Overview

dsh-tool-bash-persistent

Model-facing bash(command) backed by one owner-scoped ctx.terminals shell. The package owns the tool contract and shell reuse; deployments select the PTY backend and sandbox policy.

BUILT-IN / ATOMIC

Already shipped with DSH — no separate install

This is an atomic module already shipped with Harness, not a standalone profile layer.

Capabilities

What it contributes

HostCordis loadableConfigurable

Client / UIHost only0 contributions

Model tools0None declared

Profile stateabsentpreset:minimal

README / EN

Package documentation

@deepseek-ai/dsh-tool-bash-persistent

English | 中文

Model-facing bash(command) backed by one owner-scoped ctx.terminals shell. The package owns the tool contract and shell reuse; deployments select the PTY backend and sandbox policy.

Config

Key	Default	Meaning
`backendType`	`shell`	Registered PTY backend used for each Agent shell.
`timeoutMs`	`300000`	Wall-clock limit for one command; timeout closes the shell.
`maxOutputChars`	`16000`	Maximum retained command-output characters; fixed diagnostics are added afterward.
`description`	Persistent-shell description	Model-facing environment contract.

Model Experience

Tool schema

What the model sees

The generated bash schema, including the configured description. The plugin contributes no standalone system-prompt section; the deployment owns persona and environment guidance.

Token effect

Fixed schema cost while bash is visible.

KV Cache effect

Prefix-stable while the configured description and schema remain unchanged.

Tool results

What the model sees

Commands share one shell per Agent, so cwd, exported variables, activated environments, functions, and background jobs persist across calls. Results exclude private completion markers and the shell prompt. A nonzero wrapped command appends [exit code: N]; a shell that exits before reporting that status instead appends [shell exited: code N], [shell killed by signal: SIG], or [shell exited] when the backend supplies neither, then resets and tells the model that the next call starts fresh. Long output keeps the earliest retained prefix plus a clipping notice. If the PTY has already dropped that prefix, the result says so explicitly instead of presenting a tail as complete output. Timeout returns bounded partial output, closes the uncertain shell, and reports the reset.

Token effect

Data-dependent. maxOutputChars bounds retained command output; fixed clipping, lost-prefix, status, timeout, and reset diagnostics can extend the result.

KV Cache effect

Append-only tool results follow the reusable request prefix.

Known Limitations and Deferred Work

The tool requires an owning Agent and a real PTY backend.
Explicit exit and timeout discard shell state. Cancellation also resets and discards the result, even when a complete status marker is already observable; the next call starts a fresh shell.
Environment facts such as network access and package mirrors belong in the configured description, not this package's default.

LIMITATIONS

Known limitations

- The tool requires an owning Agent and a real PTY backend. - Explicit `exit` and timeout discard shell state. Cancellation also resets and discards the result, even when a complete status marker is already observable; the next call starts a fresh shell. - Environment facts such as network access and package mirrors belong in the configured `description`, not this package's default.