miller/pkg/terminals/registry/registry.go
John Kerl 41f5188bd0
Add mlr mcp MCP server + agent playbook, with a --no-shell gate (#2098 PR7) (#2133)
* Plan: flesh out PR7 (MCP server + Agent Skill) design

stdio transport (no HTTP port), mlr mcp terminal in the main binary,
SDK-vs-handroll decision, tool list, in-process vs subprocess split,
run-tool safety (--no-shell prerequisite), single-sourced skill, tests.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Add mlr mcp: MCP server + agent playbook; --no-shell gate (#2098 PR7)

New terminal `mlr mcp` runs a Model Context Protocol server over stdio
(spawned by MCP clients; no network port), exposing five tools --
list_capabilities, which, validate_dsl, describe_data, run -- plus an
agent playbook as MCP prompt/resource. Catalog tools are served
in-process from the help registries; the rest subprocess this same
binary with MLR_ERRORS_JSON=1, a timeout, and an output cap.

Prerequisite: a new --no-shell flag / MLR_NO_SHELL env var (one-way
gate) disables the DSL system/exec functions, piped redirects, and
--prepipe/--prepipex; the MCP server sets it on the commands it runs
unless started with --allow-shell.

Adds the github.com/modelcontextprotocol/go-sdk dependency.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Force LF checkout for the embedded SKILL.md (Windows CI fix)

go:embed embeds checkout bytes, so a CRLF checkout on Windows made the
embedded playbook differ per platform and failed
TestPlaybookHasFrontmatter. Pin the file to eol=lf in .gitattributes.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Move no-shell test DSL into per-case mlr files (Windows CI fix)

Inline single-quoted DSL in cmd files is mangled by the Windows shell
(single quotes are not quote characters there); the harness's
put -f ${CASEDIR}/mlr pattern avoids shell quoting entirely.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
2026-07-03 19:41:49 -04:00

47 lines
1.4 KiB
Go

// Package registry is the single source of truth for the names of Miller's
// "terminals" -- the top-level subcommands like `mlr help` and `mlr version`
// -- and for the top-level version flags.
//
// It exists as its own leaf package (importing nothing within Miller) so that
// both pkg/terminals (which builds the dispatch table) and
// pkg/terminals/completion (which offers these as tab-completion candidates)
// can import it without an import cycle. pkg/terminals imports
// pkg/terminals/completion, so completion cannot import pkg/terminals directly.
package registry
// Terminal subcommand names, in display order. pkg/terminals builds its
// dispatch table from these constants.
const (
TerminalList = "terminal-list"
Completion = "completion"
Help = "help"
Mcp = "mcp"
Regtest = "regtest"
Repl = "repl"
Script = "script"
Version = "version"
Which = "which"
)
// Names is the ordered list of all terminal subcommand names.
var Names = []string{
TerminalList,
Completion,
Help,
Mcp,
Regtest,
Repl,
Script,
Version,
Which,
}
// Top-level version flags, handled in pkg/climain before normal command-line
// parsing.
const (
VersionFlag = "--version"
BareVersionFlag = "--bare-version"
)
// VersionFlagNames is the list of top-level version flags.
var VersionFlagNames = []string{VersionFlag, BareVersionFlag}