plan

A slash command that runs only the first part of the Hydraia development process: context analysis, design, threat modelling, and a detailed implementation plan. It writes a design specification and plan, then stops before changing feature code.

In plain words
What is it for?
Analysing a Hydraia request, producing design and implementation documents, reviewing the plan, and preparing work for later execution.
Why use it?
It gives a human a written proposal to review before implementation begins, including affected code areas, constraints, rejected approaches, and security concerns.

Command

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 commands/jdanigo/hydraia/plan
Clone the repo
git clone --depth 1 https://github.com/jdanigo/hydraia
Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 294 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 $0.00018 $0.00294
Opus 5 $0.00009 $0.00147
Sonnet 5 $0.00004 $0.00059
Haiku 4.5 $0.00002 $0.00029

Measured 2d ago against content hash a9688935de3c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 2d 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.

commands/plan.md · 13 lines

What it actually says

Invoke the hydraia skill but run ONLY Phases 0-3: context (code graph + PDF conversion if needed), think-before-coding gate, design + threat model, and the detailed implementation plan with its self-review loop (max 2 iterations). Then STOP — do not execute.

Produce BOTH artifacts: the written design spec under docs/hydraia/specs/ (goal, chosen vs rejected approaches, code-graph anchors, global constraints, threat model) and the frozen, file-level-detailed plan under docs/hydraia/plans/ (both relative to the resolved artifacts base — the external dir when chosen at the storage gate). Do NOT arm the spec-drive gate and do NOT write feature code — this is the human review point before implementation.

Request: $ARGUMENTS

When finished, record telemetry for this run: printf 'brief\n' > <base>/.run-complete (where <base> is the artifacts dir resolved at the storage gate — docs/hydraia/ by default, or the external dir if chosen). The Stop hook logs this run's real token/model/sub-agent usage to the local dashboard (delta-scoped per session, so it never double-counts). Do not hand-write the numbers.

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. 2d ago First seen · 13 lines · 18 tokens per session scan A a9688935de3c

Subscribe to this mod's changes

plan is a command published in the GitHub repository jdanigo/hydraia (8 stars, last pushed 13d ago), licensed MIT. It adds 18 tokens to every session and 294 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.