shell tool description advertises hardcoded 2-minute default, even when OPENCODE_EXPERIMENTAL_BASH_DEFAULT_TIMEOUT_MS is set #25913

Summary

The shell tool's description text advertises a hardcoded 120000ms (2 minutes) default timeout to the model, regardless of the runtime value of DEFAULT_TIMEOUT (which respects OPENCODE_EXPERIMENTAL_BASH_DEFAULT_TIMEOUT_MS). This trains LLMs to override operator-configured defaults with their own (often shorter) explicit timeout values, causing premature SIGTERM on long-running commands.

Current behavior

In packages/opencode/src/tool/shell/prompt.ts, the per-shell description sections (bashCommandSection, powershellCommandSection, cmdCommandSection) each hardcode this line verbatim:

You can specify an optional timeout in milliseconds. If not specified, commands will time out after 120000ms (2 minutes).

Meanwhile, the actual runtime default is computed at packages/opencode/src/tool/shell.ts:29:

const DEFAULT_TIMEOUT = Flag.OPENCODE_EXPERIMENTAL_BASH_DEFAULT_TIMEOUT_MS || 2 * 60 * 1000

When an operator sets e.g. OPENCODE_EXPERIMENTAL_BASH_DEFAULT_TIMEOUT_MS=7200000 (2 hours), the model still reads "2 minutes" in its tool description and frequently emits explicit timeout values clustered around its mental model of "2 minutes" — defeating the operator's intent. Combined with the params.timeout ?? DEFAULT_TIMEOUT fallback at shell.ts:603, any LLM-supplied value wins.

Expected behavior

The advertised default in the tool description should reflect the actual runtime DEFAULT_TIMEOUT value, so the model is told the truth about how long it has before SIGTERM.

Suggested fix

shell.ts:588 already calls ShellPrompt.render(name, process.platform, limits), where limits: Limits is plumbed through to the command-section helpers. Two small mechanical changes close the gap:

1. Extend the Limits type in prompt.ts to include defaultTimeoutMs: number (or pass DEFAULT_TIMEOUT as a separate fourth argument to render).
2. Replace the hardcoded 120000ms (2 minutes) literal in bashCommandSection, powershellCommandSection, and cmdCommandSection with ${limits.defaultTimeoutMs}ms (or a similar interpolation that reflects the actual configured value).

A PR will follow.

Environment

• Affected files: packages/opencode/src/tool/shell/prompt.ts (three call sites), packages/opencode/src/tool/shell.ts:29,588,603
• Reproducible on: latest dev