A coding command that adds a new MCP tool—an operation an AI assistant can call—to an Airflow server program.

Use it when extending the server with a tool that calls an Airflow adapter and returns response data.

It gives the new operation a standard implementation, documentation, and README entry instead of requiring these steps by hand.

How astronomer/astro-airflow-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to astronomer/astro-airflow-mcp. 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/astronomer/astro-airflow-mcp/main/.claude/commands/add-tool.md

Clone the repo

git clone --depth 1 https://github.com/astronomer/astro-airflow-mcp

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.

README.md

[![agentmods](https://agentmods.dev/badge/commands/astronomer/astro-airflow-mcp/add-tool/github.svg)](https://agentmods.dev/commands/astronomer/astro-airflow-mcp/add-tool)

Your own site

<a href="https://agentmods.dev/commands/astronomer/astro-airflow-mcp/add-tool"><img src="https://agentmods.dev/badge/commands/astronomer/astro-airflow-mcp/add-tool/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/commands/astronomer/astro-airflow-mcp/add-tool"><img src="https://agentmods.dev/badge/commands/astronomer/astro-airflow-mcp/add-tool.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 8 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 243 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 100% copy Near-identical to another mod 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	$0.00008	$0.00243
Opus 5	$0.00004	$0.00121
Sonnet 5	$0.00002	$0.00049
Haiku 4.5	$0.00001	$0.00024

Measured 11d ago against content hash b92b02edc9a8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

add-tool 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 11d 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.

Origin

This is a copy

100% identical to add-tool — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/commands/add-tool.md · 46 lines

What it actually says

Add a new MCP tool named $ARGUMENTS to src/astro_airflow_mcp/server.py.

Steps

If the tool needs a new adapter method, run /add-adapter-method first.
Create internal _impl function that calls the adapter:

def _tool_name_impl(param: str) -> str:
    """Internal implementation."""
    try:
        adapter = _get_adapter()
        data = adapter.method_name(param)
        return json.dumps(data, indent=2)
    except Exception as e:
        return str(e)

Create the MCP tool with descriptive docstring:

@mcp.tool()
def tool_name(param: str) -> str:
    """One-line description.

    Use this tool when the user asks about:
    - "Example query 1"
    - "Example query 2"

    Args:
        param: Description

    Returns:
        JSON with response data
    """
    return _tool_name_impl(param=param)

Add the tool to README.md tools table.

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.

11d ago First seen · 46 lines · 8 tokens per session scan A b92b02edc9a8

Subscribe to this mod's changes

add-tool is a command published in the GitHub repository astronomer/astro-airflow-mcp (13 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 8 tokens to every session and 243 once invoked, about $0.0000 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to add-tool, differing in 0 lines, and is treated as a copy.

Building agents agents ai airflow mcp model-context-protocol

add-tool

Add a new MCP tool to server.py.

astronomer/agents · 8 tokens

add-adapter-method

Add a new method to both Airflow adapters.

astronomer/agents · 9 tokens

check-airflow-compat

Verify code works with both Airflow 2.x and 3.x.

astronomer/agents · 14 tokens

defer

Defer a task to the cleanest grid-energy window inside a deadline. Invoke this command automatically whenever the user signals a task is not time-critical — phrases like "do this later", "by tomorrow", "tonight", "overnight", "by EOD", "sometime this week", "when you have a moment", "remind me to", "queue this up"…

Vitalini/ebb-ai · 168 tokens

check

Check status of deferred ebb-ai tasks.

Vitalini/ebb-ai · 7 tokens

grid

Show current and 24-hour carbon intensity for a grid region.

Vitalini/ebb-ai · 12 tokens

astro-airflow-mcp: Command for Claude Code