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Cursor agent mode ignores old .cursorrules files, requires migration to .mdc

By PulseAugur Editorial · [2 sources] ·

The AI-powered code editor Cursor has deprecated its `.cursorrules` file format in favor of a new `.cursor/rules/*.mdc` system for its agent mode. This change means that existing `.cursorrules` files are silently ignored by the agent, leading to inconsistent behavior and a failure to enforce user-defined preferences. Developers must migrate their rules to the new `.mdc` format, organizing them into files like `always.mdc` for global rules and context-specific files with glob patterns to ensure proper enforcement. AI

IMPACT Developers using Cursor's agent mode must update their configuration files to ensure custom rules are applied.

RANK_REASON This is a product update for a specific tool, detailing a change in configuration file format.

Read on dev.to — Claude Code tag →

AI-generated summary · Google Gemini · from 2 sources. How we write summaries →

COVERAGE [2]

  1. dev.to — Claude Code tag TIER_1 English(EN) · Olivia Craft ·

    .cursorrules Is Silently Ignored in Cursor Agent Mode — Migration Guide to .mdc

    <p>You set up <code>.cursorrules</code>. You wrote your stack preferences, your naming conventions, your "never do this" list. You hit run.</p> <p>The agent does whatever it wants. No error. No warning. Just ignored.</p> <h2> Why .cursorrules Breaks in Agent Mode </h2> <p>The <co…

  2. dev.to — Claude Code tag TIER_1 English(EN) · Olivia Craft ·

    Your .cursorrules File Is Being Silently Ignored in Cursor Agent Mode (Here's the Fix)

    <h1> Your .cursorrules File Is Being Silently Ignored in Cursor Agent Mode (Here's the Fix) </h1> <p>You set up <code>.cursorrules</code>. You wrote your stack preferences, your naming conventions, your "never do this" list. You hit run.</p> <p>The agent does whatever it wants.</…

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