docs(roadmap): add #349 — tokens/stats/cost identical output, no context-window utilisation

Author: code-yeongyu

ROADMAP.md

@@ -6283,3 +6283,5 @@ Original filing (2026-04-18): the session emitted `SessionStart hook (completed)
 341. **Resume-safe `/tasks --output-format json` emits an unsupported-command JSON error only on stderr and mixes `kind` with `type` classification vocabularies** — dogfooded 2026-04-29 for the 16:00 nudge on current `origin/main` / rebuilt `./rust/target/debug/claw` with embedded `git_sha` `58569131`. Running `./rust/target/debug/claw --resume latest /tasks --output-format json` wrote no stdout bytes, but wrote a JSON error object to stderr: `{"command":"/tasks","error":"/tasks is not yet implemented in this build","kind":"unsupported_command","type":"error"}`. The unsupported command envelope therefore has two separate top-level classification vocabularies (`kind=unsupported_command` and `type=error`) and places the only parseable payload on stderr, while successful JSON commands use stdout and a `kind`-only classification. This is distinct from #340 because it is not session help; it shows implemented-but-unsupported command stubs can emit a dual-vocabulary error envelope. **Required fix shape:** (a) in `--output-format json` mode, emit the primary JSON envelope on stdout for unsupported resumed slash commands such as `/tasks`; (b) document and use one error discriminator, preferably `kind:"error"` plus `code:"unsupported_command"`, or `kind:"unsupported_command"` plus `status:"error"`, but not `type`; (c) reserve stderr for non-primary diagnostics or text-mode prose, never as the sole JSON payload; (d) add regression coverage for `/tasks` under `--resume` with JSON output proving stdout contains the structured error envelope, stderr is not the only parseable stream, and the envelope uses the documented single-vocabulary discriminator. **Why this matters:** claws need the same stdout JSON contract for implemented successes and implemented-but-unsupported stubs. If `/tasks` errors can silently move to stderr and advertise both `kind` and `type`, automation must special-case command stubs instead of applying one JSON error parser. Source: gaebal-gajae dogfood follow-up for the 16:00 nudge on rebuilt `./rust/target/debug/claw` `58569131`.
 342. **Resume-safe `/commands --output-format json` is rejected as an unknown slash command even though the error points users at `/help` for slash-command discovery, leaving no structured command-index alias** — dogfooded 2026-04-29 for the 16:30 nudge on current `origin/main` / rebuilt `./rust/target/debug/claw` with embedded `git_sha` `f65b2b4f`. Running `./rust/target/debug/claw --resume latest /commands --output-format json` wrote no stdout bytes and emitted only stderr JSON: `{"command":"/commands","error":"Unknown slash command: /commands\n  Help             /help lists available slash commands","type":"error"}`. In the same rebuilt binary, `./rust/target/debug/claw --resume latest /help --output-format json` succeeded on stdout but exposed only prose keys `kind,text`. The discoverability path therefore has two gaps at once: the intuitive `/commands` index/alias is unavailable, and the fallback suggestion is buried inside an error string rather than surfaced as structured `suggested_command` / `discovery_command` metadata. This is distinct from #340 and #341: the pinpoint is not merely stderr-only JSON error placement, but the absence of a machine-readable slash-command discovery alias/index and typed correction guidance when users or claws try the natural `/commands` form. **Required fix shape:** (a) either implement `/commands` as a resume-safe alias for slash-command discovery or return a typed `unknown_command` JSON envelope with `suggested_command:"/help"` and `discovery_command:"/help"` fields; (b) make the primary JSON error envelope follow the stdout JSON contract and single-discriminator schema from #340/#341; (c) expose structured slash-command inventory from the discovery surface rather than requiring callers to scrape `text`; (d) add regression coverage proving `/commands --output-format json` either returns the structured command inventory or returns a structured correction that automation can follow without parsing prose. **Why this matters:** claws need a predictable way to discover valid slash commands before invoking them. If the natural command-index spelling fails with stderr-only JSON and a human-formatted hint, orchestration has to guess, parse prose, and special-case command discovery before it can even learn the supported command surface. Source: gaebal-gajae dogfood follow-up for the 16:30 nudge on rebuilt `./rust/target/debug/claw` `f65b2b4f`.
 343. **Resume-safe `/models --output-format json` suggests `/model` as a correction even though `/model` is itself unsupported in the same resume-safe JSON path** — dogfooded 2026-04-29 for the 17:00 nudge on current `origin/main` / rebuilt `./rust/target/debug/claw` with embedded `git_sha` `a1bfcd41`. Running `./rust/target/debug/claw --resume latest /models --output-format json` wrote no stdout bytes and emitted stderr JSON: `{"command":"/models","error":"Unknown slash command: /models\n  Did you mean     /model, /tokens\n  Help             /help lists available slash commands","type":"error"}`. Immediately following the suggested correction with `./rust/target/debug/claw --resume latest /model --output-format json` also wrote no stdout bytes and returned `{"command":"/model","error":"unsupported resumed slash command","type":"error"}`. The correction path therefore points automation from an unknown plural form to a command that cannot run in the same resume-safe noninteractive mode, while `/tokens --output-format json` succeeds and exposes only token counters. This is distinct from #342's missing `/commands` discovery alias: the pinpoint here is dead-end suggestion quality and resume-safety awareness in `Did you mean` guidance. **Required fix shape:** (a) make unknown-command suggestions context-aware so resume-mode JSON only suggests commands that are actually resume-safe for the current invocation, or labels non-resume-safe suggestions with `resume_safe:false`; (b) expose suggestions as structured `suggestions[]` objects with `command`, `resume_safe`, `reason`, and optional `replacement_for` fields instead of burying them in the `error` string; (c) if `/model` remains interactive-only, suggest a machine-readable status/config/model inspection command that works under `--resume`, or return a typed `interactive_only` blocker; (d) add regression coverage proving `/models --output-format json` does not recommend an unusable `/model` command without structured resume-safety metadata. **Why this matters:** claws follow correction hints automatically. A suggestion that leads straight into another unsupported resumed slash command turns error recovery into a loop and makes command discovery less trustworthy than no suggestion at all. Source: gaebal-gajae dogfood follow-up for the 17:00 nudge on rebuilt `./rust/target/debug/claw` `a1bfcd41`.
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+349. **`/tokens`, `/stats`, and `/cost` return identical JSON payloads — three commands with distinct names produce the same output, and none includes context-window utilisation** — dogfooded 2026-04-30 by Jobdori on `a510f73`. Running each command in `--output-format json` mode: `/tokens` returns `{"kind":"stats","input_tokens":0,"output_tokens":0,...}` (kind says "stats"), `/stats` returns `{"kind":"stats",...}`, `/cost` returns `{"kind":"cost",...}`. All three share the same token-count fields and differ only in `"kind"`. None includes: `context_window` (model's max tokens), `context_used` (tokens in current context), `context_remaining` (available headroom), `context_utilisation_pct`, or `estimated_cost_usd`. An orchestration layer that needs to check "am I about to overflow the context window?" cannot use any of these three commands — it must independently know the model's context size and manually subtract cumulative token counts, which requires tracking across calls. **Required fix shape:** (a) give each command a meaningful, distinct payload: `/tokens` → context-window utilisation (`context_window`, `context_used`, `context_remaining`, `utilisation_pct`); `/stats` → cumulative turn/message counts and per-turn averages; `/cost` → monetary spend with `cost_usd` and rate breakdown; (b) if overlap is intentional, document the hierarchy in `/help --output-format json` so callers know which command to use for which purpose; (c) add regression coverage ensuring `/tokens`, `/stats`, and `/cost` return non-identical payloads and that `/tokens` includes a `context_window` field. Source: Jobdori live dogfood, mengmotaHost, `a510f73`, 2026-04-30.