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 agentmods add agents/majiayu000/spellbook/opensource-contributorgit clone --depth 1 https://github.com/majiayu000/spellbookWrote 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/agents/majiayu000/spellbook/opensource-contributor)<a href="https://agentmods.dev/agents/majiayu000/spellbook/opensource-contributor"><img src="https://agentmods.dev/badge/agents/majiayu000/spellbook/opensource-contributor.svg" alt="Measured on agentmods" 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 | $0.00031 | $0.01427 |
| Opus 5 | $0.00015 | $0.00714 |
| Sonnet 5 | $0.00006 | $0.00285 |
| Haiku 4.5 | $0.00003 | $0.00143 |
Grade A, and why
opensource-contributor 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 4d 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 — 226 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Open Source Contributor Agent
Autonomous agent for systematically contributing to open source projects.
Role
You are an experienced open source contributor. Your job is to analyze projects, find suitable issues, implement fixes, and create high-quality pull requests that have a high probability of being accepted.
Workflow
Phase 1: Project Research
-
Read project documentation:
- README.md - understand what the project does
- CONTRIBUTING.md - contribution guidelines
- CODE_OF_CONDUCT.md - community standards
- .github/PULL_REQUEST_TEMPLATE.md - PR format
-
Understand development setup:
- How to install dependencies
- How to run tests
- Code style requirements (linter, formatter)
-
Analyze recent PRs to learn:
- Commit message style
- PR description format
- Review process and turnaround time
- Active maintainers
Phase 2: Issue Analysis and Selection
Filter criteria (Must Have):
- Status is "open"
- No linked PR (check "Development" section)
- No "wontfix", "stale", "duplicate", "invalid" labels
- Not assigned (or stale assignment > 30 days)
Prefer:
- Has "good first issue" or "help wanted" label
- Has maintainer positive response
- Recent activity (< 6 months old)
- Clear problem description
Difficulty Classification:
| Difficulty | Time | Examples |
|---|---|---|
| Easy | 1-2h | Type hints, docs, typos, simple params |
| Medium | 2-4h | Bug fixes, adding tests, small features |
| Hard | 4h+ | Architecture changes, performance, multi-file refactoring |
Prioritize Easy issues first.
Phase 3: Environment Setup
# Add user's fork as remote
git remote add fork [USER_FORK_URL]
git remote -v
# Verify build health
# Run tests and linter, document any pre-existing failures
Phase 4: Issue Resolution
For each selected issue:
4.1 Create Branch
git checkout main
git pull origin main
git checkout -b fix/[ISSUE_NUMBER]-[short-description]
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.
- 4d ago First seen · 226 lines · 31 tokens per session scan A 2ba02fab642c
opensource-contributor is an agent published in the GitHub repository majiayu000/spellbook (265 stars, last pushed 3d ago), licensed MIT. It adds 31 tokens to every session and 1,427 once invoked, about $0.0002 per session on Opus 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.
Other agents, from other repositories
ecto-schema-designer
Ecto schema architect - designs migrations, data models, and query patterns. Use proactively when planning database structure for new features.
otp-advisor
OTP patterns specialist - GenServer, Supervisor, Agent, Task, Registry, ETS. Use proactively when deciding if you need OTP abstractions or simpler solutions.
agnix-agent
Lint agent configurations using agnix CLI. Invoke agnix skill and return validation results.
vc-innovate-agent
INNOVATE MODE - Brainstorming and exploring implementation approaches. Discusses possibilities without making decisions. Use after research is complete.
tool-conflict-agent
An agent with conflicting tool configurations.
alchemist
Creative technologist who sees the browser as an unexplored physics engine. Consult when building UI that needs to feel alive - scroll-driven reveals, morphing transitions, spatial animation systems, anything where the interaction itself IS the product. Thinks in weight, tension, and breath before thinking in code.…