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/ui-phase)<a href="https://agentmods.dev/skills/sienklogic/plan-build-run/ui-phase"><img src="https://agentmods.dev/badge/skills/sienklogic/plan-build-run/ui-phase/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.
<a href="https://agentmods.dev/skills/sienklogic/plan-build-run/ui-phase"><img src="https://agentmods.dev/badge/skills/sienklogic/plan-build-run/ui-phase.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00015 | $0.01494 |
| Opus 5.5 | $0.00006 | $0.00598 |
| Sonnet 5.5 | $0.00003 | $0.00299 |
| Haiku 4.5 | $0.00002 | $0.00149 |
Grade A, and why
ui-phase 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 181 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 tokens. Begin executing Step 0 immediately.
Step 0 -- Banner
Before ANY tool calls, display this banner:
╔══════════════════════════════════════════════════════════════╗
║ PLAN-BUILD-RUN ► UI PHASE DESIGN ║
╚══════════════════════════════════════════════════════════════╝
Then proceed to Step 1.
Step 1 -- Load State
Read the following files:
pbr-tools state load
Also read .planning/config.json to check for ui.enabled setting.
Step 2 -- Check UI Eligibility
Determine whether the UI pipeline should be active:
2a. If config.ui.enabled is explicitly true, proceed to Step 3.
2b. If config.ui.enabled is explicitly false, display:
UI pipeline is disabled. Enable with: /pbr:config set ui.enabled true
Then STOP. Do not proceed further.
2c. If ui.enabled is not set (undefined), auto-detect frontend project:
- Check
package.jsonfor dependencies or devDependencies containing:react,vue,angular,svelte,next,nuxt,solid-js,preact,lit,@angular/core - Check for
index.htmlin the project root orpublic/orsrc/ - Check for
.css,.scss,.less,.sassfiles insrc/orstyles/
If frontend indicators are found, proceed to Step 3.
If NO frontend indicators are found, ask the user:
This doesn't appear to be a frontend project. No frontend frameworks
or UI files were detected.
Options:
1. Continue anyway (I know this project has UI components)
2. Cancel (this project doesn't need UI design contracts)
3. Enable permanently: /pbr:config set ui.enabled true
If the user chooses option 1, proceed. If option 2, STOP. If option 3, tell them to run the config command and then re-run /pbr:ui-phase.
Step 3 -- Parse Arguments
Parse $ARGUMENTS for:
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.
- 1mo ago First seen · 181 lines · 15 tokens per session scan A 314826994e05
ui-phase is a skill published in the GitHub repository SienkLogic/plan-build-run (19 stars, last pushed 6mo ago), licensed MIT. It adds 15 tokens to every session and 1,494 once invoked, about $0.0001 per session on Opus 5.5. 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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