docs(roadmap): add #399 — history --output-format json sends error to stderr only; dual kind/type vocab

ROADMAP.md

@@ -6301,4 +6301,4 @@ Original filing (2026-04-18): the session emitted `SessionStart hook (completed)
 380. **Top-level `tokens --help --output-format json` hangs with zero stdout/stderr instead of returning bounded command help JSON** — dogfooded 2026-04-30 for the 02:30 nudge on current `origin/main` / rebuilt `./rust/target/debug/claw` with embedded `git_sha` `d95b230c`. After verifying #358 covered `cost --help`, a fresh adjacent probe on the token-budget surface showed the same silent failure class: repeated bounded runs of `timeout 8 ./rust/target/debug/claw tokens --help --output-format json` exited `124` with `stdout=0` and `stderr=0`. In the same rebuilt binary, `version --output-format json` returned promptly with version/build metadata, proving the binary itself and JSON output path are reachable. This is distinct from #358's cost help hang: the affected surface is the sibling `tokens` command help, which agents use before estimating prompt/session token budgets. **Required fix shape:** (a) make `tokens --help --output-format json` return static/bounded stdout JSON with `kind:"help"` or `kind:"tokens"`, `action:"help"`, usage, options, examples, supported output formats, and related slash/direct commands; (b) ensure help rendering does not initialize slow token accounting, session, or provider state; (c) if any dynamic provider is consulted, return a typed JSON timeout/unavailable error instead of hanging; (d) add regression coverage proving tokens help in JSON mode returns within a deterministic budget. **Why this matters:** token budgeting is a preflight clawability surface. If help hangs silently, automation cannot safely discover how to inspect or constrain token usage before running expensive prompts, and budget-aware wrappers stall at the discovery step. Source: gaebal-gajae dogfood follow-up for the 02:30 nudge on rebuilt `./rust/target/debug/claw` `d95b230c`.
 381. **Top-level `cache --help --output-format json` hangs with zero stdout/stderr instead of returning bounded command help JSON** — dogfooded 2026-04-30 for the 03:00 nudge on current `origin/main` / rebuilt `./rust/target/debug/claw` with embedded `git_sha` `d95b230c`. After #358 and #380 landed for the cost/tokens preflight help hangs, a fresh adjacent probe on the cache-control surface showed the same silent failure class: repeated bounded runs of `timeout --kill-after=1s 8s ./rust/target/debug/claw cache --help --output-format json` exited `124` with `stdout=0` and `stderr=0`. In the same rebuilt binary, `version --output-format json` returned promptly with version/build metadata, proving the binary itself and JSON output path are reachable. This is distinct from the separate `/cache` slash-command envelope mismatch class: the affected surface here is top-level `cache` command help, where agents need bounded local discovery before deciding whether to inspect, clear, or summarize cache state. **Required fix shape:** (a) make `cache --help --output-format json` return static/bounded stdout JSON with `kind:"help"` or `kind:"cache"`, `action:"help"`, usage, options, examples, supported output formats, and related slash/direct commands; (b) ensure help rendering does not initialize slow cache/session/provider state; (c) if any dynamic provider is consulted, return a typed JSON timeout/unavailable error instead of hanging; (d) add regression coverage proving cache help in JSON mode returns within a deterministic budget. **Why this matters:** cache inspection and cleanup are recovery/control-plane operations. If cache help hangs silently, claws cannot safely discover cache semantics before attempting cleanup, and automation stalls before it can choose a non-destructive cache action. Source: gaebal-gajae dogfood follow-up for the 03:00 nudge on rebuilt `./rust/target/debug/claw` `d95b230c`.
 
-415. **`config <section> --output-format json` returns `merged_keys:int` (a count) with no actual merged key-value pairs — automation cannot read the resolved configuration values from JSON** — dogfooded 2026-04-30 by Jobdori on `e939777f`. Running `claw config env --output-format json`, `claw config model --output-format json`, or `claw config hooks --output-format json` all return an identical five-key envelope: `{"cwd":"...","files":[...],"kind":"config","loaded_files":2,"merged_keys":1}`. The `merged_keys` field is an integer count of how many keys were merged across the loaded files, not an object or array of the actual key names and resolved values. The `files` array shows which config files were loaded/missing but contains no per-file key-value content. The merged section content — the actual resolved `env`, `model`, or `hooks` configuration — is entirely absent from the JSON output. It only appears in the prose output as a "Merged section: env / <value>" block. **Required fix shape:** (a) add a `merged` or `resolved` object/array field to the JSON envelope containing the actual key-value pairs that resulted from merging the loaded config files for the requested section; (b) rename `merged_keys` from an integer count to either remove it (derivable from `len(merged)`) or keep it as a companion count field; (c) for each entry in `merged`, include `key`, `value`, and optionally `source_file` so automation can attribute which file contributed the value; (d) add regression coverage proving `config env --output-format json` with a non-empty env section populates `merged` (or equivalent) with the actual resolved key-value pairs. **Why this matters:** the entire purpose of `config env/model/hooks --output-format json` is to allow automation to read the resolved runtime configuration without screen-scraping prose. Returning only a count defeats the purpose and forces callers to either re-parse the prose output or re-read and merge the source config files themselves. Source: Jobdori live dogfood, `e939777f`, 2026-04-30.
+399. **`claw --output-format json history` sends its error JSON to stderr only, leaving stdout empty; the error envelope uses dual classification vocabularies `kind:"unknown"` and `type:"error"` simultaneously — contradicting the single-vocabulary discriminator established for non-error JSON envelopes** — dogfooded 2026-04-30 by Jobdori on `e939777f`. Running `./claw --output-format json history` exits `1`, stdout is empty, stderr contains `{"error":"\`claw history\` is a slash command. Use \`claw --resume SESSION.jsonl /history\` or start \`claw\` and run \`/history\`.","hint":null,"kind":"unknown","type":"error"}`. The JSON-mode stdout contract is therefore violated even for commands that fail early with a hint: the only parseable payload is on stderr and uses both `kind` and `type` as competing discriminators. This pattern is also present in `plugins uninstall` (#353) and slash-command errors (#340-343). **Required fix shape:** (a) in `--output-format json` mode, emit all primary JSON error envelopes on stdout; (b) unify the discriminator: use `kind:"error"` + `code:"slash_command_only"` or `kind:"slash_command_redirect"` + `status:"error"`, but never both `kind` and `type` as sibling top-level discriminators; (c) populate `hint` with a structured `{command, resume_safe, examples[]}` object rather than a null placeholder; (d) add regression coverage for `history --output-format json` proving stdout contains the JSON error envelope and the envelope uses the documented single discriminator. Source: Jobdori live dogfood, `e939777f`, 2026-04-30.