Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add xberg-io/tree-sitter-language-pack --skill e2e-fixturesgit clone --depth 1 https://github.com/xberg-io/tree-sitter-language-packWrote 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/xberg-io/tree-sitter-language-pack/e2e-fixtures)<a href="https://agentmods.dev/skills/xberg-io/tree-sitter-language-pack/e2e-fixtures"><img src="https://agentmods.dev/badge/skills/xberg-io/tree-sitter-language-pack/e2e-fixtures/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/xberg-io/tree-sitter-language-pack/e2e-fixtures"><img src="https://agentmods.dev/badge/skills/xberg-io/tree-sitter-language-pack/e2e-fixtures.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 | $0.00046 | $0.00374 |
| Opus 5.5 | $0.00018 | $0.00150 |
| Sonnet 5.5 | $0.00009 | $0.00075 |
| Haiku 4.5 | $0.00005 | $0.00037 |
Grade A, and why
e2e-fixtures 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 yesterday.
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.
What it actually says
tree-sitter-language-pack E2E Fixtures
- Files under
fixtures/<category>/hold one fixture or an array;categoryanddocs.topicboth equal the directory. Categories:smoke(one per language),process,data_extraction,language-detection,query,error-handling,download,registry,parsing, plusbench. - Fields:
id,description,category,tags,docs {topic, stem, title},input,assertions, and optionallycallandskip {languages, reason}. calldefaults toprocess, withinput.source_codeandinput.config(language, plus flags such asdata_extraction).alef.tomldefines the other calls. Fixtures use 22 of them, for exampledetect_extension,detect_path,get_language,has_language,download_languages,highlights,list_languagesandclean_cache.- Assertion types in use:
not_error,equals,count_min,count_equals,is_true,is_false,greater_than_or_equal,contains,is_empty,not_empty,error.
What ships with it
1 file 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.
- yesterday First seen · 21 lines · 46 tokens per session scan A a8754672e9f2
e2e-fixtures is a skill published in the GitHub repository xberg-io/tree-sitter-language-pack (479 stars, last pushed today), licensed MIT. It adds 46 tokens to every session and 374 once invoked, about $0.0002 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 2026-10-28.
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Crawlberg Taskfile loops for alef regeneration, core and binding builds, e2e generate/build/test and cleanup, plus known e2e gotchas. Use when unsure which task to run, or when a crawlberg build, alef regen or e2e run misbehaves.
crawl-engine-map
Module map of the crawlberg core crate (engine, HTTP, tower layers, HTML pipeline, feature-gated browser/ai/mcp/api/warc modules, types). Use when finding where crawl logic lives in crates/crawlberg.
dotnet-testing-advanced-aspnet-integration-testing
Guidance for ASP.NET Core integration tests, which test several web application parts together through HTTP requests and responses.
dotnet-testing-advanced-webapi-integration-testing
Guidance for ASP.NET Core Web API integration tests, including HTTP endpoints and ProblemDetails, a standard format for describing API errors.