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nix-agent-configs

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Actualizado3 de julio de 2026 a las 16:59

Hard-won lessons for working on the Nix-managed AI agent configs in modules/home-manager/ai/ (the Bedrock-backed agents pi, claude, maki, hermes, codex, plus kiro-cli, and the LiteLLM proxy). Use this skill ONLY when editing files under modules/home-manager/ai/ or debugging agent auth/telemetry/model routing. Covers: telemetry-off enforcement, thinking-effort ceilings, the two Bedrock auth paths (bearer vs SigV4), model-reachability verification, patching pipx/venv tools, and the CI expectations for this repo. Triggers on: editing modules/home-manager/ai, "LiteLLM proxy", "Bedrock auth", "agent telemetry", "thinking effort", "kiro-cli config".

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gburd

gburd/nix-config

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SKILL.md

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name

nix-agent-configs

description

Lessons: Nix-managed AI Agent Configs

When working on modules/home-manager/ai/ (Bedrock-backed agents: pi, claude, maki, hermes, codex; plus kiro-cli):

Telemetry ships ON by default. Disable it declaratively, don't assume: kiro-cli (telemetry.enabled = false in ~/.kiro/settings/cli.json), Claude Code (CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=true + DISABLE_TELEMETRY/ERROR_REPORTING/BUG_COMMAND), pi (enableInstallTelemetry=false and PI_TELEMETRY=0). For tools whose state file is mutable, enforce via a home.activation jq patch (create-if-missing).
"Ultra" thinking == pi's xhigh (off/minimal/low/medium/high/xhigh). The env-var efforts (CLAUDE_THINKING_EFFORT, codex model_reasoning_effort, hermes reasoning_effort) top out at high — don't invent higher values.
Bedrock auth has two paths. The bearer token (AWS_BEARER_TOKEN_BEDROCK) works for InvokeModel/Converse and Bedrock's HTTPS endpoint accepts Authorization: Bearer <token> directly. The Anthropic SDK's AnthropicBedrock client is SigV4-only and fails with "could not resolve credentials from session" on a bearer-only host. kiro-cli does not use Bedrock at all — it authenticates with its own subscription/credits.
Unset leaked AWS_PROFILE. botocore prefers AWS_PROFILE over the bearer token; a stale/undefined profile leaked from the login session makes every Bedrock call 500 with ProfileNotFound. The LiteLLM start script unsets AWS_PROFILE/static creds so the bearer token is the sole auth path.
Verify model reachability before claiming it works. A direct InvokeModel probe (or curl to /model/<id>/invoke) proving HTTP 200 does not prove a given agent's code path works — agents route through different SDKs.
Patching pipx/venv tools: ship an idempotent Python patcher in-repo and run it from home.activation after the pipx install/upgrade (pipx upgrade can overwrite the venv). Guard with a sentinel marker, and locate code by parsing (e.g. balance parens to find a signature end) rather than matching exact lines, so the patch survives upstream version drift. Wrap the agent binary in a writeShellScriptBin shim that exports the bearer token, mirroring pi/maki.
Flakes only see git-tracked files. A new file referenced by a module won't build until git add-ed.

CI Expectations (this repo)

deadnix --fail . and statix check . are blocking in the Lint workflow — no unused bindings/args (prefix intentionally-unused lambda args with _). nix fmt -- --check . (nix-formatter-pack) is what CI's Lint job runs — run it locally before pushing.
Tag-only workflows must skip gracefully when a referenced flake attribute doesn't exist (e.g. the ISO build checks nix eval ...drvPath first), so a missing optional output never fails a release.

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name

nix-agent-configs

description

Lessons: Nix-managed AI Agent Configs

When working on modules/home-manager/ai/ (Bedrock-backed agents: pi, claude, maki, hermes, codex; plus kiro-cli):

Telemetry ships ON by default. Disable it declaratively, don't assume: kiro-cli (telemetry.enabled = false in ~/.kiro/settings/cli.json), Claude Code (CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC=true + DISABLE_TELEMETRY/ERROR_REPORTING/BUG_COMMAND), pi (enableInstallTelemetry=false and PI_TELEMETRY=0). For tools whose state file is mutable, enforce via a home.activation jq patch (create-if-missing).
"Ultra" thinking == pi's xhigh (off/minimal/low/medium/high/xhigh). The env-var efforts (CLAUDE_THINKING_EFFORT, codex model_reasoning_effort, hermes reasoning_effort) top out at high — don't invent higher values.
Bedrock auth has two paths. The bearer token (AWS_BEARER_TOKEN_BEDROCK) works for InvokeModel/Converse and Bedrock's HTTPS endpoint accepts Authorization: Bearer <token> directly. The Anthropic SDK's AnthropicBedrock client is SigV4-only and fails with "could not resolve credentials from session" on a bearer-only host. kiro-cli does not use Bedrock at all — it authenticates with its own subscription/credits.
Unset leaked AWS_PROFILE. botocore prefers AWS_PROFILE over the bearer token; a stale/undefined profile leaked from the login session makes every Bedrock call 500 with ProfileNotFound. The LiteLLM start script unsets AWS_PROFILE/static creds so the bearer token is the sole auth path.
Verify model reachability before claiming it works. A direct InvokeModel probe (or curl to /model/<id>/invoke) proving HTTP 200 does not prove a given agent's code path works — agents route through different SDKs.
Patching pipx/venv tools: ship an idempotent Python patcher in-repo and run it from home.activation after the pipx install/upgrade (pipx upgrade can overwrite the venv). Guard with a sentinel marker, and locate code by parsing (e.g. balance parens to find a signature end) rather than matching exact lines, so the patch survives upstream version drift. Wrap the agent binary in a writeShellScriptBin shim that exports the bearer token, mirroring pi/maki.
Flakes only see git-tracked files. A new file referenced by a module won't build until git add-ed.

CI Expectations (this repo)

deadnix --fail . and statix check . are blocking in the Lint workflow — no unused bindings/args (prefix intentionally-unused lambda args with _). nix fmt -- --check . (nix-formatter-pack) is what CI's Lint job runs — run it locally before pushing.
Tag-only workflows must skip gracefully when a referenced flake attribute doesn't exist (e.g. the ISO build checks nix eval ...drvPath first), so a missing optional output never fails a release.