Markdown Article Formatter
JimLiu/baoyu-skills
Reformats plain text or Markdown articles with frontmatter, a title, a summary, headings, bold, lists and code blocks, and saves a separate formatted copy.
Send PDFs as physical US mail with AgentPostage and check prices, letter status, balance, tracking or return receipts.
Install Postage
$ npx skills add aiskillstore/marketplace --skill postage -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install aiskillstore/marketplace postage --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/ctxrs/postage .claude/skills/postage && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "postage" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/ctxrs/postage into .claude/skills/postage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postage", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/aiskillstore/marketplace/tree/main/skills/ctxrs/postageType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add aiskillstore/marketplace --skill postage -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install aiskillstore/marketplace postage --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/ctxrs/postage .agents/skills/postage && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "postage" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/ctxrs/postage into .agents/skills/postage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postage", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add aiskillstore/marketplace --skill postage -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install aiskillstore/marketplace postage --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/ctxrs/postage .cursor/skills/postage && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "postage" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/ctxrs/postage into .cursor/skills/postage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postage", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/aiskillstore/marketplace.git --path skills/ctxrs/postage--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add aiskillstore/marketplace --skill postage -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install aiskillstore/marketplace postage --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/ctxrs/postage .gemini/skills/postage && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "postage" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/ctxrs/postage into .gemini/skills/postage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postage", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install aiskillstore/marketplace postageInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add aiskillstore/marketplace --skill postage -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/ctxrs/postage .github/skills/postage && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "postage" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/ctxrs/postage into .github/skills/postage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postage", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add aiskillstore/marketplace --skill postage -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install aiskillstore/marketplace postage --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/ctxrs/postage .opencode/skills/postage && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "postage" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/ctxrs/postage into .opencode/skills/postage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "postage", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
postage- GitHub stars
- 430
- Token cost
- ~2.2k tokens
- SKILL.md length
- 1,054 words
- Files
- 4 (incl. scripts)
- Skills in repo
- 1,108
- Repo updated
- First seen
- Licence
- MIT
At a glance
Send PDFs as physical US mail with AgentPostage and check prices, letter status, balance, tracking or return receipts.
- Mailing bank disputes
- SKILL.md covers Connect, Mailing inputs and optional…, Send once and Report and recover
- Runs JavaScript scripts from its folder; calls node; reaches agentpostage.com; needs AGENTPOSTAGE_API_KEY and UNIQUE_LETTER_KEY
- Gym cancellations
What it does
Postage is an agent skill from aiskillstore/marketplace. Send PDFs as physical US mail with AgentPostage and check prices, letter status, balance, tracking or return receipts. Use for mailing bank disputes, gym cancellations, credit bureau requests, notices and completed forms.
Its SKILL.md is about 2.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including scripts (for example `skill-report.json`).
It sits in Documents & Office. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified. The licence is MIT.
When your agent uses it
- Mailing bank disputes
- Gym cancellations
- Credit bureau requests
- Notices and completed forms
Example prompts
- “/postage”
Requirements
- Node.js
- A credential in AGENTPOSTAGE_API_KEY
- A credential in UNIQUE_LETTER_KEY
What it can do on your machine
Read from SKILL.md and the folder at commit ad8daf7. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (JavaScript), which the agent can run.
Shell commands in SKILL.md call:
node
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
agentpostage.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
AGENTPOSTAGE_API_KEYUNIQUE_LETTER_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Postage loads about 2.2k tokens when it runs. Until then it costs about 57 tokens; SKILL.md has 1,054 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
The full file from aiskillstore/marketplace at commit ad8daf7, republished under its MIT licence (© aiskillstore). 1,054 words, ~2,153 tokens.
Download SKILL.mdSave it as
.claude/skills/postage/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.- name
- postage
- description
- Send PDFs as physical US mail with AgentPostage and check prices, letter status, balance, tracking or return receipts. Use for mailing bank disputes, gym cancellations, credit bureau requests, notices and completed forms.
Postage
The postage skill sends physical mail through AgentPostage.
Mail an existing PDF using a US return address and US recipient address. Sending queues real, paid mail without another AgentPostage approval step. Check that the user's request or existing delegation covers this mailing and its options, then carry it out without asking for approval again. Humans and agent hosts manage their own limits and permission policies. Ask only when authority or required inputs are missing or unclear. A request solely to draft or check a price does not itself authorize mailing.
Use the user's actual document and addresses. Do not impersonate someone, invent a signature, supporting fact or legal deadline, or add sensitive documents beyond the authorized mailing.
Connect
Prefer AgentPostage MCP tools when connected. Otherwise use the bundled scripts/agentpostage.mjs with Node.js 22+ or the HTTP API. Resolve script paths relative to this skill's directory, not the current working directory. The CLI has no package dependencies.
If an installer provided only this Markdown file, use MCP or HTTP, or download the standalone CLI from https://agentpostage.com/agentpostage.mjs into your working directory and review it before running it. Substitute that file's actual path for the bundled script paths below.
The CLI sends authenticated requests to https://agentpostage.com. Leave AGENTPOSTAGE_BASE_URL unset during normal use. Do not redirect the key or documents to another origin without the owner's explicit authorization.
The human owner creates a verified account, accepts the policies and creates a key at https://agentpostage.com/connect/. Funding happens at https://agentpostage.com/billing/. The agent needs AGENTPOSTAGE_API_KEY in its tool environment, supplied through the runtime's secret store. Never ask for the key in chat, print it, or obtain owner cookies or card details. If absent, ask the human to configure it.
Keys can spend the account balance, with no per-key allowance. They cannot manage keys or directly charge a card. Sending can trigger automatic recharge if the owner enabled it. When funding is needed, return the billing link and wait for the confirmed balance.
For current prices, endpoint fields, print options and limits, read https://agentpostage.com/llms.txt or https://agentpostage.com/docs/. MCP is at https://agentpostage.com/mcp, using Streamable HTTP and Bearer API-key authentication, not OAuth.
Mailing inputs and optional pricing
Obtain the actual PDF and both addresses from authorized context. Ask for missing inputs before sending. Addresses use name, address_line1, optional address_line2, city, two-letter state, postal_code and country: "US". Fields must be single-line printable ASCII. The PDF itself supports Unicode.
Use first_class unless another service is requested. certified adds tracking. certified_return_receipt adds tracking and an electronic return receipt. first_class_flat selects unfolded mailing. first_class_hse adds a Homeowner Statement Enclosed endorsement. None guarantees legal adequacy or delivery dates.
Defaults are black-and-white, single-sided white paper and no reply envelope. Use only authorized options. Reply envelopes are unstamped. Specialty stocks need suitable PDF layout. Check stock prints supplied artwork without issuing a payment.
When a price check is requested or useful under the user's spending controls, read the actual PDF page count and call price_letter with page_count and the options intended for the send. It does not send, store the PDF or reserve money, and does not introduce an approval step. With the CLI, substitute the absolute skill directory below:
node "<skill-directory>/scripts/agentpostage.mjs" balance
node "<skill-directory>/scripts/agentpostage.mjs" price --pages 3 --service first_classA price lookup does not reserve a future rate. Sending freezes the current price when queued. The API does not enforce a per-key allowance or a request-specific maximum price. Follow the user's and host's actual controls without inventing API guarantees.
Source PDFs must be at most 10 MiB. First-Class/HSE permit 500 document pages, either Certified service 150, and explicit flats 75 single-sided or 150 duplex. The included coversheet does not count as a customer page. Encrypted, corrupt and empty PDFs are rejected. For unsupported_print_annotation, export or print to a new PDF and confirm rejection before submitting corrected bytes. Do not silently omit content.
Show full SKILL.md (429 more words)Show less
Send once
Choose and preserve a unique idempotency key before submitting. Keys are 8–128 ASCII letters, digits, dots, colons, underscores or hyphens. Keep it with the intended mailing inputs.
MCP send_letter takes idempotency_key, pdf_base64 of actual PDF bytes, sender, recipient and optional service, color, duplex, paper, return_envelope. Never invent base64 or put an external PDF URL in its place. For a local PDF, the CLI reads and encodes the file directly.
Save the user's addresses as sender.json and recipient.json, then send within the existing delegation:
node "<skill-directory>/scripts/agentpostage.mjs" send \
--pdf letter.pdf \
--sender sender.json \
--recipient recipient.json \
--service first_class \
--idempotency-key UNIQUE_LETTER_KEYReplace the example key with the preserved key. If you checked a price, use those same print options. Optional flags include --color color, --duplex true, --paper and --return-envelope. Run --help for choices.
Without Node.js, POST https://agentpostage.com/v1/letters accepts multipart pdf, sender and recipient, or JSON pdf_base64 and address objects. Supply Bearer authentication and Idempotency-Key. Multipart duplex is a string, JSON duplex a boolean.
Report and recover
Save the returned letter ID. Report the actual status and cost.total_cents. 202 and queued mean saved for sending, not mailed. A legacy null cost does not mean free.
- After a timeout or
5xx, read a known letter ID or list letters first. If retrying, reuse the SAME key, PDF bytes, addresses, service and print options. A fresh key can duplicate mail. A409may indicate changed input or a conflicting state. Inspect it rather than generating a new key. - For
submission_unknown, inspect the existing letter and do not submit a replacement. - For
awaiting_funds, return the owner's billing link. A browser payment return is not proof of funding. acceptedis not proof of mailing or delivery. First-Class ends at confirmedmailed. Certified can reachdelivered. Describe only available evidence.cancel_letterwith{id}can cancel before authorization starts. Only a successful response confirms cancellation. Do not claim that a cancellation attempt stopped mail.- Retrieve an available
receipt_urlwith Bearer authentication if you have an authenticated HTTP download tool. Otherwise give the owner its path underhttps://agentpostage.comto open in a signed-in browser. ChatGPT's configured Actions report receipt availability but do not download PDFs. A receipt can arrive after delivery. Never infer it from the chosen service alone.
MCP follow-up tools are get_letter with {id}, list_letters and list_transactions with optional limit/cursor, and get_balance and get_billing_link with {}. The CLI equivalents are get ID, list, transactions, balance, billing and cancel ID. List limits are 1–50 and next_cursor: null ends pagination.
Keep needed PDFs and receipts before retention ends, 30 days after confirmed First-Class mailing, Certified delivery, cancellation or rejection. Pending mail is retained until resolved. Protect saved documents and addresses as private user data.
© aiskillstore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 3 other files (scripts) in skills/ctxrs/postage of aiskillstore/marketplace.
- SKILL.md
- LICENSE
- scripts/agentpostage.mjs
- skill-report.json
Open the folder on GitHubat commit ad8daf7
Compare with similar skills
Postage next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Postage this skillaiskillstore/marketplace | 430 | — | ~2.2k | Automated safety check: Pass | MIT | |
| Markdown Article FormatterJimLiu/baoyu-skills | 26k | 7 repos | ~3.5k | Automated safety check: Pass | MIT | |
| MarkitdownImCa0/just-laws | 781 | 14 repos | ~3.2k | Automated safety check: Notes | MIT | |
| Obsidian MarkdownAtmosphere/atmosphere | 3.8k | 20 repos | ~1.3k | Automated safety check: Pass | Apache-2.0 | |
| DOCXrvdbreemen/OTGW-firmware | 207 | 33 repos | ~4.3k | Automated safety check: Pass | Proprietary | |
| Gzh Designisjiamu/gzh-design-skill | 3.9k | 1 repos | ~2.2k | Automated safety check: Pass | AGPL-3.0 |
Similar skills
Markitdown
ImCa0/just-laws
Convert files and office documents to Markdown. An agent skill from ImCa0/just-laws.
Obsidian Markdown
Atmosphere/atmosphere
Create and edit Obsidian Flavored Markdown with wikilinks, embeds, callouts, properties, and other Obsidian-specific syntax.
DOCX
rvdbreemen/OTGW-firmware
A skill your agent uses whenever the user wants to create, read, edit, or manipulate Word documents (.docx files).
Gzh Design
isjiamu/gzh-design-skill
微信公众号文章排版引擎，将 Markdown 转换为可直接粘贴到公众号编辑器的 HTML。主题风格从 references/theme-index.md 注册的自定义主题库中选取，自动章节编号、关键词下划线标记、引言卡片、目录导航、代码块、图片/GIF、作者签名。支持 Markdown / Word(.docx) / PDF / 纯文本输入（非 Markdown…
Word Document Reader and Writer
HKUDS/DeepTutor
Reads, creates and edits Word .docx files with python-docx, and drops to raw OOXML for tracked changes, comments and byte-exact edits.
More from aiskillstore/marketplace
All 1,108 skills in this repoCode Stats
aiskillstore/marketplace
Analyze codebase with tokei (fast line counts by language) and difft (semantic AST-aware diffs).
File Search
aiskillstore/marketplace
Modern file and content search using fd, ripgrep (rg), and fzf.
Data Processing
aiskillstore/marketplace
Process JSON with jq and YAML/TOML with yq. An agent skill from aiskillstore/marketplace.
Doc Scanner
aiskillstore/marketplace
Scans for project documentation files (AGENTS.md, CLAUDE.md, GEMINI.md, COPILOT.md, CURSOR.md, WARP.md, and 15+ other formats) and synthesizes guidance.
Find Replace
aiskillstore/marketplace
Modern find-and-replace using sd (simpler than sed) and batch replacement patterns.
Investigating Codebases
aiskillstore/marketplace
Automatically activated when user asks how something works, wants to understand unfamiliar code, needs to explore a new codebase, or asks questions like "where is X implemented?", "how does Y…
Related
Categories
Questions about Postage
What does Postage do?
Send PDFs as physical US mail with AgentPostage and check prices, letter status, balance, tracking or return receipts. Postage is an agent skill from aiskillstore/marketplace. Send PDFs as physical US mail with AgentPostage and check prices, letter status, balance, tracking or return receipts.
When should I use Postage?
Postage fits situations like: mailing bank disputes; gym cancellations; credit bureau requests; notices and completed forms.
How do I install Postage in Claude Code?
Run `npx skills add aiskillstore/marketplace --skill postage -a claude-code`. Or copy the skill folder (skills/ctxrs/postage in aiskillstore/marketplace) into .claude/skills/postage in your project. Claude Code loads it when a task matches its description.
How do I install Postage in Codex?
Run `npx skills add aiskillstore/marketplace --skill postage -a codex`. Or copy the skill folder (skills/ctxrs/postage in aiskillstore/marketplace) into .agents/skills/postage in your project. Codex loads it when a task matches its description.
Can I use Postage in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add aiskillstore/marketplace --skill postage -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/postage, .gemini/skills/postage, .github/skills/postage and .opencode/skills/postage in your project.
What does Postage need to run?
Going by SKILL.md and its folder, Postage needs JavaScript for the scripts in its folder, the command-line tools its instructions call (node) and credentials named AGENTPOSTAGE_API_KEY and UNIQUE_LETTER_KEY. Our summary lists: Node.js; A credential in AGENTPOSTAGE_API_KEY; A credential in UNIQUE_LETTER_KEY.
Does Postage access the network?
SKILL.md names 1 domain. In commands or code: agentpostage.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.
Is Postage safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Postage use?
Postage is published under the MIT licence (from the LICENSE file in the skill folder). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Postage use?
About 2.2k tokens (SKILL.md is roughly 8.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Postage?
Skills that share tags, products or a category with Postage: Markdown Article Formatter (JimLiu/baoyu-skills, 26k stars), Markitdown (ImCa0/just-laws, 781 stars), Obsidian Markdown (Atmosphere/atmosphere, 3.8k stars) and DOCX (rvdbreemen/OTGW-firmware, 207 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Postage?
aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 430 GitHub stars. The repository holds 1,108 skills in this directory. The repository was last updated on October 7, 2026.
Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.