$ swamp help init | jq -r '.root.options[] | select(.flags|test("tool")) | .description'
... Built-in: claude, cursor, opencode, codex, copilot, kiro, none.

So swamp init --tool amp, swamp repo upgrade --tool amp, and swamp doctor audit --tool amp all reject Amp, and the "no AI tool configured" error text tells an Amp user to pick a harness they aren't running.

Amp users end up with one of three unsatisfying setups: a per-repo swamp agent setup custom tool that has to be re-declared in every repo's .swamp-custom-tools.yaml and duplicates a definition swamp would otherwise maintain; or enrolling --tool claude/--tool opencode and living with a harness label that doesn't match what is actually running (misreported in .swamp.yaml tools:, audit recording, and the AiTool harness detection added in #292); or nothing at all.

Proposed solution

Add amp to the built-in tool table. Amp's conventions are documented in the Amp owner's manual:

Field	Value
`instructionsFile`	`AGENTS.md` (repo root; Amp also falls back to `AGENT.md`, then `CLAUDE.md`)
`instructionsMode`	`shared` — already the default for root-level `AGENTS.md`
`skillsDir` (project)	`.agents/skills/` (Amp also reads `.claude/skills/`)
`skillsDir` (global)	`~/.config/amp/skills/`, `~/.config/agents/skills/`, `~/.agents/skills/` (Amp also reads `~/.claude/skills/`)
`skillReferenceStyle`	`path` — Amp resolves a skill as a directory containing `SKILL.md` with YAML frontmatter, same shape swamp already ships
settings	user: `~/.config/amp/settings.json[c]`; workspace: nearest `.amp/settings.json[c]`; MCP servers under `amp.mcpServers`
audit hook	TypeScript plugins in `.amp/plugins/.ts` (or `~/.config/amp/plugins/.ts`)
non-interactive CLI	`amp -x "<prompt>"` (`--execute`) — for `nextSteps` text and any scripted invocation

This should be close to a table entry rather than new machinery, because the built-in that Amp needs already exists under other names. swamp repo init --tool opencode --tool codex produces exactly Amp's expected layout — a shared managed section in root AGENTS.md whose rules already point at .agents/skills/swamp/SKILL.md:

$ swamp repo init amp-probe --tool opencode --tool codex --json
{ "instructionsFileCreated": true, "tools": ["opencode", "codex"], ... }
$ find amp-probe -maxdepth 3 -not -path '*/.swamp/*'
amp-probe/AGENTS.md
amp-probe/.opencode/plugins/swamp-audit.ts
...

An amp entry reusing that instructions file and skills dir, plus an amp value in the AiTool/harness-detection enum so telemetry and swamp doctor audit identify the harness correctly, covers the request.

Alternatives considered

swamp agent setup custom tool — works, and is what an Amp user has to do today, but it is repo-scoped (.swamp-custom-tools.yaml), so every new repo repeats it; it never becomes a recognized AiTool for telemetry/audit; and it pins a copy of conventions that upstream would otherwise keep current as Amp changes.
Enroll --tool claude and symlink AGENTS.md -> CLAUDE.md — Amp does read CLAUDE.md as a fallback, so this half-works, and it is what we're doing now. It breaks down as soon as the repo has both harnesses: two managed sections compete for one file, and the enrolled-tool label is wrong.
Enroll --tool opencode (or codex) as an Amp stand-in — closest fit on-disk, per the probe above, and precisely why the marginal cost of a real amp entry looks small. Still mislabels the harness everywhere swamp reports it, and would ship an OpenCode plugin (@opencode-ai/plugin) that Amp cannot load.

Open questions for whoever implements

Does Amp's .amp/plugins/*.ts API expose pre/post tool-execution hooks equivalent to OpenCode's tool.execute.before / tool.execute.after? That determines whether swamp doctor audit --tool amp can record a bash timeline the way the OpenCode plugin does, or whether Amp starts audit-less like other harnesses without a hook surface.
Which global skills dir should swamp update sync into for an amp-enrolled repo? Amp searches several; ~/.config/amp/skills/ is the Amp-owned one and the least likely to collide, given #1051/#943 already tightened global sync so it doesn't create directories for unconfigured tools.

Environment

swamp 20260727.193526.0-sha.03dabbb5
amp CLI installed at ~/.local/bin/amp; ~/.config/amp/settings.json present
Linux (Coder workspace), Node/Deno toolchain per swamp defaults

02Bog Flow

Closed

7/29/2026, 10:23:13 PM

No activity in this phase yet.

03Sludge Pulse

stack72 commented 7/29/2026, 10:23:11 PM

Hey @jasonbarnett - thanks for the request here - we are not going to add every coding agent out there, we need to ensure that we can make sure they are well maintained and this isn't something we use or test on locally. We currently don't support Pi.dev or Kilo either and we suggest that until an agent comes into our orbit that you set it up as a custom agent setup. Sorry for the pain here!

jasonbarnett commented 7/29/2026, 10:49:41 PM

No problemo. Totally reasonable.

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