check-bin-obj-clash SKILL.md skillA

check-bin-obj-clash from dotnet/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned
mdr add dotnet/skills/check-bin-obj-clash@git:20260930.ac46442

Pins git:20260930.ac46442 in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 17 of 17 checks passed
Kind
SKILL.md skill
Repository
dotnet/skills
Path
plugins/dotnet-msbuild/skills/check-bin-obj-clash/SKILL.md
Versions recorded
6
Latest version
git:20260930.ac46442, committed Sep 30, 2026
First version recorded
May 22, 2026
Size
21,919 bytes
Repository stars
5,788
License
MIT

Detects MSBuild projects with conflicting OutputPath or IntermediateOutputPath. USE FOR: builds failing with 'Cannot create a file when that file already exists', 'The process cannot access the file because it is being used by another process', intermittent build failures that succeed on retry, or missing/overwritten outputs in multi-project or multi-targeting builds where bin/obj (or project.assets.json) collide. Common causes: shared OutputPath, missing AppendTargetFrameworkToOutputPath…

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Detecting OutputPath and IntermediateOutputPath Clashes

## Overview

This skill helps identify when multiple MSBuild project evaluations share the same `OutputPath` or `IntermediateOutputPath`. This is a common source of build failures including:

- File access conflicts during parallel builds
- Missing or overwritten output files
- Intermittent build failures
- "File in use" errors
- **NuGet restore errors like `Cannot create a file when that file already exists`** - this strongly indicates multiple projects share the same `IntermediateOutputPath` where `project.assets.json` is written

Clashes can occur between:
- **Different projects** sharing the same output directory
- **Multi-targeting builds** (e.g., `TargetFrameworks=net8.0;net9.0`) where the path doesn't include the target framework
- **Multiple solution builds** where the same project is built from different solutions in a single build

**Note:** Project instances with `BuildProjectReferences=false` should be **ignored** when analyzing clashes - these are P2P reference resolution builds that only query metadata (via `GetTargetPath`) and do not actually write to output directories.

## When to Use This Skill
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add dotnet/skills/check-bin-obj-clash@sha256:ac355e973ae8577f

The line at the top of this page pins the label git:20260930.ac46442, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_5gwi2m2j6jvox5qd.svg)](https://markdownregistry.com/a/art_5gwi2m2j6jvox5qd)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 6 versions of this file, between May 22, 2026 and Sep 30, 2026, about one every 26 days.

versioncommittedcommitsizeaudit
git:20260930.ac46442 latest2026-09-30 ac46442 21,919 BA view · diff
git:20260717.1b99afa2026-07-17 1b99afa 21,917 BA view · diff
git:20260716.b83443a2026-07-16 b83443a 26,839 BA view · diff
git:20260624.67e2a472026-06-24 67e2a47 22,204 BA view · diff
git:20260616.8a437b12026-06-16 8a437b1 22,423 BA view · diff
git:20260522.1a6e78c2026-05-22 1a6e78c 19,107 BA view

Audit of the latest version

A  17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (21919 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

dotnet/skills · 5,788 stars · license MIT · pushed 2026-11-01 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_5gwi2m2j6jvox5qd
GET https://markdownregistry.com/api/v1/resolve?ref=dotnet/skills/check-bin-obj-clash
GET https://markdownregistry.com/api/v1/blob/ac355e973ae8577f5067c09aa301a8001ba2de681944f2c6221079ecbb38ff2a

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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Every file in dotnet/skills

Other files named check-bin-obj-clash

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