fic-create-plan

fic-create-plan is a skill for Claude Code, Codex from saski/arnesto. It costs 37 tokens per session (297 once invoked), scanned A, original, Unlicense.

A collaborative workflow for turning research or a task description into a detailed, staged coding plan saved as a Markdown file.

In plain words
What is it for?
Use it to create implementation plans with phases, concrete file paths, automated success criteria, and any agreed design tradeoffs.
Why use it?
It clarifies the current and desired states, decisions, file changes, and checks before implementation begins.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/saski/arnesto/fic-create-plan
Any agent
npx skills add saski/arnesto --skill fic-create-plan
Clone the repo
git clone --depth 1 https://github.com/saski/arnesto

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 fic-create-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/saski/arnesto/fic-create-plan.svg)](https://agentmods.dev/skills/saski/arnesto/fic-create-plan)
Your own site
<a href="https://agentmods.dev/skills/saski/arnesto/fic-create-plan"><img src="https://agentmods.dev/badge/skills/saski/arnesto/fic-create-plan.svg" alt="Measured on agentmods" height="20"></a>
Per session 37 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 297 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00037 $0.00297
Opus 5 $0.00018 $0.00148
Sonnet 5 $0.00007 $0.00059
Haiku 4.5 $0.00004 $0.00030

Measured 5d ago against content hash 5efdb49fcab8, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fic-create-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 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.

.agents/skills/fic-create-plan/SKILL.md · 41 lines

What it actually says

FIC Create Plan

Act as a senior XP engineer producing an implementation plan through iterative collaboration.

Workflow

  1. Gather context:
    • Read referenced research docs, tickets, and existing code.
    • Identify constraints, patterns, and integration points.
    • Work back and forth with me, starting with your open questions and outline before writing the plan
  2. Confirm understanding with a concise summary and focused questions.
  3. Propose 1-2 viable design options with tradeoffs.
  4. Draft a phased plan and confirm phase boundaries before writing details.
  5. Write the final plan in thoughts/shared/plans/YYYY-MM-DD-topic.md.

Plan Requirements

  • Include: overview, current state, desired end state, out-of-scope, approach, phased changes.
  • Include concrete file paths for expected modifications.
  • Include automated success criteria for each phase.
  • Keep open questions out of the final approved plan.

Success Criteria Guidance

  • Prefer automated verification commands.
  • Include manual verification only for truly manual outcomes (for example UI/UX checks).
  • Avoid criteria that should be covered by automated tests.

Completion

End with:

  • Plan path
  • Phase list
  • Next step (fic-implement-plan <plan-path>)
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. 5d ago First seen · 41 lines · 37 tokens per session scan A 5efdb49fcab8

Subscribe to this mod's changes

fic-create-plan is a skill published in the GitHub repository saski/arnesto (5 stars, last pushed 9d ago), licensed Unlicense. It adds 37 tokens to every session and 297 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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