hive.writing-hive-skills— agent skill

Operational Protocol: Writing Hive Skills

Hive agents discover skills by scanning several roots, in precedence order:

1. <project>/.hive/skills/ — project, Hive-specific
2. <project>/.agents/skills/ — project, cross-client
3. ~/.hive/skills/ — user, Hive-specific
4. ~/.agents/skills/ — user, cross-client
5. Framework defaults shipped in core/framework/skills/_default_skills/

Each skill is a directory containing a SKILL.md. At startup, only the frontmatter name + description of every skill is loaded; the body is loaded only when the agent activates the skill. Design for that.

Choosing where to put a new skill

• Colony-scoped (via `create_colony`): when the skill is the operational protocol a single colony needs — its API auth, DOM selectors, DB schema, task-queue conventions — do NOT place it under ~/.hive/skills/ or <project>/.hive/skills/ yourself. Those roots are SHARED and every colony on the machine will see it. Instead, pass the skill content INLINE to the create_colony tool (skill_name, skill_description, skill_body, optional skill_files). The tool materializes the folder under ~/.hive/colonies/<colony_name>/.hive/skills/<skill-name>/ where it is discovered as project scope by only that colony's workers. See the subsection below.
• Project-scoped: put under <project>/.hive/skills/ when the skill is tied to that codebase's APIs, conventions, or infra and multiple agents in the project should share it.
• User-scoped: put under ~/.hive/skills/ when the skill is reusable across projects for this machine/user and all agents should see it.
• Framework default: add under core/framework/skills/_default_skills/ AND register in framework/skills/defaults.py::SKILL_REGISTRY only when the skill is a universal operational protocol shipped with Hive. Default skills use the hive.<name> naming convention and include type: default-skill in metadata.

Colony-scoped skills via create_colony

A colony-scoped skill is one that belongs to exactly ONE colony — e.g. it encodes the HoneyComb staging API the honeycomb_research colony polls, or the LinkedIn outbound flow the linkedin_outbound_campaign colony runs. Writing such a skill at ~/.hive/skills/ or <project>/.hive/skills/ leaks it to every other colony, which will then see it at selection time.

Do not reach for `write_file` to create the folder. The create_colony tool takes the skill content INLINE and places it for you:

create_colony(
    colony_name="honeycomb_research",
    task="Build a daily honeycomb market report…",
    skill_name="honeycomb-api-protocol",
    skill_description="How to query the HoneyComb staging API…",
    skill_body="## Operational Protocol\n\nAuth: …",
    skill_files=[{"path": "scripts/fetch_tickers.py", "content": "…"}],  # optional
)

The tool writes ~/.hive/colonies/honeycomb_research/.hive/skills/honeycomb-api-protocol/SKILL.md (plus any skill_files), which SkillDiscovery picks up as project scope when that colony's workers start — and ONLY that colony's workers. No cross-colony leakage.

Do not write colony-bound skill folders by hand under ~/.hive/skills/. A skill placed there is user-scoped and becomes visible to every colony on the machine — defeating the isolation you wanted.

Directory layout

<skill-name>/
├── SKILL.md          # Required
├── scripts/          # Optional — executable helpers
├── references/       # Optional — on-demand docs
└── assets/           # Optional — templates, data, images

Rules:

• The directory name must equal the name frontmatter field (for framework defaults, the directory is the unprefixed name, e.g. note-taking/ for hive.note-taking).
• Keep SKILL.md under ~500 lines. Move long reference material into references/.
• Reference other files with relative paths from the skill root (scripts/foo.py, references/API.md). Keep references one level deep.

SKILL.md frontmatter

Required fields:

Optional fields:

Minimal template:

---
name: my-skill
description: One sentence on what it does. One sentence on when to use it, with concrete trigger words the agent will see in user requests.
---

# My Skill

<body>

Writing a good description

This is the single most important field — it's the only thing the agent sees at skill-selection time.

• Bad: Helps with trading.
• Good: Buy and sell shares on the HoneyComb exchange. Handles auth, slippage-protected orders, idempotent retries, and AMM output estimation. Use when placing trades or interacting with the AMM.

Include verbs the user is likely to say (buy, sell, place trade) and proper nouns (HoneyComb, AMM).

Writing the body

Structure the body for the agent, not a human reader:

1. Lead with what the agent can't guess — API base URLs, auth shape, project conventions, specific function names. Skip generic background ("PDFs are a document format").
2. Show exact request/response shapes — include JSON payloads, headers, status codes. Copy real examples rather than paraphrasing.
3. Document failure modes — error codes, retry rules, rate limits. This is where skills earn their keep vs. a generic agent.
4. Give a short end-to-end example — a "typical flow" section at the bottom anchors everything above.

Recommended sections (adapt to the domain):

• Authentication / setup
• Core operations (one per endpoint or action)
• Error reference table
• Rate limits / gotchas
• End-to-end example pattern

Progressive disclosure

Three tiers of context cost:

1. Always loaded (~100 tokens per skill): name + description. Keep tight.
2. Loaded on activation (<5k tokens target): body of SKILL.md.
3. Loaded on demand: files under scripts/, references/, assets/. The agent reads these only when the body points to them.

If a section is long and only needed sometimes (e.g., a full schema dump, rarely-used edge cases), move it to references/SOMETHING.md and link to it from the body: See [the error catalog](references/ERRORS.md) for the full list.

Scripts

Put executable helpers in scripts/. They should:

• Be self-contained or document dependencies in a comment header.
• Print human-readable errors to stderr and exit non-zero on failure.
• Accept arguments via CLI flags, not env vars (easier for the agent to invoke).

Reference them from the body by relative path:

Estimate buy output with `scripts/estimate_buy.py --v-hc 1000000 --v-shares 1000000 --hc 500`.

For Python scripts in a Hive project, prefer uv run scripts/foo.py ....

Creating a new skill — workflow

1. Pick a <skill-name> (lowercase-hyphenated).
2. Decide scope: colony (pass content INLINE to create_colony — STOP here, do not hand-author the folder), project (<project>/.hive/skills/), user (~/.hive/skills/), or framework default (core/framework/skills/_default_skills/ + registry entry).
3. For the non-colony scopes: create the directory and write SKILL.md with frontmatter + body.
4. Add scripts/, references/, assets/ only if needed.
5. Validate the frontmatter: name matches dir, description is specific, no forbidden characters.
6. Validate using the Hive CLI:

   uv run hive skill validate <path-to-skill-dir>
   uv run hive skill doctor

1. Confirm discovery with uv run hive skill list.
2. Test by invoking a Hive agent on a task the skill should match — confirm it activates and follows the instructions.

Registering as a framework default

When adding a skill as a shipped default:

1. Place the directory under core/framework/skills/_default_skills/<unprefixed-name>/.
2. Set frontmatter name: hive.<unprefixed-name> and metadata.type: default-skill.
3. Add the mapping to SKILL_REGISTRY in core/framework/skills/defaults.py:

   SKILL_REGISTRY: dict[str, str] = {
       ...
       "hive.<unprefixed-name>": "<unprefixed-name>",
   }

1. If the skill uses {{placeholder}} substitution, add defaults to _SKILL_DEFAULTS in the same file.
2. If the skill reads/writes shared buffer keys, list them in DATA_BUFFER_KEYS.

What NOT to put in a skill

• Generic programming knowledge the agent already has.
• Conversation-specific state (use memory or plans instead).
• Secrets or credentials (skills are plaintext; reference env vars or credential stores).
• Deeply nested reference chains — keep everything one hop from SKILL.md.