type: user/message

type: text

text: Exercise the six PTY tools in order, including one missing-session signal error, then reply DONE.

kind: user

role: user

surfaceOp: append


type: session/title

title: Exercise the six PTY tools

kind: fallback


type: request/header

provider: deepseek

[System]
You are an AI agent powered by the DeepSeek Harness SDK.

You are headless-agent, a coding assistant powered by the deepseek-v4-flash model.

Verify your work by running the code or tests. Keep answers brief and
factual.

Use the read tool — not shell commands like cat — to inspect text files. Results include line numbers. Use offset and limit to continue reading large files.

Use the write tool to create files or completely replace file contents. Existing files are overwritten, so read an existing file first (the default fs-policy requires it) and prefer edit for targeted changes.

Use the edit tool for targeted changes to existing UTF-8 text files. It replaces literal old_string with new_string; by default old_string must appear exactly once. If old_string appears multiple times, provide a more specific old_string or set replace_all to true. Read the file first (the default fs-policy requires it), unless you just created or edited it in this session.

Check the [exit code: N] marker on every bash result; investigate failures before moving on.

Use a terminal session only when work needs persistent terminal state or interactive stdin; prefer bash/read/write/edit for bounded one-shot operations. Track every terminal session id and close sessions that no longer matter. An inferred_idle or timeout result does not prove the foreground command exited.

Track every background task id you start. You are notified in-session when a task finishes — do not busy-poll or sleep on one; keep working on independent steps and do not duplicate a running task's work. Before giving a final answer, collect every still-relevant task with task_output (set wait: true only when you are genuinely blocked on it), and task_kill tasks that stopped mattering.

Use the workflow tool ONLY when the user explicitly asks for a workflow or for large multi-agent orchestration: you write a JavaScript script (the tool description documents the exact format) that fans work out across many subagents with phases and structured results. For one or two delegations, prefer plain subagent calls.

Use the ralph tool ONLY when the direct human explicitly asks for a Ralph loop or fresh-agent iterative execution. Each Ralph round starts a fresh child with no conversation seed and uses the shared workspace as durable memory. Completion and blockers are worker reports, not independent evaluation. Use same-session goal tools for ordinary long-running objectives, and plain subagents or workflows for bounded delegation and fan-out.

bash

description: Execute a bash command (`bash -c`) and return its stdout/stderr. Each call runs in a fresh shell: no state (cwd, variables, functions) persists between calls — pass `workdir` instead of using `cd`. Non-zero exits are reported as `[exit code: N]`. Current harness environment facts are exposed through managed `$DSH_*` variables; inspect them when needed. Commands may run under a file sandbox; a blocked file operation is reported as `[sandbox: file access denied under <mode> mode]` — a policy denial, not a bug in the command; do not retry another way. Long output is truncated to its tail; the full output is saved to a file whose path is reported when available. Set `run_in_background: true` for long-running commands: the call returns a task id immediately; read its output with `task_output` and stop it with `task_kill`.

type: object

type: string

description: The bash command to execute.

description: Clear, concise description of what this command does in active voice, 5-10 words (shown in the UI). Examples: "ls" → "List files in current directory"; "git status" → "Show working tree status"; "npm install" → "Install package dependencies".

type: number

description: Timeout in milliseconds. The executor applies its configured default and cap, and kills the command on expiry.

description: Working directory for this command. Defaults to the session workspace; a relative path is resolved against it.

type: boolean

description: Run in the background and return a task id immediately (collect with task_output, stop with task_kill). No timeout applies.

required: command description

edit

description: Edit an existing UTF-8 text file by replacing literal text.

description: Path to edit, resolved by the filesystem backend.

description: Literal text to replace. Must match exactly.

description: Literal replacement text. Use an empty string to delete the match.

description: Replace all matches. Defaults to false; when false, old_string must appear exactly once.

ralph

description: Run a foreground fresh-agent Ralph loop toward one immutable objective. Use only when the direct human explicitly asks for Ralph or fresh-agent iteration. Each round opens a new child with no parent conversation or prior child session; the shared workspace is long-term memory, and only a bounded structured report crosses rounds. The call returns when a worker reports completion or a concrete blocker, or at the round limit. Ordinary long-running same-session work belongs to goal tools.

description: The immutable completion objective for every fresh Ralph round.

description: Optional positive safe-integer round cap, bounded by the deployment ceiling.

read

description: Read a UTF-8 text file and return line-numbered content.

description: Path to read, resolved by the filesystem backend.

description: 1-based first line to return. Defaults to 1.

description: Maximum number of lines to return. Defaults to 2000.

skill

description: Load the full instructions for an available skill. Call this with the exact skill name from the session skill catalog before acting on a task that names or clearly matches that skill.

description: The exact skill name from the available skills list.

subagent

description: Delegate a self-contained task to a subagent (a separate agent that works in its own context) and return its final result. Use this to offload focused, independent work — research, a scoped implementation, an analysis — so it does not consume this conversation's context. The subagent runs to completion and you receive only its final answer, not its intermediate steps. Give it a complete, standalone prompt: it does not see this conversation. Set `run_in_background: true` to return a task id; collect with `task_output` and stop with `task_kill`.

description: A short (3-5 word) description of the delegated task, for display.

description: The complete, self-contained task for the subagent. It does not share this conversation's context, so include everything it needs.

description: Run as a background task and return its id; collect with task_output or stop with task_kill.

required: description prompt

description: Delegate a task to a subagent that inherits this conversation: a child agent seeded with all completed turns so far (it does not see the current in-flight turn), returning only its final result. Use this when the subtask builds on this conversation's context — a follow-up analysis, a review, a continuation — without consuming this conversation's context for the work itself. You receive only its final answer, not its intermediate steps. Set `run_in_background: true` to return a task id; collect with `task_output` and stop with `task_kill`.

description: The task for the subagent. It already sees this conversation's completed turns, so build on them freely and state only what is new.

description: Request cancellation of a running background task by task id. Returns immediately; the task settles as killed once its work actually stops.

description: Task id returned by the tool that started the background work.

description: Optional short reason, recorded in the log and forwarded to the task.

description: List your background tasks (running and finished) with their ids, kinds, and statuses.

description: Read a background task. Stream tasks return only output since the previous read; final-output tasks return their result after settlement. Every response ends with `[status: ...]`. Reads are non-blocking unless `wait: true`, which waits up to the configured cap.

description: Block until the task reaches a terminal status or the timeout expires. A timed-out wait returns [status: running] and leaves the task alive.

description: Max wait in milliseconds (only meaningful with wait: true). Defaults to the configured wait timeout; capped by the configured maximum.

description: Close one persistent terminal and wait until its captured owned process tree is gone.

description: Terminal session id.

description: List persistent terminal sessions owned by the current agent.

description: Create a persistent, owner-isolated terminal session from a registered backend type. Use this for shell or REPL state that must survive across tool calls.

description: Registered terminal backend type, usually "shell".

description: Optional owner-local display name such as "main" or "gdb".

description: Initial working directory. Defaults to the deployment workspace root.

description: Read a bounded page of retained output from a persistent terminal without sending input.

description: Terminal session id.

description: Newest-relative line offset (default 0).

description: Requested line count (default 500; backend caps apply).

description: Send text to a persistent terminal. By default Enter is submitted and the call waits for a prompt, stdin wait, output silence, timeout, or session exit. Background mode returns a task id for task_output/task_kill.

description: Terminal session id returned by terminal_open or terminal_list.

description: UTF-8 text to write to the terminal.

description: Submit Enter after text (default true). Set false for control characters or incomplete REPL input.

description: Return a task id immediately; collect with task_output or stop with task_kill.

required: sessionId text

description: Send an allowed signal to the current foreground process group of a persistent terminal.

description: Terminal session id.

description: Signal to deliver. Shell-targeted SIGKILL is rejected; use terminal_close.

enum: SIGINT SIGTERM SIGKILL SIGTSTP SIGHUP

required: sessionId signal

description: Record and update a structured task list for the current work. Send the ENTIRE list every call — it REPLACES the previous list (there are no partial updates, no per-item edits). Use it to plan multi-step work and show progress: add one todo per concrete step before you start. Keep AT MOST ONE todo `in_progress` at a time; while work remains, exactly one active task should be `in_progress`. Mark a todo `completed` the moment it is done (do not batch completions), and allow no `in_progress` item only once all work is complete. Skip the list for trivial single-step tasks. Statuses: `pending` (not started), `in_progress` (being worked on now), `completed` (finished).

type: array

description: The COMPLETE task list, replacing any previous list.

description: What the task is — a short imperative line.

description: pending (not started) | in_progress (now) | completed (done).

enum: pending in_progress completed

required: content status

workflow

description:
Run a JavaScript workflow script that orchestrates subagents at scale. Use this for work that fans out across many independent pieces — an audit over many files, a migration, multi-angle research, adversarial verification of findings — where you write the orchestration as a script instead of delegating turn by turn.

The workflow's identity rides the `meta` parameter as JSON: required `name` (short kebab-case) and `description` strings, optional `whenToUse` string and `phases` array (`{title, detail?, provider?, model?}`). The `script` parameter is the plain JavaScript body ONLY (NOT TypeScript, and NO `export const meta` statement — meta is a parameter, not code), running with top-level await; end with `return <value>` — the value must be JSON-serializable and is this tool's result.

Script-body hooks:
- `agent(prompt, opts?): Promise<any>` — run one subagent to completion. Without `opts.schema` it resolves to the child's final text; with `opts.schema` (an object-rooted JSON Schema using ONLY type/properties/required/additionalProperties/items/enum/const/oneOf — no pattern/format/numeric bounds) it resolves to the validated object. Resolves `null` when the child fails (filter with `.filter(Boolean)`). Other opts: `label` (display), `phase` (progress group), and independent `provider`/`model` LLM target overrides (either may be provided alone). Anything else (`effort`/`isolation`/`agentType`) is rejected loudly.
- `pipeline(items, ...stages): Promise<any[]>` — run each item through the stages independently with NO barrier between stages (prefer this for multi-stage work). Each stage receives `(prev, item, index)`. An ordinary stage throw drops that ITEM to `null` and skips its remaining stages.
- `parallel(thunks): Promise<any[]>` — run zero-argument functions concurrently and await ALL of them (a barrier; use only when a stage genuinely needs every prior result together). A throwing thunk resolves to `null`.
- `phase(title)` — start a progress phase; `log(message)` — narrate progress; `args` — the tool call's `args` input, verbatim.

Misused hooks (bad arguments, unknown options, unsupported schemas, tripped caps) throw errors that ALWAYS kill the script — they never dissolve into a per-item `null`.

Constraints: concurrency and total-agent caps apply; no filesystem, network, timers, or Node.js APIs are provided — the agents do the work, the script only coordinates them. The run executes in the foreground: this call returns when the whole script finishes.

description: The plain-JS workflow script body (top-level await allowed; NO `export const meta` statement; end with `return <json-value>`).

description: The workflow identity block (plain JSON — never code).

description: Short kebab-case workflow name.

description: One-line description of what the workflow does.

description: Optional guidance on when this workflow applies.

description: Optional phase declarations matched by phase() calls.

description: The phase title phase() calls match by exact string.

description: Optional one-line description of the phase.

description: Optional provider override this phase is expected to use.

description: Optional model override this phase is expected to use.

required: name description

description: Optional JSON input exposed to the script as the `args` global (wrap a bare list as a field, e.g. {"files": [...]}).

required: script meta

write

description: Create or fully replace a UTF-8 text file.

description: Path to write, resolved by the filesystem backend.

description: Full UTF-8 text content to write.

reason: initial


type: assistant/message

role: assistant

type: tool-call

main

type: shell

kind: model


type: tool/result

kind: tool

callId: pty-spawn

type: tool-result

toolCallId: pty-spawn

text:
started terminal session pty-1 (main) [type: shell]
dsh>


type: assistant/chunk

type: tool-call-delta

text: printf 'PTY_OK\n'


type: block-end

text: printf 'PTY_OK\n'


text: printf 'PTY_OK\n'


type: tool/call

callId: pty-send

text: printf 'PTY_OK\n'


toolCallId: pty-send

type: text

text:
K
dsh>
[wait: stdin_read]
[session: running]
[output truncated]

viewport:
printf 'PTY_OK\n'
PTY_OK
dsh>

kind: running


callId: pty-read

toolCallId: pty-read

text:
dsh> printf 'PTY_OK\n'
PTY_OK
dsh>
[lines: 0-3 of 3]


sessionId: pty-missing

signal: SIGINT


callId: pty-signal

toolCallId: pty-signal

text: Error: unknown PTY session pty-missing


callId: pty-kill

toolCallId: pty-kill

text: closed terminal session pty-1


callId: pty-list

toolCallId: pty-list

text: (no terminal sessions)


type: text-delta

text: DONE


text: DONE


text: DONE