A tool for adding a follow-up note, correction, or status change to an already published capsule. A capsule is a stored record containing a problem, its status, tags, solution, and later updates.

Use it to append dated updates to a capsule, review its previous updates, and sync the change to both its Gist and the central registry.

It keeps new information attached to the original record instead of leaving the published version outdated. It also checks authentication and shows the capsule's current state before an update is added.

update — Skill by fragcap

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/fragcap/plugin/update

Any agent

npx skills add fragcap/plugin --skill update

Clone the repo

git clone --depth 1 https://github.com/fragcap/plugin

Made for: Claude Code, Codex.

Per session 27 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 489 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.

Model	Per session	Once invoked
Fable 5	$0.00027	$0.00489
Opus 5	$0.00014	$0.00244
Sonnet 5	$0.00005	$0.00098
Haiku 4.5	$0.00003	$0.00049

Measured yesterday against content hash 81fc8d2b9289, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

update 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 yesterday.

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.

skills/update/SKILL.md · 49 lines

What it actually says

Update Capsule

Append a follow-up finding, correction, or status change to an already-pushed capsule (SKILL.md).

Updates are appended as ## Update (YYYY-MM-DD) sections at the end of the SKILL.md file.

Script Convention

FRAGCAP_DATA="${CLAUDE_PLUGIN_DATA}" node "${CLAUDE_PLUGIN_ROOT}/scripts/<n>.mjs" [args]

If a script exits with a non-zero code or returns { error: "..." }, stop immediately and surface the error to the user. Never silently retry with a different command or skip the step.

When to Activate

User runs /fragcap:update or /fragcap:update <gist-id>
User wants to add new information to an existing capsule

Flow

Auth gate — run auth-status.mjs. Not authenticated → direct to /fragcap:auth and stop.
Select capsule:
- If $ARGUMENTS is provided, use it as gist_id.
- Otherwise, run list-gists.mjs and show a numbered list. Present options inline — user replies with a number:
```
[1] <problem summary>  [2] <problem summary>  ...
```
Show current state — run fetch-capsule.mjs <gist-id> and display problem, status, tags, solution, and previous updates.
Collect update:
- Note: ask the user "What's the new finding, correction, or follow-up?" (free text, required)
- Status change: present options inline — user replies with a number:
```
[1] keep current  [2] open  [3] resolved  [4] abandoned
```
Apply — run update.mjs <gist-id> "<note>" [status].
Confirm:
- Success: "Updated! Status: {status} | Total updates: {n} | Registry: synced"
- Error: show the message and remind user they can only update their own capsules.

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.

yesterday First seen · 49 lines · 27 tokens per session scan A 81fc8d2b9289

Subscribe to this mod's changes

update is a skill published in the GitHub repository fragcap/plugin (2 stars, last pushed 5mo ago), licensed MIT. It adds 27 tokens to every session and 489 once invoked, about $0.0001 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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