MCPInstall

change-tracking

by dotnetBackend & APIs

Implementation details for EF Core change tracking. Use when changing InternalEntityEntry, ChangeDetector, SnapshotFactoryFactory, or related entity state, snapshot, or property accessor code.

Installs
48
Last 24h
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Trending rank
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Security
Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/dotnet/efcore --skill change-tracking
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads change-tracking automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Change Tracking

Manages entity states and detects changes for SaveChanges().

Core Components

  • StateManager — owns tracked entries, identity/reference maps, fixup, cascades, notifications, and changed counts
  • InternalEntryBase and derived classes — own per-entry state, flags, values, snapshots, and ordered state transitions
  • ChangeDetector — compares current values with baselines and reports changes through entry mutation APIs
  • SnapshotFactoryFactory subclasses — create passive original- and relationship-value baselines
  • IdentityMap — permits one active entry per key; shared identity pairs a replacement with the prior Deleted entry
  • PropertyAccessorsFactory, ClrPropertyGetterFactory and ClrPropertySetterFactory compile property accessors for efficient snapshotting and change detection
    • Ordinals in indices parameter specify element at each complex collection depth

Change Detection

  • Snapshot and notification strategies both call SetPropertyModified() to keep property flags and entity state consistent.
  • SetEntityState() validates values, updates flags and complex entries, changes state, then runs manager bookkeeping hooks.

Shared-Identity Replacement

SharedIdentityEntry is the invariant that distinguishes an old deleted entry from its replacement with the same identity. When attaching a replacement graph, a deleted nested entry should be reconsidered only when its source entry has a replacement; do not broadly process every deleted node. Likewise, cascading from the old replaced principal must not delete dependents that belong to the replacement graph. Keep synchronous and asynchronous graph-attach paths equivalent and preserve unrelated values in replacement tests so they isolate the identity transition.

Testing

Unit tests: test/EFCore.Tests/ChangeTracking/. Functional tests: test/EFCore.Specification.Tests/GraphUpdates/.

Common Pitfalls

PitfallSolution
State-based checks treat every Added/Deleted entry as a replacementScope replacement behavior through SharedIdentityEntry and the graph source

Validation

  • DetectChanges() identifies modified properties via snapshot comparison
  • Setting original values marks properties as modified or unchanged based on comparison with current values

FAQ

What does the change-tracking skill do?

Implementation details for EF Core change tracking. Use when changing InternalEntityEntry, ChangeDetector, SnapshotFactoryFactory, or related entity state, snapshot, or property accessor code.

How do I install change-tracking?

Run npx skills add https://github.com/dotnet/efcore --skill change-tracking in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/change-tracking/ (personal) or .claude/skills/change-tracking/ (project).

Which AI agents can use change-tracking?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is change-tracking safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains change-tracking?

It is published by dotnet in dotnet/efcore. It has 48 recorded installs.

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