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/authornpx skills add bguthrie/prospero --skill authorgit clone --depth 1 https://github.com/bguthrie/prosperoWrote 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/bguthrie/prospero/author)<a href="https://agentmods.dev/skills/bguthrie/prospero/author"><img src="https://agentmods.dev/badge/skills/bguthrie/prospero/author.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 | $0.00026 | $0.02383 |
| Opus 5 | $0.00013 | $0.01192 |
| Sonnet 5 | $0.00005 | $0.00477 |
| Haiku 4.5 | $0.00003 | $0.00238 |
Grade A, and why
author 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 — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Author
Write the best version of the essay from the validated outline. Voice, audience, research sources, and output format all come from the project's Prospero configuration; this skill is a process, not a style sheet.
When to use
- The user has a validated outline at
<drafts_dir>/<slug>/outline.md(typically after/interrogateand, usually,/critique) and is ready to draft.
Do NOT use for:
- Producing a new outline from a topic → use
/interrogate. - Oppositional review of an outline or draft → use
/critique. - Line-level edits on a draft the author has already revised → use
/revise.
Preconditions
Run these as a silent preflight. Do not narrate them to the user unless a check fails; a passing preflight should be invisible.
1. .prospero/config.toml must exist
If .prospero/config.toml does NOT exist in the current working directory, invoke the prospero:init skill and follow it to completion. When init returns, resume at step 2 below. Do not proceed to drafting with an unconfigured project.
2. .prospero/voice.md and .prospero/audience.md must be filled in
For each of .prospero/voice.md and .prospero/audience.md, compute byte-for-byte equality against the plugin's corresponding template at <plugin-root>/templates/voice.md and <plugin-root>/templates/audience.md. Use the plugin-root resolution procedure defined in the init skill's "Resolving the plugin's templates directory" section. Do not abbreviate its failure handling: zero matches → ask the user; multiple matches → ask the user; match found but voice.md or audience.md missing → halt with the resolved path.
- If either user file is Missing → halt with: "
.prospero/<file>is missing. Run/initto restore it, then fill it in before/author." - If either user file is byte-for-byte equal to its template → halt with: "
.prospero/<file>is the unmodified scaffold. Fill it in before running/author; this is the one thing Prospero cannot write for you." - Otherwise → the file is user content. Proceed.
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 · 111 lines · 26 tokens per session scan A fa71b52cd790
author is a skill published in the GitHub repository bguthrie/prospero (6 stars, last pushed 3mo ago), licensed MIT. It adds 26 tokens to every session and 2,383 once invoked, about $0.0001 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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