Skills for Real Engineers. Straight from my .agents directory.
eval-engineering
Agent skill fromlangchain-ai/langchain-skills
Inspect an agent repository and optional traces, interview the user, write reviewed Task Specs, build and audit Harbor tasks, and bootstrap reusable project World Knowledge Skills. Use for agent evals, benchmark design, Task generation, controlled Environments, synthetic data, Verifiers, Harbor runs, calibration, or continuous benchmark maintenance.
How to install eval-engineering
npx skills add langchain-ai/langchain-skills# or add only this skill to Claude Code: copy the folder
config/skills/eval-engineering/
# into
~/.claude/skills/eval-engineering/ (all projects)
.claude/skills/eval-engineering/ (one project)
1# Eval Engineering23## Flow45- Inspect all inputs first: the repository, Harness, optional traces, existing6 Tasks and runs, existing World knowledge, and the human goal. Identify the7 source files and skill references that apply before proposing work.8- Create or update the small project World Knowledge Skill from reusable facts9 in those inputs. Use it to propose one grounded Task.10- Draft the Task Spec and World Skill together. Show both to the user, keep exact11 Task truth only in `Task.md`, and refine both until the user approves them.12- Implement the approved Task, validate its Environment and Verifier, run the13 real Harness, inspect the full evidence, and fix only non-agent failures.14- Reconcile the World Skill with what the run proved, then repeat this flow for15 the next Task.1617## Terms1819- **Task Spec:** `Task.md`, which describes the input, relevant agent20 conditions, Environment, scoring, fairness, and open decisions for one Task.21- **Task:** the runnable instruction, Environment, and Verifier.22- **Harness:** the complete agent Harbor runs, including prompts, model loop,23 tools, hooks, memory, sessions, and adapter.24- **Environment:** the files, data, services, identity, permissions, network,25 clock, and mutable state around the Harness.26- **Verifier:** independent checks that score the result or mark a run invalid.27- **World Knowledge Skill:** a repository-local skill with reusable28…
Excerpt shown under the repository's MIT license.
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