Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add bdfinst/agentic-dev-team/plugin install dev-teamWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/bdfinst/agentic-dev-team/stryker-xunit-v2-shim)<a href="https://agentmods.dev/skills/bdfinst/agentic-dev-team/stryker-xunit-v2-shim"><img src="https://agentmods.dev/badge/skills/bdfinst/agentic-dev-team/stryker-xunit-v2-shim/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/bdfinst/agentic-dev-team/stryker-xunit-v2-shim"><img src="https://agentmods.dev/badge/skills/bdfinst/agentic-dev-team/stryker-xunit-v2-shim.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00171 | $0.04347 |
| Opus 5.5 | $0.00068 | $0.01739 |
| Sonnet 5.5 | $0.00034 | $0.00869 |
| Haiku 4.5 | $0.00017 | $0.00435 |
Grade A, and why
stryker-xunit-v2-shim scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 26d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 275 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Stryker xunit.v2 Shim
Role: worker. Builds measurement scaffolding and does not modify the tests it measures.
Why this exists
Stryker.NET (through at least 4.15/4.16) cannot observe mutant kills through
xunit.v3. xunit.v3 runs on the Microsoft Testing Platform (MTP), and Stryker's
per-test coverage/kill mapping doesn't work across it (stryker-net issues 3237,
3629, 3094). The run completes and the initial test pass even succeeds, so the
failure is silent — the only symptom is the score: near-zero, with almost
every mutant reported Survived (e.g. 0.13% — 3 killed / 7,685 survived). That
is the observation-failure signature, not a real result.
The fix is a shim: a second test project that recompiles the same test source
files under xunit.v2 (classic VSTest), which Stryker observes correctly. No test
is rewritten — the shim links the existing .cs files, so there is one source
of truth. Stryker is then run from the shim directory in project mode.
references/shim-howto.md has the full reference build
and any edge case not covered here.
Version scope — this whole skill is a < 5.0.0 workaround
Everything below applies to Stryker.NET < 5.0.0. Starting at 5.0.0
(stryker-net#3752),
-t mtp + coverage-analysis: perTest observes mutant kills through xunit.v3
directly — no shim, no v3-only-construct porting, no operator gate. See
csharp-stryker-net.md
for the >= 5.0.0 command and its concurrency: 1 caveat
(stryker-net#3832,
tracked for removal in #2192).
stryker_xunit_shim_guard.py detects the installed version
(hooks/mutation_adapters/stryker_net.py::stryker_net_version()) and
silent-passes on >= 5.0.0 — this skill's Step 1a operator gate is never
reached on a known >= 5.0.0 install. An undetermined version fails closed to
the < 5.0.0 behavior this skill documents.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 26d ago Changed · +16 lines 8090b9ee4ddd
- 1mo ago First seen · 259 lines · 171 tokens per session scan A ff097733f1f8
stryker-xunit-v2-shim is a skill published in the GitHub repository bdfinst/agentic-dev-team (295 stars, last pushed 4d ago), licensed MIT. It adds 171 tokens to every session and 4,347 once invoked, about $0.0007 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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