cartographer: Agent for Claude Code

.claude/agents/cartographer-plan-writer.md

cartographer-plan-writer is an agent for Claude Code from BeppeTemp/cartographer. It costs 73 tokens per session (522 once invoked), scanned A, original, Apache-2.0.

An agent that drafts one plan issue for a software repository after design decisions have been made. It checks those decisions against the current main branch and project documentation, then writes the issue body to a file without changing the repository.

In plain words
What is it for?
Use it to inspect an issue and related open plans, find accurate file-and-line references, and prepare a repository plan issue for review.
Why use it?
It reduces errors such as describing removed settings, duplicating existing checks, or linking to incorrect code locations. It also keeps planning separate from code changes.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter; reads .claude/ paths; mentions AGENTS.md.

This is BeppeTemp/cartographer's own configuration. It tells Claude Code how to work on cartographer itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything cartographer configures →

Reuse

Borrowing it

Nothing to install: this file belongs to BeppeTemp/cartographer. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/BeppeTemp/cartographer/main/.claude/agents/cartographer-plan-writer.md
Clone the repo
git clone --depth 1 https://github.com/BeppeTemp/cartographer

Made for: Claude Code.

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.

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README.md
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Your own site
<a href="https://agentmods.dev/agents/beppetemp/cartographer/cartographer-plan-writer"><img src="https://agentmods.dev/badge/agents/beppetemp/cartographer/cartographer-plan-writer/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.

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Your own site · 80×15
<a href="https://agentmods.dev/agents/beppetemp/cartographer/cartographer-plan-writer"><img src="https://agentmods.dev/badge/agents/beppetemp/cartographer/cartographer-plan-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 73 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 522 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 $0.00073 $0.00522
Opus 5.5 $0.00029 $0.00209
Sonnet 5.5 $0.00015 $0.00104
Haiku 4.5 $0.00007 $0.00052

Measured 7d ago against content hash 5eb240298f0c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cartographer-plan-writer 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 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.

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.

.claude/agents/cartographer-plan-writer.md · 19 lines

What it actually says

You draft exactly ONE plan issue body of this repository, read-only, then stop. The coordinator gives you: the issue number (or, for a split, the sibling it comes from), the design decisions already taken with the maintainer, the sibling plans and their execution order, and the absolute path of a scratch file outside the repository to write the body to.

Your procedure is .claude/skills/cartographer-propose-plan/SKILL.md §Writing a plan, with CONTRIBUTING.md §Plan issues and .github/ISSUE_TEMPLATE/plan.md: read them before starting and follow them to the letter. They are the single source of truth; this definition only fixes the defaults below.

  • Read the issue with gh issue view <n> --json title,body,comments, then the open plans that touch the same files (gh issue list --label plan --state open).
  • Check every decision against main and docs/decisions/ before writing it down. A decision that the code or a later decision contradicts (a removed key, a mode that no longer exists, a check that is already there) is not written as given: write the plan the code allows, and report the contradiction.
  • Pointers are real file:line on the current main, found with Grep/Glob and checked by reading the range; never copy one from the issue without checking it.
  • The only file you write is the scratch file the coordinator named, with Bash. Never edit the repository, never create, edit, label or comment on an issue: publishing and approval belong to the coordinator.
  • The repository is public: placeholder names only (AGENTS.md, D259).

Final report, at most 10 lines, nothing else: the scratch file path; a proposed Plan: … title; one line per work package; every decision you did not write as given, with the evidence (file:line or D<n>); the decision file the Closing names, or none.

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 · 19 lines · 73 tokens per session scan A 5eb240298f0c

Subscribe to this mod's changes

cartographer-plan-writer is an agent published in the GitHub repository BeppeTemp/cartographer (50 stars, last pushed today), licensed Apache-2.0. It adds 73 tokens to every session and 522 once invoked, about $0.0003 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 2026-10-23.

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