feat: add YNAB_READ_ONLY mode that hides mutating tools - #20
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With YNAB_READ_ONLY=true, write_tool() skips registration for all 16 create/update/delete/import tools, so clients only see read and analytics tools. Guards against prompt-injection-driven mutations from untrusted text (payee names, memos) reaching a model that also holds write access. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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With YNAB_READ_ONLY=true, write_tool() skips registration for all 16 create/update/delete/import tools, so clients only see read and analytics tools. Guards against prompt-injection-driven mutations from untrusted text (payee names, memos) reaching a model that also holds write access.