Here's a concrete example of what composition looks like in practice.
Say your team has an internal `infractl` CLI for managing your deploy infrastructure. No LLM has ever seen it in training data. You add `--mtp-describe` (one function call with any of the SDKs), then open Claude Code and type:
> !mtpcli
> How do I use infractl?
The first line runs `mtpcli`, which prints instructions teaching the LLM the `--mtp-describe` convention: how to discover tools, how schemas map to CLI invocations, how to compose with pipes. The second line causes the LLM to run `infractl --mtp-describe`, get back the full schema, and understand a tool it has never seen in training data. Now you say:
> Write a crontab entry that posts unhealthy pods to the #ops Slack channel every 5 minutes
And it composes your custom CLI with a third-party MCP server it's never touched before:
Your tool, a Slack MCP server, and `jq`, in a pipeline the LLM wrote because it could discover every piece. That script can run in CI, or on a Raspberry Pi. No tokens burned, no inference round-trips. The composition primitives have been here for 50 years. Bash is all you need!
Comments
Here's a concrete example of what composition looks like in practice.
Say your team has an internal `infractl` CLI for managing your deploy infrastructure. No LLM has ever seen it in training data. You add `--mtp-describe` (one function call with any of the SDKs), then open Claude Code and type:
The first line runs `mtpcli`, which prints instructions teaching the LLM the `--mtp-describe` convention: how to discover tools, how schemas map to CLI invocations, how to compose with pipes. The second line causes the LLM to run `infractl --mtp-describe`, get back the full schema, and understand a tool it has never seen in training data. Now you say: And it composes your custom CLI with a third-party MCP server it's never touched before: Your tool, a Slack MCP server, and `jq`, in a pipeline the LLM wrote because it could discover every piece. That script can run in CI, or on a Raspberry Pi. No tokens burned, no inference round-trips. The composition primitives have been here for 50 years. Bash is all you need!