agentcore-harness-builder

79 / 100 · Review before installing

Check before installing. Some of what it can do is expected: a devops skill usually runs commands, installs tools and uses cloud credentials.

By timwukp/agent-skills-best-practice (GitHub) · devops · 13 stars · scanned at commit 0a67102

Build production-ready AWS Bedrock AgentCore Harness agents end to end — declarative model + prompt, managed/BYO Memory, built-in Browser, Code Interpreter, Web Search and Knowledge Bases (RAG), Gateway/MCP tools + rate limits, inline functions, Skills (incl. AWS catalog), versioning + endpoints, advanced config (truncation, limits, lifecycle, network, inbound auth, BYO S3 Files/EFS mounts or container), Observability (log delivery), Evaluations, Optimizations, Identity (outbound auth, Token Va…

Works with any agent that supports SKILL.md skills.

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What this skill can do

Connects to the internet

This is disclosed by the author in the skill's SKILL.md or README. Expected for a devops skill.

Found in 11 places.

skills/skills/agentcore-harness-builder/LIVE_VALIDATION.md, line 102| Web-search connector target (v1.2.0 + domainFilter) READY + live MCP `tools/list` returns `WebSearch` schema | PASS |
skills/skills/agentcore-harness-builder/LIVE_VALIDATION.md, line 1162. **Web-search connector hard requirements** (configurations non-empty `{"name": "WebSearch"}`,
skills/skills/agentcore-harness-builder/TEST_LOG.md, line 81- Command: gateway (AWS_IAM, MCP, SEMANTIC) → `create_gateway_target(targetConfiguration={"mcp":{"connector":{"source":{"connectorId":"web-search","version":"1.

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skills/skills/agentcore-harness-builder/TEST_LOG.md, line 82- Result: **PASS** — target READY; SigV4 `tools/list` against live gatewayUrl returned the `WebSearch` tool schema (query/maxResults/filters.domainFilter/filter
skills/skills/agentcore-harness-builder/TEST_LOG.md, line 83- HARD REQUIREMENTS (verified): `configurations` must be non-null AND non-empty — the entry is `{"name": "WebSearch", "parameterValues": {...}}` ("Connector con
skills/skills/agentcore-harness-builder/references/gateway.md, line 222"enabled": ["WebSearch"], # optional list (1..50) — restrict which tools this target exposes
skills/skills/agentcore-harness-builder/references/gateway.md, line 223"configurations": [{"name": "WebSearch", "parameterValues": { # name pattern [a-zA-Z][a-zA-Z0-9_-]*, <=64
skills/skills/agentcore-harness-builder/references/gateway.md, line 236*is* the connector's tool name (`WebSearch`; `Retrieve` / `AgenticRetrieveStream` for Knowledge Bases).
skills/skills/agentcore-harness-builder/references/gateway.md, line 256| `web-search` | `mcp.connector` | `WebSearch` (GA 2026-06-16, us-east-1; zero egress, no external provider or API key) |
skills/skills/agentcore-harness-builder/references/gateway.md, line 286The agent then sees a `WebSearch` MCP tool (`query`, `maxResults` 1–25, and on v1.2.0+ per-request
skills/skills/agentcore-harness-builder/references/gotchas.md, line 269- **Web-search connector target**: `configurations=[{"name": "WebSearch", "parameterValues": {...}}]`

Downloads and installs other software

The author does not mention this. Expected for a devops skill.

Found in 11 places.

skills/skills/agentcore-harness-builder/SKILL.md, line 32The agent-side SDK (`pip install bedrock-agentcore`) is a *third* thing: it's the library that runs **inside** a custom
skills/skills/agentcore-harness-builder/TEST_LOG.md, line 219- Command: `t1_4.py` — throwaway venv per version, `pip install botocore==X`, introspect, delete
skills/skills/agentcore-harness-builder/references/decision-guide.md, line 61Runtime path uses the agent-side SDK (`pip install bedrock-agentcore`): `BedrockAgentCoreApp`, `@app.entrypoint`,

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skills/skills/agentcore-harness-builder/references/gateway.md, line 594npm install -g @aws/agentcore # v0.26.x at time of writing; try @preview for newest commands
skills/skills/agentcore-harness-builder/references/gotchas.md, line 37pip3 install --upgrade boto3 botocore
skills/skills/agentcore-harness-builder/references/integrations.md, line 64npm i -g @aws/agentcore
skills/skills/agentcore-harness-builder/references/runtime.md, line 53The agent-side SDK is `pip install bedrock-agentcore`. The minimal app is:
skills/skills/agentcore-harness-builder/references/runtime.md, line 155Install protocol extras: `pip install "bedrock-agentcore[ag-ui]"` or `"bedrock-agentcore[a2a]"`.
skills/skills/agentcore-harness-builder/references/runtime.md, line 200npm i -g @aws/agentcore
skills/skills/agentcore-harness-builder/references/runtime.md, line 306is **ignored** — there is no server-side `pip install`. If your agent imports anything third-party
skills/skills/agentcore-harness-builder/references/runtime.md, line 311uv pip install --python-platform aarch64-manylinux2014 --python-version 3.13 \

Runs commands on your computer

This is disclosed by the author in the skill's SKILL.md or README. Expected for a devops skill.

Found in 6 places.

skills/skills/agentcore-harness-builder/SKILL.md, line 68python scripts/preflight.py --region us-east-1
skills/skills/agentcore-harness-builder/SKILL.md, line 100python scripts/create_harness.py --config harness.json --role-arn <EXECUTION_ROLE_ARN>
skills/skills/agentcore-harness-builder/SKILL.md, line 121python scripts/wire_memory.py --harness-id <ID> --role-arn <EXECUTION_ROLE_ARN> \

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skills/skills/agentcore-harness-builder/SKILL.md, line 133python scripts/setup_observability.py --harness-id <ID> --region us-east-1 \
skills/skills/agentcore-harness-builder/SKILL.md, line 148python scripts/invoke_harness.py --harness-arn <HARNESS_ARN> --prompt "Hello, what can you do?"
skills/skills/agentcore-harness-builder/SKILL.md, line 164python scripts/invoke_harness.py --harness-arn <ARN> --qualifier prod --prompt "..."

Safer alternatives

Low-risk skills in the same category (devops) that look related. Check that one does what you need.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'agentcore-harness-builder' ] || [ -L ~/.agents/skills/'agentcore-harness-builder' ]; then echo 'A skill folder named agentcore-harness-builder already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/timwukp/agent-skills-best-practice' "$d" && git -C "$d" checkout --quiet '0a67102a22e6958154baf632b9ac4eeec7f1fa9c' -- 'skills/skills/agentcore-harness-builder' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/skills/agentcore-harness-builder' ~/.agents/skills/'agentcore-harness-builder' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'agentcore-harness-builder' ~/.claude/skills/'agentcore-harness-builder' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history

Date	Version	Score
2026-11-08	`0a67102`	79