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# Plugin-scope agent-author omits `tools:` and all Claude-only fields from `.apm/agents/*.agent.md`
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This ADR is a narrower, downstream consequence discovered while designing issue #89's
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implementation under ADR-0015's broader direction (Microsoft APM replaces hand-authored
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plugin/marketplace authoring). It does not restate ADR-0015's rationale — see that ADR for
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the parent decision.
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## Context
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APM's agent primitive (`.apm/agents/<name>.agent.md`) has no per-target integrator in
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`apm compile` — confirmed via APM's own Python source (`integration/targets.py` and related
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files, cited in `plugins/kyberforge/docs/research/docs/microsoft-apm/agent-primitive-schema.md`).
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Compilation does a naive verbatim copy of the whole frontmatter and body to both the Claude
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Code and Copilot CLI targets. This is unlike:
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- The **skill** primitive, which is also a straight copy (confirmed in the same research doc)
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but has no field semantics to conflict — `SKILL.md`'s content is target-agnostic already.
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- The **prompt**, **instructions**, and **hooks** primitives, which each get real per-target
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reconstruction through a dedicated integrator (field allowlisting, key renaming, dropped-field
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warnings).
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Because the agent primitive ships the same frontmatter unchanged to both harnesses, two
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concrete incompatibilities surface:
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1. **`tools:`** — Claude Code expects a space-separated tool-name string; Copilot CLI expects a
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list drawn from its own alias vocabulary (`execute`/`read`/`edit`/`search`/`agent`/`web`). A
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value correct for one harness is wrong for the other.
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2. **Claude-only knobs with no Copilot equivalent** — `isolation`, `maxTurns`, `effort`,
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`memory`, `permissionMode`. Writing any of these means Copilot's copy carries frontmatter
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keys it doesn't recognize at all. Whether Copilot's agent loader ignores unknown keys or
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errors on them is unconfirmed by research.
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## Decision
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At **plugin scope only** (destination package has an `apm.yml` at its root — an APM producer
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package compiled via `apm compile`), `.apm/agents/<name>.agent.md` carries only `name`,
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`description`, `model`, and the prose body. No `tools:` field, no Claude-only fields, at all.
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Absent `tools:` means inherit-all-tools on both harnesses — the one value that is never wrong
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on either target, unlike a present, harness-specific value that is guaranteed wrong on at least
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one of them.
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`agent-audit`, at plugin scope, flags — as a **SUGGESTION**, not a FAIL, since this is an
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upstream schema limitation rather than an authoring mistake — any agent whose description or
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body implies a need for tool restriction or a Claude-only behavior the frontmatter can no
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longer express. This gives visibility into the gap without pretending the schema can do
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something it can't.
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### Scope boundary
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This decision applies to **plugin-scope `agent-author` only**. Project scope (`.claude/agents/`
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+ `.github/agents/`) and user scope (`~/.claude/agents/` + `~/.copilot/agents/`) are not APM
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packages — neither goes through `apm compile` — so both keep today's dual-file Claude+Copilot
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pair model exactly as ADR-0005 and ADR-0008 already describe. Those two ADRs remain fully
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authoritative for project and user scope; only their plugin-scope clauses are affected by this
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ADR (see the update notes appended to each).
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## Considered options
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**Pick one harness's vocabulary and accept breakage on the other (rejected).** E.g. always
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write Claude's space-separated `tools:` string. Rejected because it ships a value that is
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silently wrong (or possibly a hard error) on Copilot, and which harness "wins" would be an
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arbitrary, undocumented asymmetry.
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**Same as above, but `agent-audit` flags the cross-harness breakage as a tracked finding
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(rejected).** Rejected for the same core reason — it still ships a wrong value to a real
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harness. Tracking the breakage doesn't prevent it, and the chosen decision already gets
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equivalent visibility (a SUGGESTION finding) without ever shipping the wrong value in the first
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place.
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## Consequences
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- Every plugin-scope APM agent loses per-agent tool restriction and any Claude-only capability
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(isolation, maxTurns, effort, memory, permissionMode) until APM ships a real per-target
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integrator for the agent primitive. This is a known, accepted regression, not an oversight.
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- **ADR-0005 is partially superseded** — its plugin-scope clause ("directory containing
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`plugin.json` is plugin scope → both files land in `<root>/agents/`") no longer applies.
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Plugin scope is now "directory containing `apm.yml` → single vendor-neutral file lands in
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`<root>/.apm/agents/`." Project and user scope, and the rest of ADR-0005, are unaffected.
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- **ADR-0008 is partially superseded** — its counterpart-derivation/pair-validation mechanism
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no longer applies at plugin scope; `agent-audit` takes the single file directly there. Project
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and user scope, where a real pair still exists, are unaffected.
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- **ADR-0009 is not superseded.** The mechanism it established — `agent-audit` reading field
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lists from `references/field-inventory.md` rather than hardcoding them, with a `source_keys`
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provenance chain — survives and is reused. Only the *content shape* changes for plugin scope:
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`field-inventory.md` shifts from two side-by-side CC-only/Copilot-only blocklists to one
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vendor-neutral allowlist (`name`/`description`/`model`) for plugin-scope agents, while
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continuing to serve its original two-blocklist role for project/user-scope validation.
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