write-patch

write-patch is a command for coding agents from tboome33/obsidian-mcp-router. It costs 53 tokens per session (168 once invoked), scanned A, original, Apache-2.0.

A command for making one targeted change inside a note, such as adding or replacing content under a heading, block, or metadata property.

In plain words
What is it for?
Use it to append, prepend, or replace content in a specific note section or frontmatter key.
Why use it?
It avoids rewriting an entire long file when only one section needs editing, while requiring the full path to nested headings.

Command

Part of the obsidian-router plugin — 47 skills, 51 commands, 2 agents, 3 hooks, 1 MCP server shipped together

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 commands/tboome33/obsidian-mcp-router/write-patch
Clone the repo
git clone --depth 1 https://github.com/tboome33/obsidian-mcp-router

Or install obsidian-router, the plugin that ships this one along with the rest of its 47 skills, 51 commands, 2 agents, 3 hooks, 1 MCP server.

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 write-patch

README.md
[![agentmods](https://agentmods.dev/badge/commands/tboome33/obsidian-mcp-router/write-patch.svg)](https://agentmods.dev/commands/tboome33/obsidian-mcp-router/write-patch)
Your own site
<a href="https://agentmods.dev/commands/tboome33/obsidian-mcp-router/write-patch"><img src="https://agentmods.dev/badge/commands/tboome33/obsidian-mcp-router/write-patch.svg" alt="Measured on agentmods" height="20"></a>
Per session 53 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 168 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 $0.00053 $0.00168
Opus 5 $0.00026 $0.00084
Sonnet 5 $0.00011 $0.00034
Haiku 4.5 $0.00005 $0.00017

Measured 4d ago against content hash d1b78688b34d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

write-patch 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 4d 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.

commands/write-patch.md · 12 lines

What it actually says

Invoke the write-patch skill.

Required: path, operation (append / prepend / replace), targetType (heading / block / frontmatter), target, content.

Optional: vault, targetDelimiter (default ::), createTargetIfMissing, applyIfContentPreexists, trimTargetWhitespace.

The skill documents the heading-target footgun (must be the FULL heading path joined by ::, not just the immediate heading name).

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. 4d ago First seen · 12 lines · 53 tokens per session scan A d1b78688b34d

Subscribe to this mod's changes

write-patch is a command published in the GitHub repository tboome33/obsidian-mcp-router (1 stars, last pushed today), licensed Apache-2.0. It adds 53 tokens to every session and 168 once invoked, about $0.0003 per session on Opus 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 2026-08-31.