implementation-plan

implementation-plan is a skill for Claude Code from navapbc/digital-service-orchestra. It costs 132 tokens per session (26,344 once invoked), scanned A, original, Apache-2.0.

A planning workflow that turns a user story or small epic into ordered implementation tasks driven by tests. It specifies the failing tests to write first and identifies affected files and interfaces.

In plain words
What is it for?
It helps prepare test-first task breakdowns for individual stories and tasks, including architecture and dependency checks.
Why use it?
It gives developers a concrete sequence from expected behaviour to code changes, reducing uncertainty before implementation.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: mentions CLAUDE.md; mentions subagents; positional $N argument.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the dso plugin — 37 skills, 4 commands, 53 agents shipped together

Good fit It helps prepare test-first task breakdowns for individual stories and tasks, including architecture and dependency checks.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add navapbc/digital-service-orchestra
Claude Code
/plugin install dso

Made for: Claude Code.

Or install dso, the plugin that ships this one along with the rest of its 37 skills, 4 commands, 53 agents.

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 implementation-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/navapbc/digital-service-orchestra/implementation-plan/github.svg)](https://agentmods.dev/skills/navapbc/digital-service-orchestra/implementation-plan)
Your own site
<a href="https://agentmods.dev/skills/navapbc/digital-service-orchestra/implementation-plan"><img src="https://agentmods.dev/badge/skills/navapbc/digital-service-orchestra/implementation-plan/github.svg" alt="Measured on agentmods" height="20"></a>

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 implementation-plan

Your own site · 80×15
<a href="https://agentmods.dev/skills/navapbc/digital-service-orchestra/implementation-plan"><img src="https://agentmods.dev/badge/skills/navapbc/digital-service-orchestra/implementation-plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 132 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 26,344 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.00132 $0.26344
Opus 5 $0.00066 $0.13172
Sonnet 5 $0.00026 $0.05269
Haiku 4.5 $0.00013 $0.02634

Measured 7d ago against content hash ed0116f9cf4d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

implementation-plan scanned grade A with 1 finding 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 7d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

prompt: "You are a behavioral coverage validator. For each DD below, determine whether the Verify command invokes the code under test (PASS) or only checks file/string existence (FAIL).\n\nA command FAILS if it matches a
plugins/dso/skills/implementation-plan/SKILL.md · 1,618 lines

How it starts

The opening of the file, as written. The whole thing — 1,618 lines — stays where its author put it; the contents beside it link to each section on GitHub.

The skill dispatches its own sub-agents (dso:approach-proposer, dso:approach-decision-maker, dso:task-decomposer, opus gap-analysis on COMPLEX). Running implementation-plan ITSELF as a sub-agent means those dispatches become nested Task calls — which CLAUDE.md rule:no-nested-task forbids, and which the platform surfaces as [Tool result missing due to internal error], silently losing the plan output.

If you detect that this skill is running as a sub-agent, STOP immediately and return verbatim:

ERROR: /dso:implementation-plan must be invoked at the orchestrator level, not as a sub-agent.
REASON: This skill dispatches sub-agents internally; nesting would violate rule:no-nested-task.
CALLER ACTION: Return control to your orchestrator and have IT invoke /dso:implementation-plan
              directly (via the Skill tool, not the Agent/Task tool).

Do NOT proceed with any of the Phase A/B/C steps. Do NOT dispatch any further sub-agents. Do NOT produce a partial plan.

Proxy detection (best-effort): if the Agent tool is unavailable in your context (<available_tools> does not list Agent / Task), you are running as a sub-agent — refuse per above. If the Agent tool IS available, that is a necessary but not sufficient signal that you are at the orchestrator level; if the orchestrator's most recent user-facing turn does not match the trigger phrases for this skill (per the description: frontmatter), and you were invoked via Skill tool by an upstream skill rather than by the user directly, treat the invocation as suspect and prefer to STOP-and-return rather than proceed.

Caller-side enforcement: orchestrators that detect the ERROR return from this skill MUST halt their own progression rather than swallow the ERROR and continue — silently continuing produces a broken plan with missing sub-agent outputs.

Implementation Plan: Atomic Task Generation

Generate a production-safe implementation plan for a User Story by decomposing it into atomic, TDD-driven tasks with correct dependencies. Prioritize understanding over assumptions — resolve ambiguity before planning.

Read the full file on GitHub · 1,618 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. 7d ago First seen · 1,618 lines · 132 tokens per session scan A ed0116f9cf4d

Subscribe to this mod's changes

implementation-plan is a skill published in the GitHub repository navapbc/digital-service-orchestra (6 stars, last pushed yesterday), licensed Apache-2.0. It adds 132 tokens to every session and 26,344 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.