build-perf-diagnostics SKILL.md skillA
build-perf-diagnostics from dotnet/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dotnet/skills/build-perf-diagnostics@git:20261020.cbb2bb7Pins git:20261020.cbb2bb7 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/build-perf-diagnostics/SKILL.md- Versions recorded
- 8
- Latest version
- git:20261020.cbb2bb7, committed Oct 20, 2026
- First version recorded
- Mar 17, 2026
- Size
- 10,577 bytes
- Repository stars
- 5,836
- License
- MIT
Diagnose MSBuild bottlenecks from binlog timelines and Target/Task Performance Summaries after build-perf-baseline establishes measurements. USE FOR: unknown build slowness, RAR >5s, analyzers >30% of Csc, one target >50% of build time, node utilization <80%, excessive Copy tasks, finding restore overhead. DO NOT USE FOR: known repeated-restore fixes (use eliminate-redundant-restores), initial baselines (use build-perf-baseline), incremental rebuilds (use incremental-build), parallelism tuning…
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
## Performance Analysis Methodology
1. **Generate a binlog**: `dotnet build /bl:{} -m`
2. Use the **binlog MCP server** (`Microsoft.AITools.BinlogMcp`, exposed under the `binlog` MCP namespace) which is bundled with this plugin
If the server cannot connect, use `troubleshoot-binlog-mcp` when startup repair is
wanted. If repair is blocked, declined, or unnecessary, use the replay flow below.
### Alternate flow when MCP is unavailable: binlog replay to text logs
1. **Generate a binlog**: `dotnet build /bl:{} -m`
2. **Replay to diagnostic log with performance summary**:
```bash
dotnet msbuild build.binlog -noconlog -fl "-flp:v=diag;logfile=full.log;performancesummary"
```
3. **Read the performance summary** (at the end of `full.log`):
```bash
grep "Target Performance Summary\|Task Performance Summary" -A 50 full.log
```
4. **Find expensive targets and tasks**: The PerformanceSummary section lists all targets/tasks sorted by cumulative time
5. **Check for node utilization**: grep for scheduling and node messages
```bash
grep -i "node.*assigned\|building with\|scheduler" full.log | head -30
```
6. **Check analyzers**: grep for analyzer timing
```bash
…Read the whole file at its exact version.
How to install
mdr add dotnet/skills/build-perf-diagnostics@sha256:17c3a150b8b38fddThe line at the top of this page pins the label git:20261020.cbb2bb7, 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.
[](https://markdownregistry.com/a/art_qrv2txdhcun5f63i)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 8 versions of this file, between Mar 17, 2026 and Oct 20, 2026, about one every 31 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261020.cbb2bb7 latest | 2026-10-20 | cbb2bb7 | 10,577 B | A | view · diff |
| git:20261016.6364668 | 2026-10-16 | 6364668 | 10,410 B | A | view · diff |
| git:20260930.ac46442 | 2026-09-30 | ac46442 | 10,425 B | A | view · diff |
| git:20260624.67e2a47 | 2026-06-24 | 67e2a47 | 10,421 B | A | view · diff |
| git:20260522.0724ccf | 2026-05-22 | 0724ccf | 10,629 B | A | view · diff |
| git:20260519.dfc8aa7 | 2026-05-19 | dfc8aa7 | 10,619 B | A | view · diff |
| git:20260421.05aeb65 | 2026-04-21 | 05aeb65 | 10,283 B | A | view · diff |
| git:20260317.14346ff | 2026-03-17 | 14346ff | 10,270 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10577 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
dotnet/skills · 5,836 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_qrv2txdhcun5f63i GET https://markdownregistry.com/api/v1/resolve?ref=dotnet/skills/build-perf-diagnostics GET https://markdownregistry.com/api/v1/blob/17c3a150b8b38fdd3129d5c81a3151f1b2a6e5f2e8fa66e01b8a88d7069c4994
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.