Borrowing it
Nothing to install: this file belongs to BackendGameSetMatch/sourcebook. 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/BackendGameSetMatch/sourcebook/main/.claude/skills/sourcebook-bundle/SKILL.mdgit clone --depth 1 https://github.com/BackendGameSetMatch/sourcebookWrote 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/backendgamesetmatch/sourcebook/sourcebook-bundle)<a href="https://agentmods.dev/skills/backendgamesetmatch/sourcebook/sourcebook-bundle"><img src="https://agentmods.dev/badge/skills/backendgamesetmatch/sourcebook/sourcebook-bundle/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/backendgamesetmatch/sourcebook/sourcebook-bundle"><img src="https://agentmods.dev/badge/skills/backendgamesetmatch/sourcebook/sourcebook-bundle.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 | $0.00085 | $0.00317 |
| Opus 5.5 | $0.00034 | $0.00127 |
| Sonnet 5.5 | $0.00017 | $0.00063 |
| Haiku 4.5 | $0.00009 | $0.00032 |
Grade A, and why
sourcebook-bundle 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.
What it actually says
AI Documentation Bundle Loader
Load a context bundle to get full knowledge about a specific domain.
Usage
Run the bundle assembler with a scope name:
python .claude/skills/sourcebook-bundle/scripts/lookup.py bundle $ARGUMENTS
Available bundles
Bundles are whatever this project defines in /docs/ai/bundles/ — the set
differs per project, so do not assume a name exists. To see the real list,
run the command with any unknown scope; it prints the available bundles:
python .claude/skills/sourcebook-bundle/scripts/lookup.py bundle list-me
A fresh sourcebook init starts you with ci (CI/CD pipelines, build and
deployment), apis (API references and related decisions), onboarding
(system cards + glossary + conventions), and backend (backend services,
jobs, data pipelines). Projects add, rename, and remove these freely.
The output is a single markdown document with all relevant docs assembled and ready for use as context.
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 · 37 lines · 85 tokens per session scan A 6875bbed2396
sourcebook-bundle is a skill published in the GitHub repository BackendGameSetMatch/sourcebook (4 stars, last pushed 2mo ago), licensed MIT. It adds 85 tokens to every session and 317 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 2026-08-31.
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A guide to shortening the information an agent carries between steps. It explains how to replace large tool outputs and old conversation details with compact, useful summaries while preserving important decisions and constraints.
memory-system
A guide to giving an AI agent persistent, user-specific memory across conversations. It covers what to remember, how to store it, how to update or compress it, and when to use memory instead of a shared knowledge base.