ase-task-preflight

ase-task-preflight is a skill for Claude Code, Codex from rse/ase. It costs 50 tokens per session (1,590 once invoked), scanned A, original, Apache-2.0.

A dry-run review of a task plan before implementing it. A dry run checks what would happen without carrying out the change.

In plain words
What is it for?
Use it to preflight a current task or specification and prepare a draft implementation change set.
Why use it?
It can reveal an empty or incomplete plan before implementation begins, but the supplied details do not describe its full output.

Skill for Claude CodeCodex

Part of the ase plugin — 47 skills, 8 agents, 5 hooks shipped together

View the source file rse/ase
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/rse/ase/ase-task-preflight
Any agent
npx skills add rse/ase --skill ase-task-preflight
Clone the repo
git clone --depth 1 https://github.com/rse/ase

Made for: Claude Code, Codex.

Or install ase, the plugin that ships this one along with the rest of its 47 skills, 8 agents, 5 hooks.

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 ase-task-preflight

README.md
[![agentmods](https://agentmods.dev/badge/skills/rse/ase/ase-task-preflight.svg)](https://agentmods.dev/skills/rse/ase/ase-task-preflight)
Your own site
<a href="https://agentmods.dev/skills/rse/ase/ase-task-preflight"><img src="https://agentmods.dev/badge/skills/rse/ase/ase-task-preflight.svg" alt="Measured on agentmods" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,590 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 $0.00050 $0.01590
Opus 5 $0.00025 $0.00795
Sonnet 5 $0.00010 $0.00318
Haiku 4.5 $0.00005 $0.00159

Measured 3d ago against content hash fba404a96a4a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ase-task-preflight 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 3d 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.

plugin/skills/ase-task-preflight/SKILL.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

@${CLAUDE_SKILL_DIR}/../../meta/ase-control.md @${CLAUDE_SKILL_DIR}/../../meta/ase-skill.md @${CLAUDE_SKILL_DIR}/../../meta/ase-dialog.md @${CLAUDE_SKILL_DIR}/../../meta/ase-getopt.md

$ARGUMENTS

@${CLAUDE_SKILL_DIR}/../../meta/ase-format-task.md @${CLAUDE_SKILL_DIR}/../../meta/ase-common-task.md @${CLAUDE_SKILL_DIR}/../../meta/ase-tenets.md @${CLAUDE_SKILL_DIR}/../../meta/ase-common-code.md

Procedure

  1. Determine Task:

    1. Set initially, with any leading and trailing whitespace stripped. Inherit the always existing from the current context. Inherit the always existing from the current context. Do not output anything.

    2. React on task id:

  2. Determine Operation:

    1. Determine the current task plan content:

    2. If the is still empty, complain and tell the user to use the ase-code-resolve, ase-code-refactor, ase-code-craft, or ase-task-edit skills first to create a task plan. Then immediately stop processing this skill.

    3. Internalize the tenets stated by the plan:

  3. Create Implementation Draft:

    1. Perform a preflight of the implementation of by creating a draft for a corresponding, complete artifact change set which would fully implement the task plan . Store this artifact change set in unified diff format in .

      Create this draft with the same rigor as the final implementation of the companion skill ase-task-implement, because that skill later takes the draft over 1:1 -- the user is assumed to review the draft in between. Hence read the current content of every artifact the draft touches before drafting its hunks, so all context lines match the artifacts exactly and the diff would apply cleanly, and honor the task plan and the internalized tenets just as the final implementation would. Only the actual modification of the artifacts and the verification phase are deferred to ase-task-implement.

    2. Append this artifact change set to the end of the with the following . If a section named ## IMPLEMENTATION DRAFT already exists from a previous run of this skill, replace this entire existing section.

      Set to a run of backtick characters one longer than the longest backtick run occurring anywhere inside , but to at least three, so a diff which itself carries fenced code blocks (e.g. one over Markdown artifacts) cannot terminate the block prematurely.

      IMPLEMENTATION DRAFT

      text

    3. Update with the current time in ISO-style format, which has to be determined by calling the ase_timestamp(format: "yyyy-LL-dd HH:mm") tool of the ase MCP server and using the text field of its response. Update the Modified: ... frontmatter key of with the new value, creating the whole key at its position in the key order of the plan if the plan does not carry it yet. Do not output anything.

Read the full file on GitHub · 167 lines

Files

What ships with it

1 file 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. 3d ago First seen · 167 lines · 50 tokens per session scan A fba404a96a4a

Subscribe to this mod's changes

ase-task-preflight is a skill published in the GitHub repository rse/ase (47 stars, last pushed 6d ago), licensed Apache-2.0. It adds 50 tokens to every session and 1,590 once invoked, about $0.0003 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 2026-08-30.

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