hop: Skill for Claude Code

.claude/skills/openspec-archive-change/SKILL.md

openspec-archive-change is a skill for Claude Code from amittamari/hop. It costs 31 tokens per session (1,136 once invoked), scanned A, a copy of openspec-archive-change, MIT.

A command workflow for archiving a completed change in OpenSpec, an experimental system for managing implementation specifications. It checks the available change records and their completion before archiving one.

In plain words
What is it for?
Use it after implementing a planned OpenSpec change, when you need to inspect active changes, validate completion, and move the selected change into the archive.
Why use it?
It helps keep finished specification work organized and avoids archiving the wrong change by requiring an explicit selection when the target is unclear. It also accounts for OpenSpec repositories registered as separate stores.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: names the AskUserQuestion tool.

This is amittamari/hop's own configuration. It tells Claude Code how to work on hop itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything hop configures →

Reuse

Borrowing it

Nothing to install: this file belongs to amittamari/hop. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/amittamari/hop/master/.claude/skills/openspec-archive-change/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/amittamari/hop

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,136 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.
Origin 92% copy Near-identical to another mod 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 $0.00031 $0.01136
Opus 5 $0.00015 $0.00568
Sonnet 5 $0.00006 $0.00227
Haiku 4.5 $0.00003 $0.00114

Measured 10d ago against content hash 5d214ad332e8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

openspec-archive-change 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 10d 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.

Origin

This is a copy

92% identical to openspec-archive-change — 6 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/skills/openspec-archive-change/SKILL.md · 118 lines

How it starts

The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Archive a completed change in the experimental workflow.

Store selection: If the user names a store (a store is a standalone OpenSpec repo registered on this machine) or the work lives in one, run openspec store list --json to discover registered store ids, then pass --store <id> on the commands that read or write specs and changes (new change, status, instructions, list, show, validate, archive, doctor, context). Other commands do not take the flag. Hints printed by commands already carry the flag; keep it on follow-ups. Without a store, commands act on the nearest local openspec/ root.

Input: Optionally specify a change name. If omitted, check if it can be inferred from conversation context. If vague or ambiguous you MUST prompt for available changes.

Steps

  1. If no change name provided, prompt for selection

    Run openspec list --json to get available changes. Use the AskUserQuestion tool to let the user select.

    Show only active changes (not already archived). Include the schema used for each change if available.

    IMPORTANT: Do NOT guess or auto-select a change. Always let the user choose.

  2. Check artifact completion status

    Run openspec status --change "<name>" --json to check artifact completion.

    Parse the JSON to understand:

    • schemaName: The workflow being used
    • planningHome, changeRoot, artifactPaths, and actionContext: path and scope context
    • artifacts: List of artifacts with their status (done or other)

    If any artifacts are not done:

    • Display warning listing incomplete artifacts
    • Use AskUserQuestion tool to confirm user wants to proceed
    • Proceed if user confirms
  3. Check task completion status

    Read the tasks file (typically tasks.md) to check for incomplete tasks.

    Count tasks marked with - [ ] (incomplete) vs - [x] (complete).

    If incomplete tasks found:

    • Display warning showing count of incomplete tasks
    • Use AskUserQuestion tool to confirm user wants to proceed
    • Proceed if user confirms

    If no tasks file exists: Proceed without task-related warning.

  4. Assess delta spec sync state

    Use artifactPaths.specs.existingOutputPaths from status JSON to check for delta specs. If none exist, proceed without sync prompt.

    If delta specs exist:

    • Compare each delta spec with its corresponding main spec at openspec/specs/<capability>/spec.md
    • Determine what changes would be applied (adds, modifications, removals, renames)
    • Show a combined summary before prompting

    Prompt options:

    • If changes needed: "Sync now (recommended)", "Archive without syncing"
    • If already synced: "Archive now", "Sync anyway", "Cancel"

    If user chooses sync, use Task tool (subagent_type: "general-purpose", prompt: "Use Skill tool to invoke openspec-sync-specs for change ''. Delta spec analysis: "). Proceed to archive regardless of choice.

  5. Perform the archive

    Create an archive directory under planningHome.changesDir if it doesn't exist:

    mkdir -p "<planningHome.changesDir>/archive"
    

    Generate target name using current date: YYYY-MM-DD-<change-name>

    Check if target already exists:

    • If yes: Fail with error, suggest renaming existing archive or using different date
    • If no: Move changeRoot to the archive directory
    mv "<changeRoot>" "<planningHome.changesDir>/archive/YYYY-MM-DD-<name>"
    
  6. Display summary

    Show archive completion summary including:

    • Change name
    • Schema that was used
    • Archive location
    • Whether specs were synced (if applicable)
    • Note about any warnings (incomplete artifacts/tasks)

Output On Success

## Archive Complete

**Change:** <change-name>
**Schema:** <schema-name>
**Archived to:** the archive path derived from `planningHome.changesDir`/YYYY-MM-DD-<name>/
**Specs:** ✓ Synced to main specs (or "No delta specs" or "Sync skipped")

All artifacts complete. All tasks complete.

Read the full file on GitHub · 118 lines

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. 10d ago First seen · 118 lines · 31 tokens per session scan A 5d214ad332e8

Subscribe to this mod's changes

openspec-archive-change is a skill published in the GitHub repository amittamari/hop (5 stars, last pushed 12d ago), licensed MIT. It adds 31 tokens to every session and 1,136 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 92% identical to openspec-archive-change, differing in 6 lines, and is treated as a copy.

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