difftest-tracer SKILL.md skillA
difftest-tracer from openxiangshan/xiangshanlab is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add openxiangshan/xiangshanlab/difftest-tracer@git:20260828.1e67491Pins git:20260828.1e67491 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- openxiangshan/xiangshanlab
- Path
tools/xiangshan-debug/difftest-tracer/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260828.1e67491, committed Aug 28, 2026
- Size
- 8,018 bytes
- Repository stars
- 62
- License
- none declared
Analyze XiangShan and RISC-V difftest failures from simulator logs plus program BIN, ELF, and objdump/disassembly artifacts. Use when Codex must locate the first bad architectural instruction, distinguish DUT, reference-model, test, and environment faults, perform backward taint analysis, or trace instruction flow, control flow, and data flow from Decode through Commit using logs, commit traces, source, or waveforms.
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
# Difftest Tracer Locate the earliest proven divergence, then trace its causes backward and its effects forward. Treat the PC printed by difftest as an observation point, not automatically as the root-cause instruction. Operate in one of two explicit modes: - **Static preliminary**: logs plus ELF/BIN/disassembly can identify mismatch sinks, dynamic commit candidates present in the log, static dependencies, and missing evidence. Do not claim a cycle-accurate RTL root cause. - **Dynamic proof**: matching commit/reference traces and/or waveforms plus the exact source revision can establish the earliest divergent event and microarchitectural causal boundary. ## Start the case 1. Pin every supplied artifact by absolute path, size, and SHA-256. Never modify the originals. 2. Record the XiangShan, NEMU/Spike, difftest, workload, and simulator revisions when available. Record ISA string, privilege mode, reset/load address, seed, cycle, hart, and whether the worktree is dirty. …
Read the whole file at its exact version.
How to install
mdr add openxiangshan/xiangshanlab/difftest-tracer@sha256:26efc3a8ece2eff1The line at the top of this page pins the label git:20260828.1e67491, 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_35d5mf6z2blguq3g)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 28, 2026.
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 (8018 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
openxiangshan/xiangshanlab · 62 stars · license none declared · pushed 2026-11-06 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_35d5mf6z2blguq3g GET https://markdownregistry.com/api/v1/resolve?ref=openxiangshan/xiangshanlab/difftest-tracer GET https://markdownregistry.com/api/v1/blob/26efc3a8ece2eff1297d9d2fb4087959a1e7b1e755b5fb0a56e0e8947f761fc8
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.