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 skills add joshferrara/ghostwriter --skill ghostwritergit clone --depth 1 https://github.com/joshferrara/ghostwriterWrote 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/joshferrara/ghostwriter/ghostwriter)<a href="https://agentmods.dev/skills/joshferrara/ghostwriter/ghostwriter"><img src="https://agentmods.dev/badge/skills/joshferrara/ghostwriter/ghostwriter.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 5.1 | $0.00074 | $0.02688 |
| Opus 5 | $0.00037 | $0.01344 |
| Sonnet 5 | $0.00015 | $0.00538 |
| Haiku 4.5 | $0.00007 | $0.00269 |
Grade B, and why
ghostwriter scanned grade B with 1 finding 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 7d 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.
Strips warnings and disclaimersmediumAnti-refusal
Omitting safety caveats hides risk from the user and is a common jailbreak preamble.
Present the available source methods and let the user choose one or more. Explain tradeoffs briefly (one line each), don't lecture: How it starts
The opening of the file, as written. The whole thing — 178 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ghostwriter
Teach your agent how to write like you.
Ghostwriter turns your sent writing into a practical style guide your agent can use for drafts that sound like you, not like AI. It has two modes:
- Generate mode builds your personal style guide (usually
ghostwriter-guide.md) by analyzing email, texts, Slack, or other writing you've actually sent. - Use mode loads that guide and drafts or edits in your voice, with your personal style as the primary authority.
Once your personal guide is in place, agent-written drafts should feel spooky good.
This skill is agent-agnostic. It works with Claude Code, Codex, OpenCode/OpenClaw-style agents, Hermes, and similar local agents. It does not require any single vendor, tool, or data source — it adapts to whatever access the current environment already has.
Step 0: Route to a mode
Read the user's request and pick a mode. Do this before anything else.
Generate mode — the user wants to create or update the guide itself. Triggers include:
"create / generate / build / make my Ghostwriter guide", "update / refresh / improve my style guide", "analyze how I write", "teach you how I write", "learn my voice".
Use mode — the user wants the agent to produce or edit writing in their voice. Triggers include:
"write / draft / reply / respond as me", "rewrite / edit / polish / humanize this in my voice", "make this sound like me", "draft an email/text/Slack message for me".
If the request is ambiguous (e.g. "help me with my writing"), ask one short clarifying question: are they building/updating the guide, or do they want something written now?
Generate mode
Goal: produce a standalone markdown style guide the user can paste into any agent without the rest of this skill. Walk through five stages. Keep the user in control at each decision point.
Reference files (read the one that matches the chosen source — don't preload all of them):
references/source-detection.md— how to inventory what access already existsreferences/gmail-gogcli.md— Gmail viaopenclaw/gogclireferences/gmail-googleworkspace-cli.md— Gmail viagoogleworkspace/clireferences/local-email-exports.md—.mbox/.eml/ Takeout exportsreferences/imessage-macos.md— local iMessage database on macOSreferences/slack.md— Slack via MCP or APIreferences/generic-corpora.md—.txt/.json/.csv/ mailbox / pasted textreferences/analysis-framework.md— what dimensions to extract and howreferences/humanizer-cleanup.md— the secondary AI-artifact cleanup pass
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.
- 7d ago First seen · 178 lines · 74 tokens per session scan B bfd1a215efac
ghostwriter is a skill published in the GitHub repository joshferrara/ghostwriter (19 stars, last pushed 3mo ago), licensed MIT. It adds 74 tokens to every session and 2,688 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it B with 1 finding (strips warnings and disclaimers). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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