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 localogImage 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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^{Reviewed by Cursor Bugbot for commit 02ba8e5. Configure here.}