Dev Blog Finds MCP Tool Ignored DEV.to's 4-Tag Limit That Sibling Script Enforced

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A developer discovered that two code paths in the same repository, both used to publish articles to DEV.to, handled the platform's 4-tag limit inconsistently. The standalone script publish_devto.py correctly truncated tags to four, while the MCP server tool create_article passed through however many tags it received without any cap. Testing confirmed the divergence was a real bug, not a cosmetic difference, as the MCP tool would send six tags in a POST payload that the other script would have trimmed to four. The 4-tag rule had never been formally documented in the repo; it was inferred from a pattern of all published articles having exactly four tags. The developer identified this as part of a recurring issue in the project where parallel functions written at different times silently diverge on shared constraints.

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