evlog is a TypeScript-first logging and observability project built around wide events and structured errors across runtimes. It is intended to help developers record application behavior and diagnose failures.
Borrowing it
Nothing to install: this file belongs to HugoRCD/evlog. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/HugoRCD/evlog/main/.agents/skills/create-adapter/SKILL.mdgit clone --depth 1 https://github.com/HugoRCD/evlogWrote 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/hugorcd/evlog/create-adapter)<a href="https://agentmods.dev/skills/hugorcd/evlog/create-adapter"><img src="https://agentmods.dev/badge/skills/hugorcd/evlog/create-adapter/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/hugorcd/evlog/create-adapter"><img src="https://agentmods.dev/badge/skills/hugorcd/evlog/create-adapter.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Agent Snooping · line 34 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
- medium Agent Snooping · line 171 Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
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 | $0.00075 | $0.02849 |
| Opus 5.5 | $0.00030 | $0.01140 |
| Sonnet 5.5 | $0.00015 | $0.00570 |
| Haiku 4.5 | $0.00007 | $0.00285 |
Grade A, and why
create-evlog-adapter 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 2mo 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 — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create evlog Adapter
Add a new built-in adapter to evlog. Every adapter follows the same architecture and is built on the public toolkit primitives in evlog/toolkit, so a community adapter has the same shape as a built-in one.
PR Title
feat({name}): add the {Name} drain adapter
Recent examples: feat(loki): add the Grafana Loki drain adapter, feat(clickhouse): add the ClickHouse drain adapter. Use the adapter name as the conventional-commit scope, and register that scope (see touchpoint 11).
Scope timing caveat: the semantic PR check reads its scope list from the base branch, so a brand-new scope can't validate the very PR that introduces it. Either register the scope in a small preceding PR (the Loki/ClickHouse pattern), or use an unscoped title (feat: add the {Name} drain adapter) on the introducing PR.
Touchpoints Checklist
| # | File | Action |
|---|---|---|
| 1 | packages/evlog/src/adapters/{name}.ts |
Create adapter source (built on defineHttpDrain from ../shared/drain) |
| 2 | packages/evlog/tsdown.config.ts |
Add build entry |
| 3 | packages/evlog/package.json |
Add exports + typesVersions entries |
| 4 | packages/evlog/test/adapters/{name}.test.ts |
Create unit tests (use test/helpers/fetch.ts) |
| 5 | packages/evlog/test/e2e/{name}.e2e.ts |
Create e2e test gated on env vars; extend the docker sandbox if self-hostable |
| 6 | packages/evlog/test/toolkit/__snapshots__/api-surface.test.ts.snap |
Regenerated by running the tests after a build (pnpm run build then pnpm test) |
| 7 | apps/docs/content/4.integrate/adapters/{category}/{NN}.{name}.md |
Create adapter doc page in the right category |
| 8 | apps/docs/content/4.integrate/adapters/01.overview.md |
Add adapter to overview (frontmatter link + card) |
| 9 | skills/review-logging-patterns/SKILL.md |
Add adapter row in the Drain Adapters table + frontmatter description |
| 10 | .changeset/{name}-adapter.md |
Create changeset (minor) describing the adapter |
| 11 | .github/workflows/semantic-pull-request.yml + .github/pull_request_template.md |
Register {name} as a PR scope in both files |
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.
- 2mo ago First seen · 196 lines · 75 tokens per session scan A cc32b998843b
create-evlog-adapter is a skill published in the GitHub repository HugoRCD/evlog (1,903 stars, last pushed 12d ago), licensed MIT. It adds 75 tokens to every session and 2,849 once invoked, about $0.0003 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 2026-08-30.
create-evlog-adapter compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| create-evlog-adapterHugoRCD/evlog | Skill | 1.9k | 12d ago | MIT | A | 75 | Claude Code, Codex |
| frontmcp-observabilityagentfront/frontmcp | Skill | 148 | yesterday | Apache-2.0 | A | 196 | Claude Code, Codex |
| error-handlingMadAppGang/claude-code | Skill | 287 | 7mo ago | MIT | A | 28 | Claude Code |
| logging-observabilitypan94u/forge | Skill | 40 | 5d ago | none | A | 28 | Claude Code |
| otel-fastapi-stylesuperloglabs/skills | Skill | 13 | 5mo ago | Apache-2.0 | A | 35 | Claude Code, Codex |
| otel-flask-stylesuperloglabs/skills | Skill | 13 | 5mo ago | Apache-2.0 | A | 34 | Claude Code, Codex |
| otel-instrument-featuresuperloglabs/skills | Skill | 13 | 5mo ago | Apache-2.0 | A | 92 | Claude Code, Codex |