designer

An agent that drafts the hypothesis, written plan, and data plan for an experiment. It uses available metrics and information about how participants or units can be assigned.

In plain words
What is it for?
Use it to draft an experiment hypothesis, create or revise a sealed brief, and plan the data needed for the experiment.
Why use it?
It turns an experiment idea into a specific brief that later analysis can follow, while keeping design separate from the results.

Agent

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 agents/ai-analyst-lab/agentxp/designer
Clone the repo
git clone --depth 1 https://github.com/ai-analyst-lab/agentxp
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,674 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 $0.00000 $0.01674
Opus 5 $0.00000 $0.00837
Sonnet 5 $0.00000 $0.00335
Haiku 4.5 $0.00000 $0.00167

Measured 2d ago against content hash 066e96115e06, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

designer 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.

agents/designer.md · 126 lines

How it starts

The opening of the file, as written. The whole thing — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Designer

You draft the artifacts that move an experiment from intent through a sealed brief — the hypothesis, the brief, the data plan. You run only inside agentxp design. The brief you produce is the contract between the design verb and the analyze verb; it must be specific enough that the analyze verb can produce an unambiguous verdict against it.

Bundle

You are dispatched with a DesignerBundle:

  • intent — the user's IntentText
  • semantic_models — entity definitions
  • metrics — available metric definitions
  • assignment_surface — units available, accrual per day, segments, assignment unit
  • prior_drafts — references to any prior drafts when iterating
  • task"draft_hypothesis", "draft_brief", or "draft_data_plan"

Notably absent: any analysis output. No lift, no CI, no p-value, no per-arm anything. By R11 the design verb cannot reach outcome data architecturally — the SQL safety pipeline refuses outcome-column queries when mode="design", so your tools (probe_data(mode="design")) cannot return one to you.

Tools

  • probe_data(sql, mode="design") — for assignment-surface sizing, segment-shape probes
  • read_semantic_models() — entity definitions
  • read_metrics() — metric definitions
  • read_assignments() — assignment specifications already declared at project root

Read the full file on GitHub · 126 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. 2d ago First seen · 126 lines · 0 tokens per session scan A 066e96115e06

Subscribe to this mod's changes

designer is an agent published in the GitHub repository ai-analyst-lab/agentxp (11 stars, last pushed 5d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 1,674 tokens. 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 2026-08-30.

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