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 benwu95/prospec --skill prospec-promote-backfillgit clone --depth 1 https://github.com/benwu95/prospecWrote 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/benwu95/prospec/prospec-promote-backfill)<a href="https://agentmods.dev/skills/benwu95/prospec/prospec-promote-backfill"><img src="https://agentmods.dev/badge/skills/benwu95/prospec/prospec-promote-backfill/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/benwu95/prospec/prospec-promote-backfill"><img src="https://agentmods.dev/badge/skills/benwu95/prospec/prospec-promote-backfill.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 | $0.00130 | $0.02673 |
| Opus 5 | $0.00065 | $0.01337 |
| Sonnet 5 | $0.00026 | $0.00535 |
| Haiku 4.5 | $0.00013 | $0.00267 |
Grade A, and why
prospec-promote-backfill 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 5d 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 — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Prospec Promote Backfill Skill
Activation
When triggered, briefly describe:
- That you'll formalize a reviewed
backfill-draft.mdinto the backfill change scaffold —proposal.md+delta-spec.md+metadata.yaml— so it can graduate throughprospec-verify(backfill mode) →prospec-archive - That this is the single, repeatable draft→scaffold step — it replaces ad-hoc hand conversion and is where the
scale: backfillmarker is set - That
backfillis a light scale likequick: it records existing behavior, so there is noplan.mdand notasks.md(nothing to plan, no work to schedule). The scaffold enters the lifecycle directly atstatus: implemented - That it never writes the trust zone (
prospec/specs/features/) —prospec archive(the CLI) stays the sole writer
Language Policy
Write each generated document in the language the Constitution's Language Policy rule assigns to its path — change artifacts and their archived summaries in the project's artifact language, the trust zone (Knowledge base, Feature Specs, index) in English. One skill run may write both. Keep code, identifiers, technical terms, and git commit messages in English.
CLI Prerequisite (required)
The prospec CLI is a required file for this skill — its deterministic steps call
prospeccommands. Probe BEFORE any other step; there is no manual fallback.
- Run
prospec --version(Bash). - Command not found / not executable → STOP. Ask the user to install the prospec standalone
executable — the one-click installer script from the project README (macOS/Linux
install.sh, Windowsinstall.ps1) or a release binary from GitHub Releases; prospec is NOT published to npm. Then re-run this skill. - Version older than 2.1.0 → STOP. Report the installed vs required version and ask the user to upgrade, then re-run this skill.
Hand-executing a CLI-owned mutation is NEVER the fallback — that re-introduces the nondeterministic serialization this contract exists to remove.
What ships with it
2 files 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.
- 5d ago Changed 9334fc909223
- 9d ago First seen · 141 lines · 130 tokens per session scan A f4744025ddc8
prospec-promote-backfill is a skill published in the GitHub repository benwu95/prospec (5 stars, last pushed yesterday), licensed MIT. It adds 130 tokens to every session and 2,673 once invoked, about $0.0006 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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