ai-agent-platforms/index.mdx	Adds the open-source AI agent platforms library article.

_{Reviews (2): Last reviewed commit: "fix(content): declare actual OG image di..." | Re-trigger Greptile}

[waleedlatif1]

@greptile

[waleedlatif1]

@cursor review

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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