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feat(coding-agent): add --no-tools flag to disable built-in tools

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Add --no-tools flag that allows starting pi without any built-in tools,
enabling extension-only tool setups (e.g., pi-ssh-remote).

- Add --no-tools flag to CLI args parsing
- Handle --tools '' (empty string) as equivalent to no tools
- Fix system prompt to not show READ-ONLY mode when no tools (extensions may provide write capabilities)
- Add tests for new flag and system prompt behavior

fixes #555
This commit is contained in:
Carlos Villela 2026-01-07 23:10:58 -08:00
parent cfa63c255d
commit 8f5523ed56
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6 changed files with 123 additions and 15 deletions
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11
packages/coding-agent/src/core/system-prompt.ts
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@ -209,7 +209,7 @@ export function buildSystemPrompt(options: BuildSystemPromptOptions = {}): strin
// Build tools list based on selected tools
const tools = selectedTools || (["read", "bash", "edit", "write"] as ToolName[]);
const toolsList = tools.map((t) => `- ${t}: ${toolDescriptions[t]}`).join("\n");
const toolsList = tools.length > 0 ? tools.map((t) => `- ${t}: ${toolDescriptions[t]}`).join("\n") : "(none)";
// Build guidelines based on which tools are actually available
const guidelinesList: string[] = [];
@ -222,8 +222,9 @@ export function buildSystemPrompt(options: BuildSystemPromptOptions = {}): strin
const hasLs = tools.includes("ls");
const hasRead = tools.includes("read");
// Read-only mode notice (no bash, edit, or write)
if (!hasBash && !hasEdit && !hasWrite) {
// Read-only mode notice (only if we have some read-only tools but no write tools)
// Skip this if there are no built-in tools at all (extensions may provide write capabilities)
if (tools.length > 0 && !hasBash && !hasEdit && !hasWrite) {
guidelinesList.push("You are in READ-ONLY mode - you cannot modify files or execute arbitrary commands");
}
@ -265,7 +266,9 @@ export function buildSystemPrompt(options: BuildSystemPromptOptions = {}): strin
// Always include these
guidelinesList.push("Be concise in your responses");
guidelinesList.push("Show file paths clearly when working with files");
if (tools.length > 0) {
guidelinesList.push("Show file paths clearly when working with files");
}
const guidelines = guidelinesList.map((g) => `- ${g}`).join("\n");