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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU Affero General Public License is a free, copyleft license for
software and other kinds of works, specifically designed to ensure
cooperation with the community in the case of network server software.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
our General Public Licenses are intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
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When we speak of free software, we are referring to freedom, not
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software used on network servers, this result may fail to come about.
The GNU General Public License permits making a modified version and
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The GNU Affero General Public License is designed specifically to
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An older license, called the Affero General Public License and
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Notwithstanding any other provision of this License, if you modify the
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
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<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
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Also add information on how to contact you by electronic and paper mail.
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You should also get your employer (if you work as a programmer) or school,
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For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.
README.md
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# MOPAC harness
Headless multi-vertical agent harness in Go. AGPLv3. SoR: Redmine project MOPAC; docs: Discourse; code: Gitea reachableceo/MOPAC.
Spec: DESIGN.md. Status: see Redmine MOPAC project issues.
docs/PORTING-NOTES-crush.md
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# Porting notes: crush (reference/crush @ internal/)
Scope for MOPAC harness: MCP client, sessions/resume, provider routing,
headless loop; OAuth deferred (LiteLLM key suffices). Paths relative to
`reference/crush/`; line refs from study 2026-08-28, drift possible.
## 1. MCP plumbing
Code in `internal/agent/tools/mcp/` (NOT `internal/client/` = daemon RPC).
Uses official SDK `modelcontextprotocol/go-sdk/mcp`.
Config: `crush.json` top-level `"mcp"` map name->MCPConfig
(`config/config.go:185-252`, :383/:723):
```json
{ "mcp": {
"local": { "type": "stdio", "command": "npx", "args": ["-y","pkg"], "env": {"K":"V"} },
"remote": { "type": "http", "url": "http://h/mcp", "headers": {"Authorization":"Bearer $TOKEN"} },
"legacy": { "type": "sse", "url": "https://h/sse" } } }
```
- `type`: `stdio`|`sse`|`http` (http=streamable). Extras: `disabled`,
`enabled_tools`/`disabled_tools`, `timeout` secs (dflt 10s, 30s OAuth),
`sessionless`, `oauth*`. `$VAR`/`$(cmd)` expansion: config.go:438-528.
PORT FORMAT VERBATIM for KNEL-AIMiddleware compat.
Transports (`mcp/init.go:1035-1195` createTransport): stdio ->
`mcp.CommandTransport`; env=os.Environ()+resolved; child in own process
group, group SIGKILL + 5s WaitDelay (`process_unix.go:22-40`). PORT:
process-group kill or zombies leak. http -> `mcp.StreamableClientTransport`;
static headers via `headerRoundTripper` (init.go:1197-1206). sse ->
`SSEClientTransport` (legacy, keep for compat).
Health/restart: `getOrRenewClient` (init.go:659-771) — Ping fast path; on
failure teardown->reconnect->re-register tools. Per-server renewal mutex +
generation counters discard stale connects. Config-change reconcile
single-flighted (`mcp/lifecycle.go:45-125`). Init: per-server goroutines +
WaitGroup; `WaitForInit` gates NON-interactive runs only (headless waits,
TUI proceeds lazily).
Tool registration: discovery via `ListTools` on connect + list-changed
subscription (`mcp/tools.go:147-169`). Naming `mcp_<server>_<tool>` SINGLE
underscores (`agent/tools/mcp-tools.go:58-60`). Adapter maps JSON-Schema
properties/required -> ToolInfo (mcp-tools.go:70-97); results map
text/image/audio, base64-normalized (`tools.go:54-108`). Routing: RunTool ->
client lookup -> CallTool; auto-renews first. Aggregation: per-run palette =
built-ins + `GetMCPTools`, filtered per-agent by AllowedMCP map
(`agent/coordinator.go:768-790`).
Go port: adopt `go-sdk/mcp`; copy config schema, naming convention,
renewal-with-generations, WaitForInit gate. Skip: Claude "channel" push
hack (`mcp/channel.go`), docker-mcp gateway (`config/docker_mcp.go`).
## 2. Session/persistence
Single SQLite DB `{dataDir}/crush.db` (default `.crush/` per project,
discovered cwd-up-to-git-root, `config/load.go:574-582`). Sibling
`crush.lock` flock + owner JSON stops concurrent processes
(`db/datadirlock.go`). Schema (`db/migrations/`, goose, sqlc queries in
`db/sql/`): `sessions(uuid, parent_id, title, message_count, tokens, cost,
todos JSON, summary_message_id)`, `messages(id, session_id, role, parts
JSON, model, provider, finished_at)`, `files` (snapshots), `read_files`
(tracker). Parts = `{"type","data"}` array (`message/content.go:56-143`).
Pragmas WAL+busy_timeout=30s; `SetMaxOpenConns(1)` avoids SQLITE_NOTADB
(`db/connect.go:18-41,137-142`). Short user ID = XXH3 hex of UUID
(`session/session.go:28-32`).
`-C/--continue` vs `-s/--session` (mutually exclusive, `cmd/root.go:63`):
Continue = GetLast `ORDER BY updated_at DESC` skipping agent-tool/child
sessions (`app/app.go:238-263`). ID resolve: exact UUID, else XXH3 prefix
scan; 0 hits=not found, >1=ambiguous (`root.go:941-967`). Resume restores
messages+parts, file snapshots, read-files, model from last assistant msg;
NOT restored: permissions, LSP/MCP (re-init).
Crash safety: 33ms debounced writes, sync flush on terminal events
(`message/message.go:218-302`); read-time repair in `agent/agent.go:1527-1708`
— drops orphaned tool results, SYNTHESIZES results for orphaned tool_calls
(interrupted sessions still pass API validation), skips empty cancelled msgs.
PORT THIS — it is what makes resume robust. Harness v1 (bounded turns):
JSONL per session is acceptable; what matters is the repair pass and
finished_at-only-on-Finish-part semantics.
## 3. Provider layer
No in-house LLM client: calls delegate to external `charm.land/fantasy`;
catalog from `charm.land/catwalk`. Neither vendored here — harness owns
this layer against LiteLLM (openai-compat): port the CONFIG CONTRACT, not code.
- Catalog: embedded + remote fetch (catwalk.charm.land, ETag) w/ fallback
remote->cache->embedded (`config/catwalk.go:37-90`, `provider.go:37-90`;
cache `~/.local/share/crush/providers.json`, atomic write). Harness:
static embedded catalog, no remote sync.
- Layering low->high (`config/load.go:926-965`): /etc/crush ->
~/.config/crush -> ~/.local/share/crush -> project walk (.crushrc|crushrc|
.crush.json|crush.json, cwd up to worktree root) -> workspace dataDir copy
LAST. Deep-merge via go-jsons.
- Catalog x user (`load.go:213-365`): `providers.<id>` overrides
base_url/api_key/extra_headers; user `models[]` PREPENDED, wins by ID;
`disable_default_providers` nukes catalog.
- Routing: `parseModelStr` (`app/provider.go:15-27`) — first `/`-segment
vs provider IDs, else whole string is model ID; multi-provider hit ->
error demanding `provider/model`. Defaults from catalog
DefaultLarge/SmallModelID (`load.go:716-789`); per-model overrides
(max_tokens, temperature, reasoning) `load.go:826-899`. Provider
construction switch on Type `agent/coordinator.go:806-1161`.
- Retries: INSIDE fantasy, not this repo. Crush only observes: `OnRetry`
resets streamed content so retry doesn't concatenate (`agent/agent.go:931-941`);
`OnAuthRefresh` = transparent 401 retry (:127). PORT: harness-layer retry
(429/5xx/transport backoff) + reset partial assistant buffer first.
Stream-truncation surfacing (z.ai "Message content shorter than read
bytes"): stream errors classified at `agent/agent.go:1067-1189`;
`IsTransportError` -> FinishReasonError w/ wrapped err (:1177) — unexpected
EOF lands here. In headless, the z.ai-class error is DETECTED at
`app/app.go:414-416` (reconciles streamed bytes vs final msg, fails the
run, exit 1). Zero-usage fallback: `agent/usage_fallback.go`. Harness v1:
on EOF/short-read, retry request (per DESIGN retry/backoff) and resume
turn from persisted messages; reuse delta-cursor print (app.go:406-431).
## 4. Headless mode
No `-p`/`--print` exists. Headless = `crush run|r [prompt...]`
(`cmd/run.go:31-169`). Prompt = args joined + stdin (pipe/file, not TTY)
PREPENDED (`root.go:918-935`); empty -> error. Output: plain markdown to
stdout; spinner only if stderr is TTY. Flags: -q, -v, -m provider/model,
--small-model, -s, -C. Two paths: in-process (`app.RunNonInteractive`,
`app/app.go:267-438`) or client/server SSE (`run.go:334-455`). Port:
- Delta printing: track messageReadBytes per msg id, print only
`content[readBytes:]` (app.go:406-431). Server path keys completion on
RunComplete event by runID, NOT message finish (tool_use mid-turn
regression, run.go:385-397).
- Permissions headless: session auto-approved wholesale
(`AutoApproveSession` app.go:349; permission.go:280-284) — never blocks;
interactive-only tools excluded (`initCoderAgent(false)` app.go:674-703).
Harness: invert — per-vertical allowlist, deny-default, no auto-approve.
- Exit codes: 0/1 only. 1 = RunE error (no prompt, no providers, agent
error, run failed); CANCEL returns 0 (app.go:398-401); tool failures do
NOT affect exit. Harness: distinct codes gate/budget/agent/tool.
## 5. OAuth (deferred v1 — code map)
- Hyper device-code flow: `oauth/hyper/device.go` (:40 initiate, :87 poll,
:153 refresh-exchange). Copilot device flow + GH->Copilot token exchange:
`oauth/copilot/oauth.go` (:36,:69,:149), disk import `copilot/disk.go`,
spoof headers `copilot/http.go`. Login CLI: `cmd/login.go`, `cmd/logout.go`.
- MCP OAuth 2.1 auth-code+PKCE, dynamic client registration (RFC 7591),
PR metadata (8414/8707): `oauth/mcp/handler.go:110-219`. Loopback
`/callback`, ports 40704-40713 first-free (pin via `oauth_callback_port`);
listener bound only during in-flight auth (:487); concurrent 401s deduped
to one browser tab (`authFlight` :420). Tokens -> config key
`mcp.<name>.oauth_token`; save-on-change wrapper
`oauth/mcp/savingtokensource.go`. Browser suppressed non-interactive
(`ErrInteractiveAuthRequired` handler.go:32). If harness needs OAuth,
port THIS flow (MCP); provider OAuth moot behind LiteLLM.
Token plumbing: access token stored AS `providers.<id>.api_key`
(`config/store.go:564-595`); refresh singleflight + cross-process flock
`<datadir>/locks/<provider>.refresh.lock`, adopts peer-rotated token
(store.go:658-903). Token model `oauth/token.go`. Anthropic Claude-
subscription OAuth: REMOVED (`config/load.go:306-314`).
## 6. Reading list + gotchas
Top 10 to read in detail during build:
1. `internal/agent/tools/mcp/init.go` (1332 ln) — sessions, transports,
renewal; MCP port blueprint.
2. `internal/agent/tools/mcp-tools.go` + `mcp/tools.go` — tool adapter,
naming, filtering, result mapping.
3. `internal/agent/agent.go` (2288 ln) — stream callbacks, error
classification, prompt repair (:1527-1708).
4. `internal/app/app.go` — RunNonInteractive, resolveSession, delta print.
5. `internal/cmd/run.go` + `cmd/root.go` — headless flags, stdin handling,
config discovery walk.
6. `internal/config/load.go` — config layering/merge, model resolution.
7. `internal/message/message.go` + `content.go` — debounced persistence,
part model.
8. `internal/session/session.go` + `db/sql/` — session service + queries.
9. `internal/permission/permission.go` — precedence chain (skip ->
allowed_tools -> hook -> auto-approve -> interactive).
10. `internal/agent/coordinator.go` — tool palette assembly, provider
construction, AllowedMCP filtering.
Gotchas:
1. `internal/client/` is daemon RPC, not LLM/MCP — don't port by name.
LLM lives in external `charm.land/fantasy` (not vendored here).
2. MCP tool names use SINGLE underscores (`mcp_server_tool`); double-
underscore assumption breaks KNEL compat.
3. stdio MCP children need own process group + group kill; plain Kill
orphans grandchildren (`process_unix.go`).
4. Retries concatenate partial stream output unless the assistant buffer
is reset first (`agent.go:931-941` OnRetry pattern).
5. Resume correctness lives in read-time repair (orphaned tool_call/result
synthesis), not write-time transactions — skipping it makes every
interrupted session permanently API-invalid.