speckit.companion.plan

speckit.companion.plan is a command for Claude Code from alfredoperez/speckit-companion. It costs 11 tokens per session (6,322 once invoked), scanned A, original, MIT.

A command that creates an implementation plan for a feature, including research and design documents, within a spec-driven development workflow.

In plain words
What is it for?
Use it to plan how a specified feature should be designed and built, while running the project's configured hooks.
Why use it?
It organizes the technical decisions and supporting research before coding begins, reducing uncertainty during implementation.

Command for Claude Code

Written for Claude Code: $ARGUMENTS substitution. Also seen: mentions subagents; mentions Claude Code.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is python3 .specify/extensions/companion/scripts/write-context.py --feature-dir <feature_directory> --step <step> --status <status> --kind start --by extension.

Good fit Use it to plan how a specified feature should be designed and built, while running the project's configured hooks.

Compare 6 commands from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/alfredoperez/speckit-companion
agentmods
npx agentmods add commands/alfredoperez/speckit-companion/speckit.companion.plan

Made for: Claude Code.

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 speckit.companion.plan

README.md
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Your own site
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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for speckit.companion.plan

Your own site · 80×15
<a href="https://agentmods.dev/commands/alfredoperez/speckit-companion/speckit.companion.plan"><img src="https://agentmods.dev/badge/commands/alfredoperez/speckit-companion/speckit.companion.plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 11 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 6,322 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 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 5.1 $0.00011 $0.06322
Opus 5 $0.00005 $0.03161
Sonnet 5 $0.00002 $0.01264
Haiku 4.5 $0.00001 $0.00632

Measured yesterday against content hash dacf361091df, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

speckit.companion.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 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.

speckit-extension/commands/speckit.companion.plan.md · 248 lines

How it starts

The opening of the file, as written. The whole thing — 248 lines — stays where its author put it; the contents beside it link to each section on GitHub.

User Input

$ARGUMENTS

Record this step's start: before anything else runs

A step's recorded window has to contain the work it claims. Stamping the start partway down the body leaves the extension hooks, and any node above the stamp, outside the window the step later reports. So this is the first instruction in the command, ahead of the hooks.

Let <step> be this command's phase and <status> its in-progress status: specify/specifying, plan/planning, tasks/tasking, implement/implementing.

Which feature directory this step stamps against decides when it stamps.

  • A step that mints its own feature directory, meaning any fresh-spec entry point such as specify or auto, has nothing to stamp against yet. .specify/feature.json is this step's output: it still points at the previous spec, so stamping now would write this run's status onto finished work. Resolve the directory first, then stamp the instant it exists, before any other work in the step.
  • Every other step reads the feature directory it was given, from the invocation or from .specify/feature.json, which by then points at this spec. Stamp immediately, before the extension hooks and before any node.

In both cases the call is the same:

python3 .specify/extensions/companion/scripts/write-context.py --feature-dir <feature_directory> --step <step> --status <status> --kind start --by extension

Add --at "<dispatch time>" when the dispatcher printed one; otherwise the script stamps now. Two things keep this honest:

  • Run it, never hand-write it. The script stamps the real clock and writes atomically. A hand-authored entry in .spec-context.json is what corrupts the file.
  • A second start is refused, not reconciled. History is append-only, so if the extension already seeded this step's start, this call appends nothing and the earlier timestamp stands. Running it is always safe; skipping it loses the window.

Read the full file on GitHub · 248 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 Changed dacf361091df
  2. 2d ago Changed · +1 lines bc8f2aa4bde3
  3. 3d ago Changed · -19 lines b285b63ff939
  4. 5d ago Changed · +12 lines 592e8d7a4077
  5. 6d ago Changed · +38 lines aaa0a78862d2
  6. 7d ago Changed · +20 lines 0ef525f030fb
  7. 9d ago First seen · 196 lines · 11 tokens per session scan A 9fa87f491a65

Subscribe to this mod's changes

speckit.companion.plan is a command published in the GitHub repository alfredoperez/speckit-companion (90 stars, last pushed yesterday), licensed MIT. It adds 11 tokens to every session and 6,322 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 2026-09-03.

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