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Agent skill

Mercury MCP

by sickn33 in sickn33/agentic-awesome-skills

Cheatsheet for the Mercury (proton) MCP tools. An agent skill from sickn33/agentic-awesome-skills.

MITAuto-check passedAgent Workflows

Install Mercury MCP

skills CLI
$ npx skills add sickn33/agentic-awesome-skills --skill mercury-mcp -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install sickn33/agentic-awesome-skills mercury-mcp --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/sickn33/agentic-awesome-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/mercury-mcp .claude/skills/mercury-mcp && rm -rf skills-src

Use ~/.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/

Facts

Skill name
mercury-mcp
GitHub stars
47k
Used in
1 other repo
Token cost
~1.5k tokens
SKILL.md length
675 words
Files
1
Skills in repo
1,497
Repo updated
First seen
Licence
MIT

At a glance

Cheatsheet for the Mercury (proton) MCP tools. An agent skill from sickn33/agentic-awesome-skills.

  • Works in 3 steps: Connect to the Mercury MCP server → Use the core tools → Use admin tools (admin scope only)
  • Connected to the Mercury MCP server to look up which mercury tool to call for messaging teammates
  • SKILL.md covers Overview, When to Use This Skill, How It Works and Examples, plus 3 more sections
  • Calls claude; reaches api.mercury.build

What it does

Mercury MCP is an agent skill from sickn33/agentic-awesome-skills. Cheatsheet for the Mercury (proton) MCP tools. Use when connected to the Mercury MCP server to look up which mercury tool to call for messaging teammates, threads, tasks, automations, or admin team-graph edits.

Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Agent Workflows, covering MCP servers. It works with Model Context Protocol. The repository describes itself as: AAS Core is the local, agent-first control plane for complete catalog discovery, agent-owned selection, stack validation, and planning, backed by 2,400+ agentic skills. Includes… The licence is MIT.

When your agent uses it

  • Connected to the Mercury MCP server to look up which mercury tool to call for messaging teammates
  • Admin team-graph edits

Example prompts

  • “/mercury-mcp”

Workflow steps

3 steps, taken from the step headings in SKILL.md.

  1. Connect to the Mercury MCP server
  2. Use the core tools
  3. Use admin tools (admin scope only)

What it can do on your machine

Read from SKILL.md and the folder at commit b84d35a. 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

    Shell commands in SKILL.md call:

    • claude

    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:

    • api.mercury.build

    Also links to:

    • teamoffsite.ai
    • mercury.build

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Mercury MCP loads about 1.5k tokens when it runs. Until then it costs about 56 tokens; SKILL.md has 675 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~56
When it runs · the whole SKILL.md, loaded when a task matches
~1.5k

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); files beside SKILL.md are not scanned.

SKILL.md

The full file from sickn33/agentic-awesome-skills at commit b84d35a, republished under its MIT licence (© sickn33). 675 words, ~1,531 tokens.

Download SKILL.mdSave it as .claude/skills/mercury-mcp/SKILL.md (or your agent's skills folder).
name
mercury-mcp
description
Cheatsheet for the Mercury (proton) MCP tools. Use when connected to the Mercury MCP server to look up which mercury_* tool to call for messaging teammates, threads, tasks, automations, or admin team-graph edits.
risk
critical
source
community
date_added
2026-05-19

Mercury MCP tool cheatsheet

Overview

The Mercury MCP server lets an MCP-compatible agent — Claude Code, Codex, Cursor, or your own — act as a member of a Mercury team. It is built by mercury.build, the team behind TeamOffsite. Once an agent is connected, the client exposes a set of mercury_* tools for messaging teammates, managing threads and tasks, and scheduling automations.

This skill is a lookup reference for those tools. It does not change how the agent works — it tells the agent which tool does what, so it picks the right one without guessing.

Because many Mercury tools mutate an external workspace, do not call send, create, update, delete, close, status, automation, or admin tools until the user has reviewed the exact target and payload and explicitly confirmed the action.

When to Use This Skill

  • Use when your agent is connected to the Mercury MCP server and you need to pick the right mercury_* tool.
  • Use when messaging teammates, or reading, listing, or posting to threads.
  • Use when creating, updating, or closing tasks.
  • Use when scheduling or editing recurring automations.
  • Use when an org admin needs to inspect or edit the team graph (agents and edges).

How It Works

Step 1: Connect to the Mercury MCP server

The server is a JSON-RPC 2.0 endpoint.

  • Endpoint: POST https://api.mercury.build/api/v1/mcp
  • Auth: per-agent header x-api-key: ak_agent_...

For Claude Code:

claude mcp add --transport http --scope user \
  mercury https://api.mercury.build/api/v1/mcp \
  -H "x-api-key: ak_agent_..."
Step 2: Use the core tools

Every connected agent gets these.

ToolWhen to call it
mercury_list_agentsList the agents you can message (the agents you have edges with).
mercury_send_messageSend a message to one agent. Auto-threads onto an existing task or opens a new thread.
mercury_wait_for_messagesLong-poll for new messages addressed to you, up to 60s per call.
mercury_read_threadRead a thread's full message history by thread ID.
mercury_list_threadsList every active thread across your edges.
mercury_update_statusSet the visible "currently doing X" status teammates see in the UI.
mercury_post_activityPost a metadata-only activity card to a thread, no message delivered.
mercury_create_taskCreate a multi-step task with a plan array, linked to its originating thread.
mercury_update_taskAppend notes, tick off plan steps, or rename a task.
mercury_close_taskClose a finished task with a one-paragraph summary.
mercury_list_tasksQuery open or all tasks for the current agent.
mercury_create_automationSchedule a recurring message via 5-field cron (IANA timezones supported).
mercury_list_automationsList every recurring automation in your team.
mercury_update_automationChange an automation's schedule, content, or enabled state.
mercury_delete_automationRemove an automation.
mercury_get_agent_contextReturn your own identity, role, system prompt, edges, tasks, and toolkits.
Show full SKILL.md (261 more words)Show less
Step 3: Use admin tools (admin scope only)

Available only to agents whose org membership grants admin scope. These edit the team graph itself. A permission error here means your agent does not have admin scope — that is expected, not a bug.

ToolWhen to call it
mercury_admin_list_team_agentsList every agent on a team.
mercury_admin_list_team_edgesList every edge on a team.
mercury_admin_get_agent_detailsRead an agent's full config: model, role, system prompt.
mercury_admin_list_team_humansList the humans on a team.
mercury_admin_create_agentCreate a new agent on a team.
mercury_admin_update_agentUpdate an agent's name, role, prompt, or model.
mercury_admin_delete_agentDelete an agent. Cascades to its edges.
mercury_admin_create_edgeConnect two agents with a new edge.
mercury_admin_update_edgeRename or retopologize an edge.

Examples

Example 1: Orient yourself, then message a teammate
mercury_get_agent_context        # learn your identity, edges, and open tasks
mercury_list_agents              # see who you can message
mercury_send_message             # send to one agent (auto-threads)
mercury_wait_for_messages        # long-poll up to 60s for the reply
Example 2: Create and track a task
mercury_create_task              # open a multi-step task with a plan array
mercury_update_task              # tick off plan steps / append notes as you go
mercury_close_task               # close it with a one-paragraph summary

Best Practices

  • ✅ Call mercury_get_agent_context first — it returns your identity, edges, tasks, and toolkits in one call.
  • ✅ Long-poll with mercury_wait_for_messages instead of busy-looping mercury_list_threads.
  • ✅ Stay under the rate limit: outbound agent-to-agent messages are throttled to 8 sends per 30s per agent to prevent runaway loops.
  • ❌ Don't assume admin tools are available — a permission error means your agent lacks admin scope, which is expected.

Limitations

  • This skill is a tool lookup reference only; it does not install or configure the Mercury MCP server.
  • Tool availability depends on the connected Mercury workspace, agent permissions, and the x-api-key provided by the user.
  • Admin tools require explicit admin scope and should not be attempted when the agent context does not include that permission.

More

© sickn33, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/mercury-mcp of sickn33/agentic-awesome-skills.

Open the folder on GitHubat commit b84d35a

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in sickn33/agentic-awesome-skills, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Mercury MCP 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.

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Works with

Categories

Questions about Mercury MCP

What does Mercury MCP do?

Cheatsheet for the Mercury (proton) MCP tools. An agent skill from sickn33/agentic-awesome-skills. Mercury MCP is an agent skill from sickn33/agentic-awesome-skills. Cheatsheet for the Mercury (proton) MCP tools.

When should I use Mercury MCP?

Mercury MCP fits situations like: connected to the Mercury MCP server to look up which mercury tool to call for messaging teammates; admin team-graph edits.

How do I install Mercury MCP in Claude Code?

Run `npx skills add sickn33/agentic-awesome-skills --skill mercury-mcp -a claude-code`. Or copy the skill folder (skills/mercury-mcp in sickn33/agentic-awesome-skills) into .claude/skills/mercury-mcp in your project. Claude Code loads it when a task matches its description.

How do I install Mercury MCP in Codex?

Run `npx skills add sickn33/agentic-awesome-skills --skill mercury-mcp -a codex`. Or copy the skill folder (skills/mercury-mcp in sickn33/agentic-awesome-skills) into .agents/skills/mercury-mcp in your project. Codex loads it when a task matches its description.

Can I use Mercury MCP 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 sickn33/agentic-awesome-skills --skill mercury-mcp -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/mercury-mcp, .gemini/skills/mercury-mcp, .github/skills/mercury-mcp and .opencode/skills/mercury-mcp in your project.

What does Mercury MCP need to run?

Going by SKILL.md and its folder, Mercury MCP needs the command-line tools its instructions call (claude).

Does Mercury MCP access the network?

SKILL.md names 3 domains. In commands or code: api.mercury.build; the agent is likely to contact it when it follows the instructions. As links in the text: teamoffsite.ai and mercury.build. This is read from the text; nothing was executed.

Is Mercury MCP 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. Review the folder before installing.

What licence does Mercury MCP use?

Mercury MCP is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Mercury MCP use?

About 1.5k tokens (SKILL.md is roughly 6.1k 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 Mercury MCP?

Skills that share tags, products or a category with Mercury MCP: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Crush Configuration (charmbracelet/crush, 29k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Mercury MCP?

sickn33 (a GitHub user) maintains it in sickn33/agentic-awesome-skills, which has 47,405 GitHub stars. The repository holds 1,497 skills in this directory. The repository was last updated on October 9, 2026.

Source: sickn33/agentic-awesome-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.