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.
/plugin marketplace add SienkLogic/plan-build-run/plugin install pbrWrote 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.
[](https://agentmods.dev/skills/sienklogic/plan-build-run/milestone)<a href="https://agentmods.dev/skills/sienklogic/plan-build-run/milestone"><img src="https://agentmods.dev/badge/skills/sienklogic/plan-build-run/milestone.svg" alt="Measured on agentmods" height="20"></a>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 5.1 | $0.00014 | $0.09250 |
| Opus 5 | $0.00007 | $0.04625 |
| Sonnet 5 | $0.00003 | $0.01850 |
| Haiku 4.5 | $0.00001 | $0.00925 |
Grade A, and why
milestone 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 3d 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.
Reads agent configuration directorieslowAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
find ~/.claude/insights/ -name "*.html" -mtime -7 2>/dev/null | head -1 Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
How it starts
The opening of the file, as written. The whole thing — 921 lines — stays where its author put it; the contents beside it link to each section on GitHub.
STOP — DO NOT READ THIS FILE. You are already reading it. This prompt was injected into your context by Claude Code's plugin system. Using the Read tool on this SKILL.md file wastes ~7,600 tokens. Begin executing Step 1 immediately.
Step 0 — Immediate Output
Before ANY tool calls, display this banner:
╔══════════════════════════════════════════════════════════════╗
║ PLAN-BUILD-RUN ► MILESTONE ║
╚══════════════════════════════════════════════════════════════╝
Then proceed to Step 1.
/pbr:milestone — Milestone Management
You are running the milestone skill. Milestones represent significant project checkpoints — a set of phases that together deliver a cohesive chunk of functionality. This skill handles the full milestone lifecycle: creation, completion, auditing, and gap analysis.
This skill runs inline for most subcommands, but spawns agents for audit.
References
references/questioning.md— Questioning patterns for milestone review decisionsreferences/ui-brand.md— Status symbols, banners, milestone celebration format
Context Budget
Reference: skills/shared/context-budget.md for the universal orchestrator rules.
Reference: skills/shared/agent-type-resolution.md for agent type fallback when spawning Task() subagents.
Additionally for this skill:
- Never perform integration checks yourself — delegate to the integration-checker subagent
- Minimize reading audit and verification outputs — read only frontmatter and status fields
- Delegate all cross-phase integration analysis to the integration-checker subagent
Multi-Session Sync
Before any phase-modifying operations (archiving phases, updating ROADMAP.md/STATE.md/PROJECT.md), acquire a claim:
acquireClaim(planningDir, sessionId)
If the claim fails (another session owns this project), display: "Another session owns this project. Use /pbr:progress to see active claims."
What ships with it
7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 3d ago First seen · 921 lines · 14 tokens per session scan A 21f71685bdda
milestone is a skill published in the GitHub repository SienkLogic/plan-build-run (17 stars, last pushed 5mo ago), licensed MIT. It adds 14 tokens to every session and 9,250 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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