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 skills/bguthrie/prospero/initnpx skills add bguthrie/prospero --skill initgit clone --depth 1 https://github.com/bguthrie/prosperoWhat 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 | $0.00049 | $0.02226 |
| Opus 5 | $0.00024 | $0.01113 |
| Sonnet 5 | $0.00010 | $0.00445 |
| Haiku 4.5 | $0.00005 | $0.00223 |
Grade A, and why
init 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 2d 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 — 146 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Init
Set up Prospero in the current project. Idempotent: safe to re-run for reconfiguration. Never overwrites user-modified content in .prospero/voice.md or .prospero/audience.md. A file whose contents are byte-identical to the plugin's template is treated as an unfilled scaffold and is safe to recopy.
When to use
- Auto-invoked by
/interrogate(and any other phase skill) when.prospero/config.tomlis absent. - Invoked directly via
/initwhen the user wants to change the preset or recopy a missing template file.
Do not invoke any other phase skill from here. Scaffold, confirm, report. Then return control.
Process
You MUST complete each step in order. Do not write any files before the user has confirmed at step 4.
1. Scan for CMS markers
Look in the current working directory (the project root) for the files below. Read each candidate file — do not decide by filename alone.
hugo.toml,hugo.yaml,hugo.json→ Hugo. Also check for a top-levelconfig.toml/config.yamlthat contains Hugo-specific keys (baseURL,theme,[params],[markup])._config.ymlwith Jekyll markers (collections:,permalink:,plugins:referencingjekyll-*, or a_posts/directory nearby) → Jekyll.package.jsonwhosedependenciesordevDependenciesincludeghost,@tryghost/*, or a Ghost-specific build tool → Ghost.- None of the above, or ambiguous markers → plain.
Also note whether the implied content directory exists (content/post/ for Hugo, _posts/ for Jekyll, etc.). A matching config plus a matching content directory is strong evidence. A config alone with no content directory is still enough to propose the preset, but mention the missing directory in the proposal so the user can correct course.
If two CMS markers appear to be present (e.g., a Hugo hugo.toml and a Jekyll _config.yml), do not guess. Ask the user which is canonical.
2. Inspect existing .prospero/ files
Before proposing anything, classify the state of each target path so the proposal at step 3 can be accurate. For each of .prospero/config.toml, .prospero/voice.md, .prospero/audience.md, classify as one of:
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.
- 2d ago First seen · 146 lines · 49 tokens per session scan A 594ac38641c0
init is a skill published in the GitHub repository bguthrie/prospero (6 stars, last pushed 3mo ago), licensed MIT. It adds 49 tokens to every session and 2,226 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 2026-08-31.
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