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-enricher/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-enricher)<a href="https://agentmods.dev/skills/hugorcd/evlog/create-enricher"><img src="https://agentmods.dev/badge/skills/hugorcd/evlog/create-enricher/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-enricher"><img src="https://agentmods.dev/badge/skills/hugorcd/evlog/create-enricher.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 28 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 124 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 | $0.00064 | $0.01696 |
| Opus 5.5 | $0.00026 | $0.00678 |
| Sonnet 5.5 | $0.00013 | $0.00339 |
| Haiku 4.5 | $0.00006 | $0.00170 |
Grade A, and why
create-evlog-enricher 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 — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create evlog Enricher
Add a new built-in enricher to evlog. Every enricher is built on the public toolkit primitive defineEnricher from evlog/toolkit, so a community enricher has the same shape as a built-in one.
PR Title
feat(core): add the {name} enricher
Enrichers live in the core package surface (evlog/enrichers), so use the core scope unless a dedicated scope exists.
Touchpoints Checklist
| # | File | Action |
|---|---|---|
| 1 | packages/evlog/src/enrichers/index.ts |
Add enricher source (one defineEnricher call) |
| 2 | Same file — createDefaultEnrichers() |
Decide whether the enricher belongs in the default composition (see below) |
| 3 | packages/evlog/test/toolkit/enrichers.test.ts |
Add tests (one describe block per enricher) |
| 4 | apps/docs/content/5.use-cases/5.enrichers.md |
Add a section for the enricher + update the import list and, if applicable, the "All built-in enrichers" default composition text |
| 5 | skills/review-logging-patterns/SKILL.md |
Add the enricher to the Built-in: line in the Enrichers section |
| 6 | packages/evlog/README.md |
Add the enricher to the Built-in Enrichers section (root README.md is a symlink to it) |
| 7 | .changeset/{name}-enricher.md |
Create changeset (minor) |
Important: Do NOT consider the task complete until all 7 touchpoints have been addressed.
Should it join createDefaultEnrichers()?
createDefaultEnrichers() composes user agent, geo, request size, and trace context via composeEnrichers (from ../shared/compose). Add the new enricher to the composition only if it is universally applicable and reads nothing but the request (headers/env). Anything requiring service-specific setup or extra cost stays opt-in. Changing the default composition is a behavior change for every existing createDefaultEnrichers() user: call it out explicitly in the changeset.
Naming Conventions
| Placeholder | Example (UserAgent) | Usage |
|---|---|---|
{name} |
userAgent |
camelCase for event field key |
{Name} |
UserAgent |
PascalCase in function/interface names |
{DISPLAY} |
User Agent |
Human-readable display name |
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.
- 2mo ago First seen · 143 lines · 64 tokens per session scan A ba2134b67790
create-evlog-enricher is a skill published in the GitHub repository HugoRCD/evlog (1,903 stars, last pushed 12d ago), licensed MIT. It adds 64 tokens to every session and 1,696 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-enricher compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| create-evlog-enricherHugoRCD/evlog | Skill | 1.9k | 12d ago | MIT | A | 64 | 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 |