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Skillscript — What's New

Pragmatic, task-oriented notes on each release: what changed, why you'd care, and how to use it. This is the friendly companion to the CHANGELOG — the CHANGELOG is the terse authoritative record (every change + its upgrade impact); these pages are the "here's the feature, here's how you'd actually use it" walkthrough.

If you're deciding whether a release matters to you, start here. If you need the exact list of what changed, read the CHANGELOG.

Release notes

Newest first. Each page covers the problem a release solves, the few things you can now do, a copy-paste example, and the gotchas.

0.40.1 — |fallback: works wherever you put it, and the reference is current again — putting |fallback:after another filter suppressed 0.40.0's raise without supplying the fallback value; fixed, along with in's left-hand side and the empty-value predicate. Also: the language reference shipped in the package had been stale since July and is regenerated — if you wrote a not in de-duplication check against it, re-read that section.
0.40.0 — A condition that can't read a field now says so — an unresolved reference inside an if used to evaluate as false, so "the field is missing" and "the field says no" were the same answer; it now raises. Note the direction: not and != conditions used to run their branch on an unreadable field. BREAKING only where a field is genuinely absent at runtime.
0.39.4 — Assigning a list of records no longer breaks it — $set ITEMS = ${records} used to shred a list of objects into text fragments, so a later foreach couldn't read any field; objects were mangled the same way. BREAKING only for bare numeric # Vars: lists, which now hold numbers instead of text.
0.39.3 — "Couldn't tell" no longer means "no" — a store outage stops reading as a negative answer: skillfile delete fails closed (and now detects the $ execute_skill name="…" reference form it used to miss), and composition / lint / promote report "store unreachable" instead of "not found" / "typo" / "no valid signature".
0.39.2 — A silently truncated argument, fixed — a $ dispatch value containing a double-quote (or unquoted whitespace) no longer silently truncates the argument; kwargs are parsed before substitution.
0.39.1 — HTTP MCP connectors recover from a bad moment — a transient network blip during a connector's handshake no longer wedges it until a runtime restart; it recovers on the next call.
0.39.0 — # OnError: is gone (and it never worked) — the inert error-handler header is removed; a skill carrying it now fails to compile with a pointer to else: / (fallback:). BREAKING only if you used it.
0.38.0 — Line-slicing and field-projection filters — tail/head/lines to slice a log without a shell binary; pluck to project a field from a list of records for clean dedup.
0.37.0 — Bounding external work: the right lever — per-leg timeout= + (fallback:) for a partial-tolerant gather, vs. the whole-run # Deadline: cap.
0.36.0 — Autonomous-fire failure supervision — a cron/event run fails; the runtime pushes it to a handler skill instead of leaving it in a trace nobody reads.
0.35.0 — Deadlines & cancellation — bound a whole run in wall-clock time; real cancellation, not race-and-abandon.
0.34.0 — REST-backed connectors + secret hardening — a plain REST API is a first-class connector (no MCP server needed); shell ops no longer leak secrets into child processes.

Feature guides

Deeper how-tos for individual capabilities, independent of the release they shipped in.

Tagging skills (# Tags:) — organize and find skills; group a big skill menu into families.

Where else to look

Language reference — the canonical spec (syntax, ops, semantics): docs/language-reference.md
Adopter playbook — wiring substrates, security boundaries, running as a service: docs/adopter-playbook.md
help({topic}) — the language surface, reachable from your agent over MCP (ops, frontmatter, connectors, lint-codes, error-handling).

Skillscript — What's New

Pragmatic, task-oriented notes on each release: what changed, why you'd care, and how to use it. This is the friendly companion to the CHANGELOG — the CHANGELOG is the terse authoritative record (every change + its upgrade impact); these pages are the "here's the feature, here's how you'd actually use it" walkthrough.

If you're deciding whether a release matters to you, start here. If you need the exact list of what changed, read the CHANGELOG.

Release notes

Newest first. Each page covers the problem a release solves, the few things you can now do, a copy-paste example, and the gotchas.

0.40.1 — |fallback: works wherever you put it, and the reference is current again — putting |fallback:after another filter suppressed 0.40.0's raise without supplying the fallback value; fixed, along with in's left-hand side and the empty-value predicate. Also: the language reference shipped in the package had been stale since July and is regenerated — if you wrote a not in de-duplication check against it, re-read that section.
0.40.0 — A condition that can't read a field now says so — an unresolved reference inside an if used to evaluate as false, so "the field is missing" and "the field says no" were the same answer; it now raises. Note the direction: not and != conditions used to run their branch on an unreadable field. BREAKING only where a field is genuinely absent at runtime.
0.39.4 — Assigning a list of records no longer breaks it — $set ITEMS = ${records} used to shred a list of objects into text fragments, so a later foreach couldn't read any field; objects were mangled the same way. BREAKING only for bare numeric # Vars: lists, which now hold numbers instead of text.
0.39.3 — "Couldn't tell" no longer means "no" — a store outage stops reading as a negative answer: skillfile delete fails closed (and now detects the $ execute_skill name="…" reference form it used to miss), and composition / lint / promote report "store unreachable" instead of "not found" / "typo" / "no valid signature".
0.39.2 — A silently truncated argument, fixed — a $ dispatch value containing a double-quote (or unquoted whitespace) no longer silently truncates the argument; kwargs are parsed before substitution.
0.39.1 — HTTP MCP connectors recover from a bad moment — a transient network blip during a connector's handshake no longer wedges it until a runtime restart; it recovers on the next call.
0.39.0 — # OnError: is gone (and it never worked) — the inert error-handler header is removed; a skill carrying it now fails to compile with a pointer to else: / (fallback:). BREAKING only if you used it.
0.38.0 — Line-slicing and field-projection filters — tail/head/lines to slice a log without a shell binary; pluck to project a field from a list of records for clean dedup.
0.37.0 — Bounding external work: the right lever — per-leg timeout= + (fallback:) for a partial-tolerant gather, vs. the whole-run # Deadline: cap.
0.36.0 — Autonomous-fire failure supervision — a cron/event run fails; the runtime pushes it to a handler skill instead of leaving it in a trace nobody reads.
0.35.0 — Deadlines & cancellation — bound a whole run in wall-clock time; real cancellation, not race-and-abandon.
0.34.0 — REST-backed connectors + secret hardening — a plain REST API is a first-class connector (no MCP server needed); shell ops no longer leak secrets into child processes.

Feature guides

Deeper how-tos for individual capabilities, independent of the release they shipped in.

Tagging skills (# Tags:) — organize and find skills; group a big skill menu into families.

Where else to look

Language reference — the canonical spec (syntax, ops, semantics): docs/language-reference.md
Adopter playbook — wiring substrates, security boundaries, running as a service: docs/adopter-playbook.md
help({topic}) — the language surface, reachable from your agent over MCP (ops, frontmatter, connectors, lint-codes, error-handling).

Skillscript — What's New

Pragmatic, task-oriented notes on each release: what changed, why you'd care, and how to use it. This is the friendly companion to the CHANGELOG — the CHANGELOG is the terse authoritative record (every change + its upgrade impact); these pages are the "here's the feature, here's how you'd actually use it" walkthrough.

If you're deciding whether a release matters to you, start here. If you need the exact list of what changed, read the CHANGELOG.

Release notes

Newest first. Each page covers the problem a release solves, the few things you can now do, a copy-paste example, and the gotchas.

0.40.1 — |fallback: works wherever you put it, and the reference is current again — putting |fallback:after another filter suppressed 0.40.0's raise without supplying the fallback value; fixed, along with in's left-hand side and the empty-value predicate. Also: the language reference shipped in the package had been stale since July and is regenerated — if you wrote a not in de-duplication check against it, re-read that section.
0.40.0 — A condition that can't read a field now says so — an unresolved reference inside an if used to evaluate as false, so "the field is missing" and "the field says no" were the same answer; it now raises. Note the direction: not and != conditions used to run their branch on an unreadable field. BREAKING only where a field is genuinely absent at runtime.
0.39.4 — Assigning a list of records no longer breaks it — $set ITEMS = ${records} used to shred a list of objects into text fragments, so a later foreach couldn't read any field; objects were mangled the same way. BREAKING only for bare numeric # Vars: lists, which now hold numbers instead of text.
0.39.3 — "Couldn't tell" no longer means "no" — a store outage stops reading as a negative answer: skillfile delete fails closed (and now detects the $ execute_skill name="…" reference form it used to miss), and composition / lint / promote report "store unreachable" instead of "not found" / "typo" / "no valid signature".
0.39.2 — A silently truncated argument, fixed — a $ dispatch value containing a double-quote (or unquoted whitespace) no longer silently truncates the argument; kwargs are parsed before substitution.
0.39.1 — HTTP MCP connectors recover from a bad moment — a transient network blip during a connector's handshake no longer wedges it until a runtime restart; it recovers on the next call.
0.39.0 — # OnError: is gone (and it never worked) — the inert error-handler header is removed; a skill carrying it now fails to compile with a pointer to else: / (fallback:). BREAKING only if you used it.
0.38.0 — Line-slicing and field-projection filters — tail/head/lines to slice a log without a shell binary; pluck to project a field from a list of records for clean dedup.
0.37.0 — Bounding external work: the right lever — per-leg timeout= + (fallback:) for a partial-tolerant gather, vs. the whole-run # Deadline: cap.
0.36.0 — Autonomous-fire failure supervision — a cron/event run fails; the runtime pushes it to a handler skill instead of leaving it in a trace nobody reads.
0.35.0 — Deadlines & cancellation — bound a whole run in wall-clock time; real cancellation, not race-and-abandon.
0.34.0 — REST-backed connectors + secret hardening — a plain REST API is a first-class connector (no MCP server needed); shell ops no longer leak secrets into child processes.

Feature guides

Deeper how-tos for individual capabilities, independent of the release they shipped in.

Tagging skills (# Tags:) — organize and find skills; group a big skill menu into families.

Where else to look

Language reference — the canonical spec (syntax, ops, semantics): docs/language-reference.md
Adopter playbook — wiring substrates, security boundaries, running as a service: docs/adopter-playbook.md
help({topic}) — the language surface, reachable from your agent over MCP (ops, frontmatter, connectors, lint-codes, error-handling).

Skillscript — What's New

Pragmatic, task-oriented notes on each release: what changed, why you'd care, and how to use it. This is the friendly companion to the CHANGELOG — the CHANGELOG is the terse authoritative record (every change + its upgrade impact); these pages are the "here's the feature, here's how you'd actually use it" walkthrough.

If you're deciding whether a release matters to you, start here. If you need the exact list of what changed, read the CHANGELOG.

Release notes

Newest first. Each page covers the problem a release solves, the few things you can now do, a copy-paste example, and the gotchas.

0.40.1 — |fallback: works wherever you put it, and the reference is current again — putting |fallback:after another filter suppressed 0.40.0's raise without supplying the fallback value; fixed, along with in's left-hand side and the empty-value predicate. Also: the language reference shipped in the package had been stale since July and is regenerated — if you wrote a not in de-duplication check against it, re-read that section.
0.40.0 — A condition that can't read a field now says so — an unresolved reference inside an if used to evaluate as false, so "the field is missing" and "the field says no" were the same answer; it now raises. Note the direction: not and != conditions used to run their branch on an unreadable field. BREAKING only where a field is genuinely absent at runtime.
0.39.4 — Assigning a list of records no longer breaks it — $set ITEMS = ${records} used to shred a list of objects into text fragments, so a later foreach couldn't read any field; objects were mangled the same way. BREAKING only for bare numeric # Vars: lists, which now hold numbers instead of text.
0.39.3 — "Couldn't tell" no longer means "no" — a store outage stops reading as a negative answer: skillfile delete fails closed (and now detects the $ execute_skill name="…" reference form it used to miss), and composition / lint / promote report "store unreachable" instead of "not found" / "typo" / "no valid signature".
0.39.2 — A silently truncated argument, fixed — a $ dispatch value containing a double-quote (or unquoted whitespace) no longer silently truncates the argument; kwargs are parsed before substitution.
0.39.1 — HTTP MCP connectors recover from a bad moment — a transient network blip during a connector's handshake no longer wedges it until a runtime restart; it recovers on the next call.
0.39.0 — # OnError: is gone (and it never worked) — the inert error-handler header is removed; a skill carrying it now fails to compile with a pointer to else: / (fallback:). BREAKING only if you used it.
0.38.0 — Line-slicing and field-projection filters — tail/head/lines to slice a log without a shell binary; pluck to project a field from a list of records for clean dedup.
0.37.0 — Bounding external work: the right lever — per-leg timeout= + (fallback:) for a partial-tolerant gather, vs. the whole-run # Deadline: cap.
0.36.0 — Autonomous-fire failure supervision — a cron/event run fails; the runtime pushes it to a handler skill instead of leaving it in a trace nobody reads.
0.35.0 — Deadlines & cancellation — bound a whole run in wall-clock time; real cancellation, not race-and-abandon.
0.34.0 — REST-backed connectors + secret hardening — a plain REST API is a first-class connector (no MCP server needed); shell ops no longer leak secrets into child processes.

Feature guides

Deeper how-tos for individual capabilities, independent of the release they shipped in.

Tagging skills (# Tags:) — organize and find skills; group a big skill menu into families.

Where else to look

Language reference — the canonical spec (syntax, ops, semantics): docs/language-reference.md
Adopter playbook — wiring substrates, security boundaries, running as a service: docs/adopter-playbook.md
help({topic}) — the language surface, reachable from your agent over MCP (ops, frontmatter, connectors, lint-codes, error-handling).

Skillscript — What's New

Pragmatic, task-oriented notes on each release: what changed, why you'd care, and how to use it. This is the friendly companion to the CHANGELOG — the CHANGELOG is the terse authoritative record (every change + its upgrade impact); these pages are the "here's the feature, here's how you'd actually use it" walkthrough.

If you're deciding whether a release matters to you, start here. If you need the exact list of what changed, read the CHANGELOG.

Release notes

Newest first. Each page covers the problem a release solves, the few things you can now do, a copy-paste example, and the gotchas.

0.40.1 — |fallback: works wherever you put it, and the reference is current again — putting |fallback:after another filter suppressed 0.40.0's raise without supplying the fallback value; fixed, along with in's left-hand side and the empty-value predicate. Also: the language reference shipped in the package had been stale since July and is regenerated — if you wrote a not in de-duplication check against it, re-read that section.
0.40.0 — A condition that can't read a field now says so — an unresolved reference inside an if used to evaluate as false, so "the field is missing" and "the field says no" were the same answer; it now raises. Note the direction: not and != conditions used to run their branch on an unreadable field. BREAKING only where a field is genuinely absent at runtime.
0.39.4 — Assigning a list of records no longer breaks it — $set ITEMS = ${records} used to shred a list of objects into text fragments, so a later foreach couldn't read any field; objects were mangled the same way. BREAKING only for bare numeric # Vars: lists, which now hold numbers instead of text.
0.39.3 — "Couldn't tell" no longer means "no" — a store outage stops reading as a negative answer: skillfile delete fails closed (and now detects the $ execute_skill name="…" reference form it used to miss), and composition / lint / promote report "store unreachable" instead of "not found" / "typo" / "no valid signature".
0.39.2 — A silently truncated argument, fixed — a $ dispatch value containing a double-quote (or unquoted whitespace) no longer silently truncates the argument; kwargs are parsed before substitution.
0.39.1 — HTTP MCP connectors recover from a bad moment — a transient network blip during a connector's handshake no longer wedges it until a runtime restart; it recovers on the next call.
0.39.0 — # OnError: is gone (and it never worked) — the inert error-handler header is removed; a skill carrying it now fails to compile with a pointer to else: / (fallback:). BREAKING only if you used it.
0.38.0 — Line-slicing and field-projection filters — tail/head/lines to slice a log without a shell binary; pluck to project a field from a list of records for clean dedup.
0.37.0 — Bounding external work: the right lever — per-leg timeout= + (fallback:) for a partial-tolerant gather, vs. the whole-run # Deadline: cap.
0.36.0 — Autonomous-fire failure supervision — a cron/event run fails; the runtime pushes it to a handler skill instead of leaving it in a trace nobody reads.
0.35.0 — Deadlines & cancellation — bound a whole run in wall-clock time; real cancellation, not race-and-abandon.
0.34.0 — REST-backed connectors + secret hardening — a plain REST API is a first-class connector (no MCP server needed); shell ops no longer leak secrets into child processes.

Feature guides

Deeper how-tos for individual capabilities, independent of the release they shipped in.

Tagging skills (# Tags:) — organize and find skills; group a big skill menu into families.

Where else to look

Language reference — the canonical spec (syntax, ops, semantics): docs/language-reference.md
Adopter playbook — wiring substrates, security boundaries, running as a service: docs/adopter-playbook.md
help({topic}) — the language surface, reachable from your agent over MCP (ops, frontmatter, connectors, lint-codes, error-handling).

Skillscript — What's New

Pragmatic, task-oriented notes on each release: what changed, why you'd care, and how to use it. This is the friendly companion to the CHANGELOG — the CHANGELOG is the terse authoritative record (every change + its upgrade impact); these pages are the "here's the feature, here's how you'd actually use it" walkthrough.

If you're deciding whether a release matters to you, start here. If you need the exact list of what changed, read the CHANGELOG.

Release notes

Newest first. Each page covers the problem a release solves, the few things you can now do, a copy-paste example, and the gotchas.

0.40.1 — |fallback: works wherever you put it, and the reference is current again — putting |fallback:after another filter suppressed 0.40.0's raise without supplying the fallback value; fixed, along with in's left-hand side and the empty-value predicate. Also: the language reference shipped in the package had been stale since July and is regenerated — if you wrote a not in de-duplication check against it, re-read that section.
0.40.0 — A condition that can't read a field now says so — an unresolved reference inside an if used to evaluate as false, so "the field is missing" and "the field says no" were the same answer; it now raises. Note the direction: not and != conditions used to run their branch on an unreadable field. BREAKING only where a field is genuinely absent at runtime.
0.39.4 — Assigning a list of records no longer breaks it — $set ITEMS = ${records} used to shred a list of objects into text fragments, so a later foreach couldn't read any field; objects were mangled the same way. BREAKING only for bare numeric # Vars: lists, which now hold numbers instead of text.
0.39.3 — "Couldn't tell" no longer means "no" — a store outage stops reading as a negative answer: skillfile delete fails closed (and now detects the $ execute_skill name="…" reference form it used to miss), and composition / lint / promote report "store unreachable" instead of "not found" / "typo" / "no valid signature".
0.39.2 — A silently truncated argument, fixed — a $ dispatch value containing a double-quote (or unquoted whitespace) no longer silently truncates the argument; kwargs are parsed before substitution.
0.39.1 — HTTP MCP connectors recover from a bad moment — a transient network blip during a connector's handshake no longer wedges it until a runtime restart; it recovers on the next call.
0.39.0 — # OnError: is gone (and it never worked) — the inert error-handler header is removed; a skill carrying it now fails to compile with a pointer to else: / (fallback:). BREAKING only if you used it.
0.38.0 — Line-slicing and field-projection filters — tail/head/lines to slice a log without a shell binary; pluck to project a field from a list of records for clean dedup.
0.37.0 — Bounding external work: the right lever — per-leg timeout= + (fallback:) for a partial-tolerant gather, vs. the whole-run # Deadline: cap.
0.36.0 — Autonomous-fire failure supervision — a cron/event run fails; the runtime pushes it to a handler skill instead of leaving it in a trace nobody reads.
0.35.0 — Deadlines & cancellation — bound a whole run in wall-clock time; real cancellation, not race-and-abandon.
0.34.0 — REST-backed connectors + secret hardening — a plain REST API is a first-class connector (no MCP server needed); shell ops no longer leak secrets into child processes.

Feature guides

Deeper how-tos for individual capabilities, independent of the release they shipped in.

Tagging skills (# Tags:) — organize and find skills; group a big skill menu into families.

Where else to look

Language reference — the canonical spec (syntax, ops, semantics): docs/language-reference.md
Adopter playbook — wiring substrates, security boundaries, running as a service: docs/adopter-playbook.md
help({topic}) — the language surface, reachable from your agent over MCP (ops, frontmatter, connectors, lint-codes, error-handling).

Skillscript — What's New

Pragmatic, task-oriented notes on each release: what changed, why you'd care, and how to use it. This is the friendly companion to the CHANGELOG — the CHANGELOG is the terse authoritative record (every change + its upgrade impact); these pages are the "here's the feature, here's how you'd actually use it" walkthrough.

If you're deciding whether a release matters to you, start here. If you need the exact list of what changed, read the CHANGELOG.

Release notes

Newest first. Each page covers the problem a release solves, the few things you can now do, a copy-paste example, and the gotchas.

0.40.1 — |fallback: works wherever you put it, and the reference is current again — putting |fallback:after another filter suppressed 0.40.0's raise without supplying the fallback value; fixed, along with in's left-hand side and the empty-value predicate. Also: the language reference shipped in the package had been stale since July and is regenerated — if you wrote a not in de-duplication check against it, re-read that section.
0.40.0 — A condition that can't read a field now says so — an unresolved reference inside an if used to evaluate as false, so "the field is missing" and "the field says no" were the same answer; it now raises. Note the direction: not and != conditions used to run their branch on an unreadable field. BREAKING only where a field is genuinely absent at runtime.
0.39.4 — Assigning a list of records no longer breaks it — $set ITEMS = ${records} used to shred a list of objects into text fragments, so a later foreach couldn't read any field; objects were mangled the same way. BREAKING only for bare numeric # Vars: lists, which now hold numbers instead of text.
0.39.3 — "Couldn't tell" no longer means "no" — a store outage stops reading as a negative answer: skillfile delete fails closed (and now detects the $ execute_skill name="…" reference form it used to miss), and composition / lint / promote report "store unreachable" instead of "not found" / "typo" / "no valid signature".
0.39.2 — A silently truncated argument, fixed — a $ dispatch value containing a double-quote (or unquoted whitespace) no longer silently truncates the argument; kwargs are parsed before substitution.
0.39.1 — HTTP MCP connectors recover from a bad moment — a transient network blip during a connector's handshake no longer wedges it until a runtime restart; it recovers on the next call.
0.39.0 — # OnError: is gone (and it never worked) — the inert error-handler header is removed; a skill carrying it now fails to compile with a pointer to else: / (fallback:). BREAKING only if you used it.
0.38.0 — Line-slicing and field-projection filters — tail/head/lines to slice a log without a shell binary; pluck to project a field from a list of records for clean dedup.
0.37.0 — Bounding external work: the right lever — per-leg timeout= + (fallback:) for a partial-tolerant gather, vs. the whole-run # Deadline: cap.
0.36.0 — Autonomous-fire failure supervision — a cron/event run fails; the runtime pushes it to a handler skill instead of leaving it in a trace nobody reads.
0.35.0 — Deadlines & cancellation — bound a whole run in wall-clock time; real cancellation, not race-and-abandon.
0.34.0 — REST-backed connectors + secret hardening — a plain REST API is a first-class connector (no MCP server needed); shell ops no longer leak secrets into child processes.

Feature guides

Deeper how-tos for individual capabilities, independent of the release they shipped in.

Tagging skills (# Tags:) — organize and find skills; group a big skill menu into families.

Where else to look

Language reference — the canonical spec (syntax, ops, semantics): docs/language-reference.md
Adopter playbook — wiring substrates, security boundaries, running as a service: docs/adopter-playbook.md
help({topic}) — the language surface, reachable from your agent over MCP (ops, frontmatter, connectors, lint-codes, error-handling).

Skillscript — What's New

Pragmatic, task-oriented notes on each release: what changed, why you'd care, and how to use it. This is the friendly companion to the CHANGELOG — the CHANGELOG is the terse authoritative record (every change + its upgrade impact); these pages are the "here's the feature, here's how you'd actually use it" walkthrough.

If you're deciding whether a release matters to you, start here. If you need the exact list of what changed, read the CHANGELOG.

Release notes

Newest first. Each page covers the problem a release solves, the few things you can now do, a copy-paste example, and the gotchas.

0.40.1 — |fallback: works wherever you put it, and the reference is current again — putting |fallback:after another filter suppressed 0.40.0's raise without supplying the fallback value; fixed, along with in's left-hand side and the empty-value predicate. Also: the language reference shipped in the package had been stale since July and is regenerated — if you wrote a not in de-duplication check against it, re-read that section.
0.40.0 — A condition that can't read a field now says so — an unresolved reference inside an if used to evaluate as false, so "the field is missing" and "the field says no" were the same answer; it now raises. Note the direction: not and != conditions used to run their branch on an unreadable field. BREAKING only where a field is genuinely absent at runtime.
0.39.4 — Assigning a list of records no longer breaks it — $set ITEMS = ${records} used to shred a list of objects into text fragments, so a later foreach couldn't read any field; objects were mangled the same way. BREAKING only for bare numeric # Vars: lists, which now hold numbers instead of text.
0.39.3 — "Couldn't tell" no longer means "no" — a store outage stops reading as a negative answer: skillfile delete fails closed (and now detects the $ execute_skill name="…" reference form it used to miss), and composition / lint / promote report "store unreachable" instead of "not found" / "typo" / "no valid signature".
0.39.2 — A silently truncated argument, fixed — a $ dispatch value containing a double-quote (or unquoted whitespace) no longer silently truncates the argument; kwargs are parsed before substitution.
0.39.1 — HTTP MCP connectors recover from a bad moment — a transient network blip during a connector's handshake no longer wedges it until a runtime restart; it recovers on the next call.
0.39.0 — # OnError: is gone (and it never worked) — the inert error-handler header is removed; a skill carrying it now fails to compile with a pointer to else: / (fallback:). BREAKING only if you used it.
0.38.0 — Line-slicing and field-projection filters — tail/head/lines to slice a log without a shell binary; pluck to project a field from a list of records for clean dedup.
0.37.0 — Bounding external work: the right lever — per-leg timeout= + (fallback:) for a partial-tolerant gather, vs. the whole-run # Deadline: cap.
0.36.0 — Autonomous-fire failure supervision — a cron/event run fails; the runtime pushes it to a handler skill instead of leaving it in a trace nobody reads.
0.35.0 — Deadlines & cancellation — bound a whole run in wall-clock time; real cancellation, not race-and-abandon.
0.34.0 — REST-backed connectors + secret hardening — a plain REST API is a first-class connector (no MCP server needed); shell ops no longer leak secrets into child processes.

Feature guides

Deeper how-tos for individual capabilities, independent of the release they shipped in.

Tagging skills (# Tags:) — organize and find skills; group a big skill menu into families.

Where else to look

Language reference — the canonical spec (syntax, ops, semantics): docs/language-reference.md
Adopter playbook — wiring substrates, security boundaries, running as a service: docs/adopter-playbook.md
help({topic}) — the language surface, reachable from your agent over MCP (ops, frontmatter, connectors, lint-codes, error-handling).

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