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SKILL.md

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

install eval-engineering
# install the langchain-skills pack with the skills CLI
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)

config/skills/eval-engineering/SKILL.md

MITFull file
1# Eval Engineering
2
3## Flow
4
5- Inspect all inputs first: the repository, Harness, optional traces, existing
6 Tasks and runs, existing World knowledge, and the human goal. Identify the
7 source files and skill references that apply before proposing work.
8- Create or update the small project World Knowledge Skill from reusable facts
9 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 exact
11 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 the
13 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 for
15 the next Task.
16
17## Terms
18
19- **Task Spec:** `Task.md`, which describes the input, relevant agent
20 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 reusable
28…

Excerpt shown under the repository's MIT license.

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