spectre-plan

spectre-plan is a skill for Claude Code, Codex from joenandez/spectre. It costs 49 tokens per session (1,458 once invoked), scanned A, original, MIT.

A planning workflow for turning an already agreed project scope into a reviewed implementation handoff before coding begins.

In plain words
What is it for?
Use it to organize feature plans, research evidence, reviews, task lists, and explicit approval before implementation.
Why use it?
It helps teams break approved work into suitable planning documents, reviews, and tasks while keeping the work tied to the confirmed scope.

Skill for Claude CodeCodex

Written for Claude Code and Codex: disable-model-invocation in frontmatter, but also agents/openai.yaml present.

Good fit Use it to organize feature plans, research evidence, reviews, task lists, and explicit approval before implementation.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/joenandez/spectre/spectre-plan
Install

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.

Any agent
npx skills add joenandez/spectre --skill spectre-plan
Clone the repo
git clone --depth 1 https://github.com/joenandez/spectre

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for spectre-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/joenandez/spectre/spectre-plan/github.svg)](https://agentmods.dev/skills/joenandez/spectre/spectre-plan)
Your own site
<a href="https://agentmods.dev/skills/joenandez/spectre/spectre-plan"><img src="https://agentmods.dev/badge/skills/joenandez/spectre/spectre-plan/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.

agentmods 80×15 button for spectre-plan

Your own site · 80×15
<a href="https://agentmods.dev/skills/joenandez/spectre/spectre-plan"><img src="https://agentmods.dev/badge/skills/joenandez/spectre/spectre-plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,458 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Excessive Agency · line 34
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00049 $0.01458
Opus 5.5 $0.00020 $0.00583
Sonnet 5.5 $0.00010 $0.00292
Haiku 4.5 $0.00005 $0.00146

Measured 1mo ago against content hash f1cb724d6524, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

spectre-plan 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 1mo 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.

plugins/spectre-codex/skills/spectre-plan/SKILL.md · 59 lines

How it starts

The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.

plan

Purpose

Turn confirmed Scope into the smallest draft and handoff. spectre-plan-route classifies; primary owns plan. Scope remains immutable.

Inputs

  • $ARGUMENTS: confirmed Scope—thread or managed root/descendant. Repository changes without Scope return to spectre-scope; bugs use spectre-fix. Read-only diagnosis/review, release, and approved-artifact execution remain direct.
  • Existing Scope/PRD, ux.md (preferred) or legacy specs/ux.md, task_context.md, and prior plans.

Working Set

  • Reuse a managed FEATURE_ROOT only when explicit/current-thread evidence ties it to this work (physical directory wins; never branch/recency/lifecycle/scans); distinct work ignores ambient roots. Otherwise, including on collision, standalone MUST first load and follow Skill(spectre-feature-root) through DONE; orchestrated calls escalate. Keep writes beneath it and pass it unchanged.
  • Immutable canonical Scope: concepts/scope.md when present, else confirmed thread; never change it without explicit scope-change approval.
  • Read references/estimation-guidance.md when applicable; each estimate excludes waits and never delays or blocks the gate.
  • Reuse current-request knowledge results/loads; otherwise follow Project knowledge routing. Search actual task across mixed knowledge/work previews; assess, then exact-load applicable records. Standalone #tag: exact search --tag, assess previews, then exact-load applicable matches; never guessed loads. Refine only for an unresolved question or new subject. Keep IDs/revisions in task_context.md; previews/unloaded candidates are not evidence.

Outputs + DONE

Every route writes specs/plan.md and task_context.md with Scope/authority-bound ## Minimum Solution Selection; no review/task/index/task-review artifacts.

DONE when task_context.md binds initial/observed routing to draft/authority hashes; Scope is unchanged; plan.completed records draft; handoff gives alignment/Trade-offs; telemetry is complete|degraded, or authority/scope stops it.

Read the full file on GitHub · 59 lines

Files

What ships with it

5 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.

Changes

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.

  1. 1mo ago Changed f1cb724d6524
  2. 1mo ago Changed bfe4a7ce0c62
  3. 1mo ago Changed · +2 lines 427b1a0d1920
  4. 1mo ago Changed · +3 lines 5f9be448200d
  5. 1mo ago Changed · +6 lines 8f490bdbfb35
  6. 2mo ago Changed f7f76b9bde10
  7. 2mo ago Changed · -13 lines · -3 tokens per session d3610f7ad539
  8. 2mo ago Changed 4b2d4833ec64
  9. 2mo ago First seen · 61 lines · 52 tokens per session scan A 9f657c5a9e51

Subscribe to this mod's changes

spectre-plan is a skill published in the GitHub repository joenandez/spectre (164 stars, last pushed 1mo ago), licensed MIT. It adds 49 tokens to every session and 1,458 once invoked, about $0.0002 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 2026-08-30.

Related

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