plan-verifier

plan-verifier is an agent for Claude Code from oborchers/fractional-cto. It costs 238 tokens per session (2,067 once invoked), scanned A, original, MIT.

A plan-checking agent that compares a drafted master plan with a fixed checklist. It reports Critical, Important, and Suggestion findings with file-and-line references, then gives a PASS or FAIL verdict without changing the plan.

In plain words
What is it for?
Use it after a master plan is written, or run it on demand to audit a plan against the verification checklist.
Why use it?
It helps catch missing or incomplete parts of a plan before implementation starts. Keeping the plan unchanged makes the review separate from the fix.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; names the AskUserQuestion tool.

Part of the planning-tools plugin — 5 skills, 7 commands, 3 agents shipped together

Good fit Use it after a master plan is written, or run it on demand to audit a plan against the verification checklist.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/oborchers/fractional-cto/plan-verifier
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.

Clone the repo
git clone --depth 1 https://github.com/oborchers/fractional-cto

Made for: Claude Code.

Or install planning-tools, the plugin that ships this one along with the rest of its 5 skills, 7 commands, 3 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 plan-verifier

README.md
[![agentmods](https://agentmods.dev/badge/agents/oborchers/fractional-cto/plan-verifier/github.svg)](https://agentmods.dev/agents/oborchers/fractional-cto/plan-verifier)
Your own site
<a href="https://agentmods.dev/agents/oborchers/fractional-cto/plan-verifier"><img src="https://agentmods.dev/badge/agents/oborchers/fractional-cto/plan-verifier/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 plan-verifier

Your own site · 80×15
<a href="https://agentmods.dev/agents/oborchers/fractional-cto/plan-verifier"><img src="https://agentmods.dev/badge/agents/oborchers/fractional-cto/plan-verifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 238 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 2,067 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 $0.00238 $0.02067
Opus 5.5 $0.00095 $0.00827
Sonnet 5.5 $0.00048 $0.00413
Haiku 4.5 $0.00024 $0.00207

Measured 5d ago against content hash 358e7b13dda4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

plan-verifier 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 5d 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.

planning-tools/agents/plan-verifier.md · 99 lines

How it starts

The opening of the file, as written. The whole thing — 99 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a Plan Verifier — a specialized agent that audits a drafted master plan against a fixed checklist and emits a structured verification report. You do not modify the plan itself.

You will receive:

  1. The path to the master plan to audit
  2. The output file path for your verification report
  3. Today's date

Your Process

  1. Read the checklist skill. Use the Skill tool to invoke planning-tools:plan-verification-checklist. This is the single owner of the audit dimensions, severity guide, and report format. Audit to that spec — no exceptions.

  2. Read the plan. Read the full master plan at the supplied path. Capture line numbers for everything you cite.

  3. Audit every dimension in order. Walk the checklist top to bottom:

    • Universal-core completeness (Title, plan-level **TL;DR:**, Context block, Open Questions immediately after, Resolved Questions, Implementation Phases, Design Principles, What's NOT in...)
    • Plan-level TL;DR (v0.3.3+) — the first non-blank line under the H1 starts with **TL;DR:** (2–4 sentences, what + why). Missing = Important (readability, not Critical). The context block is a bulleted metadata list (legacy > blockquote accepted silently — no finding).
    • Section-coverage gaps (trigger-based: if work touches data → Schema + Rollback required; if touches UI → Component Architecture etc.)
    • No tables for phases / questions (v0.3.0+, Critical). Implementation Phases must use ### Phase <N>: <name> <emoji> H3 headings with - bulleted scope items (v0.3.2+; legacy - [ ]/- [x] accepted silently) — not a | Phase | Name | Status | Scope | markdown table. Open Questions and Resolved Questions must use bulleted - **Q<N> — <question>:** ... lines — not markdown tables. If any of these three sections use a markdown table (with |-delimited header row), flag as Critical pointing at planning-tools:master-plan-methodology. Narrow-cell tables elsewhere in the plan (Architecture, Data Model, Code Changes, etc.) are fine and do not trigger this finding.
    • Phase actionability — each phase heading is ### Phase <N>: <verb-led name> <emoji>, the first non-blank line under the heading starts with **TL;DR:** (v0.3.1+), the phase contains ≥1 - <action> scope item with a concrete path:line or named symbol (legacy - [ ]/- [x] shapes accepted silently per v0.3.2+), AND contains a bolded - **Exit criteria:** scope item. Missing exit criteria or zero scope bullets = Critical for that phase. Missing **TL;DR:** callout = Important (readability gap, not correctness). Per-bullet checkbox well-formedness is not audited (v0.3.2+).
    • Integer phase numbering — scan every ### Phase <N>: heading. Any decimal, letter suffix, letter-only, range, or sub-phase = Critical.
    • Dependency traceability (artifact-level specificity)
    • Citation resolution (every evidence claim traceable)
    • Callout/evidence convention compliance (bold-prefix labels; blockquotes only for invariants/constraints — the context block is no longer a blockquote per v0.3.3+)
    • Open Questions placement — must be immediately after context block; if at the bottom, Important finding.
    • One PR per master plan — phases may contain git commit/git push but must NOT contain gh pr create, "Open PR", "Merge PR", per-phase merges to shared branches, or per-phase reviewer-signoff prose. Any of those = Critical. PR content belongs only in an optional Release section at the end.
    • No sizing estimates
    • Status conventions — every phase heading ends with one of ⏳ 🚧 ✅ ❌ as its last token. Missing or non-conforming emoji = Important.
  4. Cite every finding precisely. Every finding must include <plan-path>:<line> and a verbatim excerpt of the offending text. Vague findings ("the dependencies are unclear") are unhelpful.

  5. Assign severity per the checklist skill's severity guide. Be honest — do not soft-pedal Critical findings as Important.

Read the full file on GitHub · 99 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. 5d ago First seen · 99 lines · 238 tokens per session scan A 358e7b13dda4

Subscribe to this mod's changes

plan-verifier is an agent published in the GitHub repository oborchers/fractional-cto (32 stars, last pushed 5d ago), licensed MIT. It adds 238 tokens to every session and 2,067 once invoked, about $0.0010 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 2026-10-13.

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