What is x-bookmarks-manager?

A tool for reading and searching saved posts on X, formerly known as Twitter, through a command-line program. It checks which account is active before returning the bookmarks as JSON, a structured text format.

Use it to list, search, summarize, or export X bookmarks.

It avoids manually opening and sorting saved posts, while reducing the risk of reading bookmarks from the wrong account.

x-bookmarks-manager — Skill for Claude Code and Codex by eugenepyvovar

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.

Any agent

npx skills add eugenepyvovarov/mcpbundler-agent-skills-marketplace --skill x-bookmarks-agent-skill

Clone the repo

git clone --depth 1 https://github.com/eugenepyvovarov/mcpbundler-agent-skills-marketplace

Made for: Claude Code, Codex.

Its marketplace also offers this one on its own, as the plugin x-bookmarks-agent-skill — /plugin install x-bookmarks-agent-skill after adding the marketplace above.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/eugenepyvovarov/mcpbundler-agent-skills-marketplace/x-bookmarks-agent-skill/github.svg)](https://agentmods.dev/skills/eugenepyvovarov/mcpbundler-agent-skills-marketplace/x-bookmarks-agent-skill)

Your own site

<a href="https://agentmods.dev/skills/eugenepyvovarov/mcpbundler-agent-skills-marketplace/x-bookmarks-agent-skill"><img src="https://agentmods.dev/badge/skills/eugenepyvovarov/mcpbundler-agent-skills-marketplace/x-bookmarks-agent-skill/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/eugenepyvovarov/mcpbundler-agent-skills-marketplace/x-bookmarks-agent-skill"><img src="https://agentmods.dev/badge/skills/eugenepyvovarov/mcpbundler-agent-skills-marketplace/x-bookmarks-agent-skill.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 657 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.

Model	Per session	Once invoked
Fable 5.1	$0.00061	$0.00657
Opus 5	$0.00030	$0.00329
Sonnet 5	$0.00012	$0.00131
Haiku 4.5	$0.00006	$0.00066

Measured 9d ago against content hash ae952ec2466f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

x-bookmarks-manager 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 9d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/setup.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

x-bookmarks-agent-skill/SKILL.md · 47 lines

How it starts

The opening of the file, as written. The whole thing — 47 lines — stays where its author put it; the contents beside it link to each section on GitHub.

X Bookmarks Manager

Overview

Fetch X bookmarks via a local bird CLI install and return JSON for the agent to summarize or filter.

Workflow (agent-driven)

Ensure bird is installed locally via scripts/setup.sh (installs with npm into .skills-data).
Ensure BIRD_EXPECTED_USER is set in .skills-data/x-bookmarks-manager/.env.
Run scripts/x-bookmarks to validate the account and output JSON.
Parse or summarize the JSON for the user.

Commands

scripts/x-bookmarks: validate bird whoami and print bird bookmarks --json.
scripts/setup.sh: install bird in .skills-data/x-bookmarks-manager/venv/node_modules/.bin/bird and create .env.

Output

Raw JSON from bird bookmarks --json on stdout.

Account safety

Always run bird whoami before fetching bookmarks.
If the active account does not match BIRD_EXPECTED_USER, stop and ask the user to fix login or update .env.

Local data and env

Store all mutable state under <project_root>/.skills-data//.
Keep config and registries in .skills-data// (for example: config.json, .json).
Use .skills-data//.env for SKILL_ROOT, SKILL_DATA_DIR, and any per-skill env keys.
Install local tools into .skills-data//bin and prepend it to PATH when needed.
Install dependencies under .skills-data//venv:
- Python: .skills-data//venv/python
- Node: .skills-data//venv/node_modules
- Go: .skills-data//venv/go (modcache, gocache)
- PHP: .skills-data//venv/php (cache, vendor)
Write logs/cache/tmp under .skills-data//logs, .skills-data//cache, .skills-data//tmp.
Keep automation in /scripts and read SKILL_DATA_DIR (default to <project_root>/.skills-data//).
Do not write outside and <project_root>/.skills-data// unless the user requests it.

Notes

bird is installed under .skills-data/x-bookmarks-manager/venv/node_modules/.bin/bird and invoked directly.
Network access is required to download bird from npm on first setup.
If bird is installed manually (npm/pnpm/bun), set BIRD_BIN in .env to the correct path.
If bird is not authenticated, ask the user to log in with bird and retry.

Read the full file on GitHub · 47 lines

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

9d ago First seen · 47 lines · 61 tokens per session scan A ae952ec2466f

Subscribe to this mod's changes

x-bookmarks-manager is a skill published in the GitHub repository eugenepyvovarov/mcpbundler-agent-skills-marketplace (12 stars, last pushed 6mo ago), licensed MIT. It adds 61 tokens to every session and 657 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 2026-09-03.

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