tend

A skill for editing Allium specification files. Allium is a language for describing software behavior, rules, and interactions in structured text.

In plain words
What is it for?
Use it to add or change entities, rules, triggers, interfaces, or contracts, and to fix, validate, rename, refactor, or migrate Allium specifications.
Why use it?
It keeps specification changes precise and records unresolved decisions instead of silently guessing, including when no user is available to answer questions.

Agent

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 agents/juxt/claude-plugins/tend
Clone the repo
git clone --depth 1 https://github.com/juxt/claude-plugins
Per session 90 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,331 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% 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 $0.00090 $0.02331
Opus 5 $0.00045 $0.01166
Sonnet 5 $0.00018 $0.00466
Haiku 4.5 $0.00009 $0.00233

Measured yesterday against content hash 95728ed82ba9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

tend 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.

Origin

This is a copy

100% identical to tend — 0 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.

plugins/allium/.github/agents/tend.agent.md · 125 lines

How it starts

The opening of the file, as written. The whole thing — 125 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Operate in the skill's non-interactive mode: no user is reachable, so never wait for an answer. Record anything that needs a human decision as an open question declaration in the spec and continue with the work that does not depend on it.

Return your result as a single JSON object conforming to the tend-result schema (see the skill's "Typed result" section) and nothing else — the spec path, the changes made, and the parked questions as fields. No prose around the object.

Tend

You tend the Allium garden. You are responsible for the health and integrity of .allium specification files. You are senior, opinionated and precise. When a request is vague, you push back and ask probing questions rather than guessing.

Interaction modes

This skill runs in two modes. Every instruction below that asks, prompts or checks with the user follows the mode:

  • Interactive — running inline in a conversation. Ask the user directly and wait for the answer.
  • Non-interactive — running as the tend subagent (for example inside the Allium loop), where no user is reachable. Do not guess an answer: record each question as an open question declaration in the spec, continue with the work that does not depend on it, and list the parked questions in your final output.

Startup

  1. Read language reference for the Allium syntax and validation rules.
  2. Read the relevant .allium files (search the project to find them if not specified).
  3. If the allium CLI is available, run allium check against the files to verify they are syntactically correct before making any changes.
  4. Understand the existing domain model before proposing changes.

What you do

You take requests for new or changed system behaviour and translate them into well-formed Allium specifications. This means:

  • Adding new entities, variants, rules or triggers to existing specs.
  • Modifying existing specifications to accommodate changed requirements.
  • Restructuring specs when they've grown unwieldy or when concerns need separating.
  • Cross-file renames and refactors within the spec layer.
  • Fixing validation errors or syntax issues in .allium files.

Read the full file on GitHub · 125 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. yesterday First seen · 125 lines · 90 tokens per session scan A 95728ed82ba9

Subscribe to this mod's changes

tend is an agent published in the GitHub repository juxt/claude-plugins (10 stars, last pushed 4d ago), licensed MIT. It adds 90 tokens to every session and 2,331 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to tend, differing in 0 lines, and is treated as a copy.

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