Agent skill

Logging

by EpicenterHQ in EpicenterHQ/epicenter

wellcrafted/logger for library diagnostics: 5 levels, typed errors, injected sinks, and host-owned durability.

Custom licenceAuto-check passed

Install Logging

skills CLI
$ npx skills add EpicenterHQ/epicenter --skill logging -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install EpicenterHQ/epicenter logging --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/logging .claude/skills/logging && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
logging
GitHub stars
4.8k
Token cost
~2.9k tokens
SKILL.md length
1,121 words
Files
1
Skills in repo
65
Repo updated
First seen
Licence
Custom licence

At a glance

wellcrafted/logger for library diagnostics: 5 levels, typed errors, injected sinks, and host-owned durability.

  • Attach primitives
  • SKILL.md covers Where it lives, Quickstart, The 5 levels and Level is a call-site decision,…, plus 8 more sections
  • Calls bun
  • Background errors

What it does

Logging is an agent skill from EpicenterHQ/epicenter. wellcrafted/logger for library diagnostics: 5 levels, typed errors, injected sinks, and host-owned durability. Use for attach primitives, background errors, durable host logs, or replacing console. in library code.

Its SKILL.md is about 2.9k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: Open-source, local-first apps.

When your agent uses it

  • Attach primitives
  • Background errors
  • Durable host logs
  • Replacing console

Example prompts

  • “/logging”

What it can do on your machine

Read from SKILL.md and the folder at commit 9cc65c3. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • bun

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Logging loads about 2.9k tokens when it runs. Until then it costs about 56 tokens; SKILL.md has 1,121 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~56
When it runs · the whole SKILL.md, loaded when a task matches
~2.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,121 words (~2,906 tokens).

“Structured, level-keyed, field-oriented logging for library code. Modeled on Rust's tracing. Completes the defineErrors story: errors are structured data; level lives at the call site.”

— opening of SKILL.md by EpicenterHQ, Custom licence
name
logging
metadata.author
epicenter
metadata.version
2.2

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/logging of EpicenterHQ/epicenter.

Open the folder on GitHubat commit 9cc65c3

Compare with similar skills

Logging next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Logging compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Logging this skillEpicenterHQ/epicenter4.8k—~2.9kAutomated safety check: PassCustom licence
Rust Path Typesopeninterpreter/openinterpreter69k2 repos~605Automated safety check: PassApache-2.0
Python Type Safetywshobson/agents40k—~1.4kAutomated safety check: PassMIT
Pyrefly Type Coveragepytorch/pytorch104k—~3kAutomated safety check: PassCustom licence
Logging and Error Reporting for Warpwarpdotdev/warp65k1 repos~5.6kAutomated safety check: PassAGPL-3.0
Growth Logaffaan-m/ECC275k1 repos~1.7kAutomated safety check: PassMIT

Similar skills

  • Rust Path Types

    openinterpreter/openinterpreter

    Rules for choosing Rust types for filesystem paths in new Codex code, covering protocol types, internal use and model tool arguments.

    69k GitHub starsUsed in 2 repos~605 tokens
    DevelopmentAuto-check passed
  • Python Type Safety

    wshobson/agents

    Python type safety with type hints, generics, protocols, and strict type checking.

    40k GitHub stars~1.4k tokensUpdated 3 days ago
    DevelopmentAuto-check passed
  • Pyrefly Type Coverage

    pytorch/pytorch

    Migrate a file to use stricter Pyrefly type checking with annotations required for all functions, classes, and attributes.

    104k GitHub stars~3k tokensUpdated today
    DevelopmentAuto-check passed
  • Guides log level choices and when to raise a structured Sentry event instead of a plain log line in the Warp Rust codebase, keeping secrets out of logs.

    65k GitHub starsUsed in 1 repo~5.6k tokens
    DevelopmentAuto-check passed
  • Growth Log

    affaan-m/ECC

    Write growth log entries that extract reusable patterns from completed work — root cause, transferable rule, and a recognizable signal — instead of diary-style event narration, with a 4-8 sentence…

    275k GitHub starsUsed in 1 repo~1.7k tokens
    DevelopmentAuto-check passed
  • Clickhouse Logs Queries

    supabase/supabase

    Official

    Write, review, and migrate Supabase logs queries against the ClickHouse-backed logs table (the logs.all.otel analytics endpoint).

    111k GitHub stars~2.4k tokensUpdated today
    DatabasesAuto-check passed

More from EpicenterHQ/epicenter

All 65 skills in this repo
  • Agent Instructions

    EpicenterHQ/epicenter

    Write and maintain repository guidance across AGENTS.md, CLAUDE.md, and .agents/skills.

    4.8k GitHub stars~1.2k tokensUpdated today
    Auto-check passed
  • Consult Claude

    EpicenterHQ/epicenter

    Assign Claude Code a read-only investigation, recommendation, or finished text draft.

    4.8k GitHub stars~2k tokensUpdated today
    Auto-check passed
  • Better Auth security hardening: rate limits, secrets, CSRF, trusted origins, cookies, sessions, OAuth tokens, and audit logging.

    4.8k GitHub stars~896 tokensUpdated today
    Auto-check passed
  • Cohesion Over Testability

    EpicenterHQ/epicenter

    Collapse test-shaped production boundaries while preserving behavior and coverage.

    4.8k GitHub stars~2k tokensUpdated today
    Auto-check passed
  • Collapse Pass

    EpicenterHQ/epicenter

    Remove indirection that does not earn its boundary across a diff or package.

    4.8k GitHub stars~2k tokensUpdated today
    Auto-check passed
  • Error Handling

    EpicenterHQ/epicenter

    Apply Wellcrafted Result patterns to fallible operations and preserve failures at boundaries.

    4.8k GitHub stars~1.4k tokensUpdated today
    Auto-check passed

Questions about Logging

What does Logging do?

wellcrafted/logger for library diagnostics: 5 levels, typed errors, injected sinks, and host-owned durability. Logging is an agent skill from EpicenterHQ/epicenter. wellcrafted/logger for library diagnostics: 5 levels, typed errors, injected sinks, and host-owned durability.

When should I use Logging?

Logging fits situations like: attach primitives; background errors; durable host logs; replacing console.

How do I install Logging in Claude Code?

Run `npx skills add EpicenterHQ/epicenter --skill logging -a claude-code`. Or copy the skill folder (.agents/skills/logging in EpicenterHQ/epicenter) into .claude/skills/logging in your project. Claude Code loads it when a task matches its description.

How do I install Logging in Codex?

Run `npx skills add EpicenterHQ/epicenter --skill logging -a codex`. Or copy the skill folder (.agents/skills/logging in EpicenterHQ/epicenter) into .agents/skills/logging in your project. Codex loads it when a task matches its description.

Can I use Logging in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add EpicenterHQ/epicenter --skill logging -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/logging, .gemini/skills/logging, .github/skills/logging and .opencode/skills/logging in your project.

What does Logging need to run?

Going by SKILL.md and its folder, Logging needs the command-line tools its instructions call (bun).

Does Logging access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Logging safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Logging use?

Logging has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Logging use?

About 2.9k tokens (SKILL.md is roughly 12k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Logging?

Skills that share tags, products or a category with Logging: Rust Path Types (openinterpreter/openinterpreter, 69k stars), Python Type Safety (wshobson/agents, 40k stars), Pyrefly Type Coverage (pytorch/pytorch, 104k stars) and Logging and Error Reporting for Warp (warpdotdev/warp, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Logging?

EpicenterHQ (a GitHub organization) maintains it in EpicenterHQ/epicenter, which has 4,819 GitHub stars. The repository holds 65 skills in this directory. The repository was last updated on October 8, 2026.

Source: EpicenterHQ/epicenter on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.